Almond, Judge.
This is an appeal from the decision of the Patent Office Board of Patent Interferences awarding priority to appellees, Vincent J. Frilette and Paul B. Weisz (Frilette), the junior party. Appellant, Parker, is involved on application serial Ho. 741,906 ñled June 13,1958, which is assigned to Esso Research and Engineering Company. The five counts in issue are modified forms of claims copied by Parker from Frilette patent Ho. 3,140,322, which issued July 7,1964 on an application filed August 14,1958. The Frilette patent is assigned to Mobil Oil Corporation. The issues here are the sufficiency of each party’s proofs concerning reduction to practice.
The invention involved relates to a process for selectively conducting' an organic chemical reaction (i.e., selective catalytic hydrocarbon conversion) by employing a solid crystalline zeolite (i.e., a molecular sieve) containing an added catalyst and having uniform interstitial (i.e., intra-crystalline) dimensions of sufficient size to allow the passage into or out of the pores of the zeolite of only certain molecules having-a particular shape or size. The parties have termed these characteristics as “reactant selectivity” and “product selectivity.” That is, the molecular sieve produces selectivity by a molecular filter action which prevents some feed molecules from coming into contact with the added catalyst (reactant selectivity) and/or prevents some products produced by the added catalyst from leaving the internal pore structure (product selectivity).
The parties have dealt with the issues relative to counts 6-8 as separate from the issues relative to counts 9 and 10, and we shall do-likewise. We reproduce counts 6 and 9 as illustrative of the respective sets of counts:
6. A process for selectively conducting an organic chemical reaction which comprises carrying out a reaction involving contact of at least two molecular species of differing shape with a crystalline aluminosilicate zeolite molecular sieve material, bearing within the interior thereof an added catalyst, introduced [1313]*1313into the zeolite subsequent to formation thereof, and active in affecting conversion of at least one of said species contained within the pores of said zeolite, which zeolite has uniform interstitial dimensions sufficiently large to afford the release from said pores of the product of said conversion but sufficiently small to exclude from said product molecular species of larger size, effecting catalytic conversion of at least one of said species contained within the pores of said zeolite to a material chemically distinct therefrom and of a molecular shape capable of passing from the interior of said zeolite and simultaneously withdrawing, the product so obtained from the resultant effluent stream.
9. A process for selectively conducting an organic chemical reaction which comprises passing a charge capable of conversion into products of different molecular sizes over a crystalline aluminosilicate zeolite molecular sieve material having uniform interstitial dimensions sufficiently large to release conversion products of lesser molecular weight but sufficiently small to prevent release of larger products of conversion and bearing within the interior thereof an added catalyst, active in promoting said reaction, introduced into the zeolite subsequent to formation thereof, effecting catalytic conversion of the charge material admitted to contact with said catalyst within the interior of said zeolite to convert the same to at least one chemical species distinct from said charge and of a molecular size capable of passing from the interior of said zeolite and simultaneously withdrawing, said chemical species from the effluent stream passed over said zeolite.
I. Fmlette's Asserted Reduction to Practice of Subject Matter Within Counts 6-8
Tlie board awarded priority to Frilette as to counts 6-8 on the basis of certain laboratory work performed in January, February, and March of 1958 by Golden and Esgro. This work, designated as the “DC runs,” employed a molecular sieve material known as Linde 5A, which is manufactured by the Linde Division of the Union Carbide Corporation. This material was produced by replacing sodium ions in a Linde 4A molecular sieve with calcium ions, thereby effecting an increase in the uniform port diameter from about four angstroms to about five angstroms.
Parker attacks Frilette’s proof of actual reduction to practice for the following reasons: (a) at the time of the runs, the Linde 5A sieves were not know to contain an added catalyst; (b) there is no competent evidence with respect to the catalyst used; (c) proof of the feed stock used is inadequate; (cl) appellee’s failure to produce original data sheets abridged appellant’s right of cross-examination; (e) testimony concerning the runs is inconsistent; (f) there was no conviction of success relative to the runs; (g) certain corroborating evidence is hearsay; and (h) the work was limited to the intrinsic activity of zeolites, not activity induced by an added catalyst.
Despite similar arguments before the board, priority was awarded to Frilette on the ground that the work of Golden and Esgro shows reduction to practice of counts 6-8. After a thorough review of the [1314]*1314record and the briefs and arguments of counsel, we find no reversible error in the decision of the board. We will not discuss in detail each point raised by appellant; rather, vve think it sufficient to quote from the board’s decision, with which we agree:
* * we are satisfied that the zeolitie material listed as 5A by Golden in his laboratory record responds to the counts. We find no better identification of the zeolitie material employed by Parker in the Parker record.
* * * We are also satisfied that the charge stocks used by Golden were properly identified. Golden testified concerning his use of “120-160 Mi'd Cont Cut (98 O.N.)” * * ®. As to the work of Esgro with Golden, we regard Esgro as another pair of hands for Golden. Golden supplied him with the charge stocks and catalysts. Esgro carried out the work and reported back to Golden, who kept the records. Prater * * * testified that Esgro was a competent laboratory assistant, Weisz * * *, that he was a reliable employee. Both testified that he carried out a supervisor’s instructions to the minute detail.
* * * We are satisfied that the analytical results of Golden Exhibits 3-27 are adequately proven by the testimony of Montgomery who was group leader of the low molecular weight mass spectrometry. The rule of reason normally is followed in applying the hearsay rule. Eurwits v. Poon, 53 CCPA 1502, 364 F.2d 878,150 USPQ 676.
* * * While Parker states that Erilette et al. had no conviction of success as to the work of Golden and Esgro, we feel that the presentation of the data of page 697553 of Golden Exhibit 1 to the Catalyst Group Meeting of April 22, 1958 * * * and the statement therein that:
The selective cracking of n-hexane is clearly .seen.
as well as the similar statement on page 697553 provide evidence of such conviction.
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Almond, Judge.
This is an appeal from the decision of the Patent Office Board of Patent Interferences awarding priority to appellees, Vincent J. Frilette and Paul B. Weisz (Frilette), the junior party. Appellant, Parker, is involved on application serial Ho. 741,906 ñled June 13,1958, which is assigned to Esso Research and Engineering Company. The five counts in issue are modified forms of claims copied by Parker from Frilette patent Ho. 3,140,322, which issued July 7,1964 on an application filed August 14,1958. The Frilette patent is assigned to Mobil Oil Corporation. The issues here are the sufficiency of each party’s proofs concerning reduction to practice.
The invention involved relates to a process for selectively conducting' an organic chemical reaction (i.e., selective catalytic hydrocarbon conversion) by employing a solid crystalline zeolite (i.e., a molecular sieve) containing an added catalyst and having uniform interstitial (i.e., intra-crystalline) dimensions of sufficient size to allow the passage into or out of the pores of the zeolite of only certain molecules having-a particular shape or size. The parties have termed these characteristics as “reactant selectivity” and “product selectivity.” That is, the molecular sieve produces selectivity by a molecular filter action which prevents some feed molecules from coming into contact with the added catalyst (reactant selectivity) and/or prevents some products produced by the added catalyst from leaving the internal pore structure (product selectivity).
The parties have dealt with the issues relative to counts 6-8 as separate from the issues relative to counts 9 and 10, and we shall do-likewise. We reproduce counts 6 and 9 as illustrative of the respective sets of counts:
6. A process for selectively conducting an organic chemical reaction which comprises carrying out a reaction involving contact of at least two molecular species of differing shape with a crystalline aluminosilicate zeolite molecular sieve material, bearing within the interior thereof an added catalyst, introduced [1313]*1313into the zeolite subsequent to formation thereof, and active in affecting conversion of at least one of said species contained within the pores of said zeolite, which zeolite has uniform interstitial dimensions sufficiently large to afford the release from said pores of the product of said conversion but sufficiently small to exclude from said product molecular species of larger size, effecting catalytic conversion of at least one of said species contained within the pores of said zeolite to a material chemically distinct therefrom and of a molecular shape capable of passing from the interior of said zeolite and simultaneously withdrawing, the product so obtained from the resultant effluent stream.
9. A process for selectively conducting an organic chemical reaction which comprises passing a charge capable of conversion into products of different molecular sizes over a crystalline aluminosilicate zeolite molecular sieve material having uniform interstitial dimensions sufficiently large to release conversion products of lesser molecular weight but sufficiently small to prevent release of larger products of conversion and bearing within the interior thereof an added catalyst, active in promoting said reaction, introduced into the zeolite subsequent to formation thereof, effecting catalytic conversion of the charge material admitted to contact with said catalyst within the interior of said zeolite to convert the same to at least one chemical species distinct from said charge and of a molecular size capable of passing from the interior of said zeolite and simultaneously withdrawing, said chemical species from the effluent stream passed over said zeolite.
I. Fmlette's Asserted Reduction to Practice of Subject Matter Within Counts 6-8
Tlie board awarded priority to Frilette as to counts 6-8 on the basis of certain laboratory work performed in January, February, and March of 1958 by Golden and Esgro. This work, designated as the “DC runs,” employed a molecular sieve material known as Linde 5A, which is manufactured by the Linde Division of the Union Carbide Corporation. This material was produced by replacing sodium ions in a Linde 4A molecular sieve with calcium ions, thereby effecting an increase in the uniform port diameter from about four angstroms to about five angstroms.
Parker attacks Frilette’s proof of actual reduction to practice for the following reasons: (a) at the time of the runs, the Linde 5A sieves were not know to contain an added catalyst; (b) there is no competent evidence with respect to the catalyst used; (c) proof of the feed stock used is inadequate; (cl) appellee’s failure to produce original data sheets abridged appellant’s right of cross-examination; (e) testimony concerning the runs is inconsistent; (f) there was no conviction of success relative to the runs; (g) certain corroborating evidence is hearsay; and (h) the work was limited to the intrinsic activity of zeolites, not activity induced by an added catalyst.
Despite similar arguments before the board, priority was awarded to Frilette on the ground that the work of Golden and Esgro shows reduction to practice of counts 6-8. After a thorough review of the [1314]*1314record and the briefs and arguments of counsel, we find no reversible error in the decision of the board. We will not discuss in detail each point raised by appellant; rather, vve think it sufficient to quote from the board’s decision, with which we agree:
* * we are satisfied that the zeolitie material listed as 5A by Golden in his laboratory record responds to the counts. We find no better identification of the zeolitie material employed by Parker in the Parker record.
* * * We are also satisfied that the charge stocks used by Golden were properly identified. Golden testified concerning his use of “120-160 Mi'd Cont Cut (98 O.N.)” * * ®. As to the work of Esgro with Golden, we regard Esgro as another pair of hands for Golden. Golden supplied him with the charge stocks and catalysts. Esgro carried out the work and reported back to Golden, who kept the records. Prater * * * testified that Esgro was a competent laboratory assistant, Weisz * * *, that he was a reliable employee. Both testified that he carried out a supervisor’s instructions to the minute detail.
* * * We are satisfied that the analytical results of Golden Exhibits 3-27 are adequately proven by the testimony of Montgomery who was group leader of the low molecular weight mass spectrometry. The rule of reason normally is followed in applying the hearsay rule. Eurwits v. Poon, 53 CCPA 1502, 364 F.2d 878,150 USPQ 676.
* * * While Parker states that Erilette et al. had no conviction of success as to the work of Golden and Esgro, we feel that the presentation of the data of page 697553 of Golden Exhibit 1 to the Catalyst Group Meeting of April 22, 1958 * * * and the statement therein that:
The selective cracking of n-hexane is clearly .seen.
as well as the similar statement on page 697553 provide evidence of such conviction.
In addition to wliat the board said, we think it necessary to add some comments relative to what appears to be appellant’s main contention— that the Linde 5A zeolites used in the runs were not “known” or “shown” to contain an “added catalyst” which was effective as such. Appellant contends that the runs really showed only intrinsic catalytic activity of the 5A material and seems to take the view that the tests could constitute a reduction to practice only if it was known that the calcium in the 5A zeolites performed as a catalyst extrinsic to the zeolite and the results of the runs demonstrated that the calcium acted effectively as such an extrinsic catalyst.
The trouble with that contention is that appellant’s own application, on which he must rely for suport of the counts, does not establish any recognition of the intrinsic-extrinsic theory. He is in no position, therefore, to impose such a restriction on Frilette’s proofs. See Blicke v. Treves, 44 CCPA 753, 241 F.2d 718, 112 USPQ 472 (1957).
The counts in issue are broad enough to cover use of Linde 5A zeolite catalysts formed by exchange of sodium ions with a metal, such as calcium, wherein the exchanged ion acts as an added catalyst effect[1315]*1315ing conversion as defined. The reference to added catalysts is unambiguous, and it is clear that the DC runs involved the use of such a catalyst. It seems to be conceded that it is now known that the calcium ions in the Linde 5A zeolite in fact function as an added catalyst resulting in the selective catalytic conversion claimed. Since Frilette achieved selective catalytic conversion, and recognized the fact that selectivity was achieved, using a molecular sieve which is encompassed by the unambiguous counts in issue, the proof of reduction to practice is sufficient. There is no need for Frilette to prove contemporaneous recognition of the fact that selectivity was achieved through the mechanism of the calcium acting as an added catalyst inducing activity extrinsic of the zeolite since Parker also failed to recognize that fact. An. inventor need not understand precisely why his invention works in order to achieve an actual reduction to practice.
II. Frilette1 s Asserted Reduction to Practice of Subject Matter Within Counts 9 and 10
The board awarded priority to Frilette as to counts 9 and 10 on the basis of “Experiment No. 59” performed by Mower, which employed a molecular sieve produced by treating a Linde 5 A (calcium-containing) sieve with dilute ammonium nitrate, drying, and calcining to introduce catalytically active acidity to replace the calcium. Experiment 59 was carried out by Mower on November 19, 1956 and involved passing n-hexane at a temperature of 875° F. over the ion-exchanged 5A molecular sieve. The product contained the following components in the specified mole percent: hydrogen — 3%; ethylene — 9.6%; ethane— 13.8%; propene — 29.4%; propane — 25.5%; isobutane — 2.7%; bu-tenes — -9.7%; n-butane — 1.8%; isopentane — 3.6%; other — -0.9%.
Parker also attack’s Frilette’s proof of reduction to practice as to these counts for a number of reasons. It is his position that (a) the results do not show sufficient selectivity to count as a reduction to practice, (b) the results should have been compared, with a thermal control run, (c) there was no contemporaneous conviction of success relative to the experiment, (d) the proof of the sieve used is insufficient, and (e) there is no proof that the ion-exchange and calcination did not destroy the crystallinity of the molecular sieve.
Again we must express our agreement- with the board that:
* * * the evidence * * * shows reduction to practice for Frilette et al. of the invention of counts 9 and 10 hy January 8, 1957. The evidence in the record for Frilette et al. shows selectivity. While Parker compares Experiment 59 performed by Blower with Example 8 of the Frilette et al. patent, we think it would be unrealistic to require complete elimination of the iso hydrocarbons in order to -consider Experiment 59 as a reduction to practice. O. Clark Exhibit 9 shows that iso [1316]*1316hydrocarbons obtained were decreased over what was obtained with a conventional catalyst.
* * * We think that the source of the 5A pellets used by Mower * * * has been sufficiently proved. Since this material was a staple, we see no necessity for estab: lishing its crystallinity, uniform interstitial dimensions and other characteristics as urged by Parker. Nor has it been adequately shown by Parker that the conditions to which it was subjected in the Frilette et al. experiments would destroy these characteristics.
* * * We find in the Frilette et al. record that Frilette did have a conviction of success from the hexane cracking by Mower. Frilette’s statements in regard to further exploration or further pursuit of details of information do not negate this work as reduction to practice. Rimbaeh v. Wanmaker, 53 OCPA 1552, 362 F.2d 561, 150 USPQ 302. The fact that Frilette presented the data of Mower Exhibit 3 to the Catalyst Research Group shows his support of the results obtained. Thus, page MF-p-1 states:
The activated preparation was found to have considerable cracking activity for Co normal hydrocarbons,...
* * * As to Parker’s complaint that he was not permitted to cross-examine Frilette and Mower as to parts of their notebooks not introduced into evidence • * *, we agree with Frilette et al. that this was beyond the scope of the direct examination.
It appears that Parker is particularly disturbed by the 'board’s comparison of the results of Experiment 59 with a conventional catalyst in order to show that selectivity was achieved, and its refusal to compare the results with example 8 of the Frilette patent, said example showing selectivity to the extent that no iso-hydrocarbons whatsoever were produced. While there is no doubt that example 8 shows the ide'al-' in regard to selectivity, this does not mean that the results of Experiment 59, wherein 6.3 mole percent of iso-hydrocarbons was found, do not also show selectivity. The testimony indicates that both Drs. Fri-lette and Weisz were convinced, despite the presence of some production of iso-hydrocarbons, that selectivity had indeed been achieved.
We also think it necessary, because of the position taken by the dissent, to briefly discuss a point which otherwise we would not, the board having adequately dealt with the issue. Appellant contends that the claimed crystallinity and uniformity of interstitial dimensions can be destroyed at a pH below 4 and/or a temperature above 1000° F., and that these characteristics might have been destroyed in Experiment No. 59. Both Parker and the dissenters would place the burden on Frilette to show that there has been no loss of crystallinity and uniform interstitial dimensions.
While a party must show reduction to practice of each and every limitation of the counts, we think Frilette has done so here. Frilette’s starting zeolite material in Experiment No. 59 had the requisite characteristics, and it is his position that these properties were not changed during the iomexchange process. Since appellant has [1317]*1317presented no good reason to expect that there had been a change in character, Frilette has met his burden. Appellant is the one arguing that a change might have occurred, and the burden is on him to show reasonable grounds for his belief. The mere raising of the issue does not place a 'burden on Frilette to show that, in fact, the crystallinity and interstitial dimension were not destroyed. Frilette would have that burden only if Parker has shown good reason to believe the alleged change had taken place. See, Brinker v. Kray, Patent Appeal No. 8734, decided June 1, 1972. The board found Parker has not done SO' here, and we must agree. There is no indication whatsoever that the-, experiment in question was performed at a pH below 4 or at a temperature above 1000° F.
III. ParhePs Asserted Reduction to Practice of Subject Matter Within Counts 6 — 10
Parker’s record in this interference is essentially identical to his record in a previous interference, No. 93,040, between the same parties. The sole count of that interference was as follows:
A .process for selectively cracking normal paraffins to olefins wliieli paraffins are contained in a hydrocarbon oil which comprises contacting the oil at a cracking temperature in the range of from 800 to 1100° F. with a crystalline metallic alumino-silicate having a uniform pore size of about 5A° in a contacting zone and withdrawing from said zone an oil having a reduced normal paraffin content and an increased olefin content.
Both parties attempted to prove actual reduction to practice of subject matter within' the count, but the board,found both parties’ proofs wanting and awarded priority to Parker on the basis of his filing date. Frilette did not appeal. There, as here, Parker relied on a certain “Run #255,” and the board’s discussion thereof was as follows:
Frilette attacks Parker’s contention that this testimony proves reduction to practice by pointing out that the only evidence as to the feed material used in run 255 is the secondary evidence contained in Parker Exhibit 18 and Arey Exhibit 4; that the original sources have not been established or authenticated except possibly with respect to the products of the run; and that there is no testimony as to how the data of Exhibit 18 were derived.
We agree with Frilette’s position that this testimony on Parker’s behalf is inadequate to prove that he reduced the invention to practice in this experimental work and ensuing analysis. Parker has presented a lengthy and comprehensive record as to the persons involved in this work and the procedures employed, but we find this record to be significantly lacking in proof of the aspect most particularly necessary to support his contention that the invention was reduced to practice. The conclusion was drawn on page 8 of Parker Exhibit 18 (dated March 5, 1957) that there was an “indication that 5A sieve appears to crack the normal hexane to a greater extent than the C0 isoparaffins and naphthenes,” but we find in this entire record no basis on which this Board can adopt that conclusion as its own. Parker himself did [1318]*1318not testify, and no witness on his behalf testified as to how the conclusion could be reached on the basis of the large mass of data and many miscellaneous bits of information presented. Parker has not provided such interpretation in his brief although challenged by Frilette to do so. While the documentary evidence submitted might lead to a surmise that this conclusion was correct, no witness was produced to provide the necessary connectives or support for’ the documentation, or to submit himself to essential cross examination We hold accordingly that Parker has not proved his contention as to reduction to practice.
; .In the present .interference, the board panel (consisting of one of the same members and two members who had not been on the former panel) again examined Parker’s record with respect to Run #255, saying
S, Melton testified relative to Run #255, a cracking experiment conducted by him on December 28, 1956 and recorded by him in Exhibits 2B, 20 and 2D. Melton stated that the Feed stock (identified as #914 on Exhibit 2B) was “supplied to us by the technical people;” the catalyst was “5A Sieve,” which information was supplied by Parker, “the technical man on the unit” (P. 36) ,and- that the gas and liquid products of the run were sent for analysis.
■ :7: 'Melun, the head of the'business group at the Esso laboratory, gave the only testimony as to' Parker Exhibit 18, Technical Committee Report on Studies on Light Naphtha Improvement, dated March 5, 1957. Melun’s relation to this report was that this report was a formal progress report contained in the files under his supervision (P. 273, 274). The party Parker in his brief relies on Tables A-II and A-III of this exhibit, said on the exhibit to show “Thermal and Catalytic Cracking of Aramco C8 Naphtha Liquid Product Distribution” (Table A-III). The inventor Parker did not testify as to this exhibit nor did any of the scientific personnel at Esso.
8. There is no analysis in the Parker record of the feed-employed in Run 255 except for figures given in Table A-III of Parker Exhibit 18.
The board then discussed three arguments made by Parker to distinguish the present interference from the former, No. 93,040, but concluded that the same issue was present (namely, the composition of the feed stock in Run #255) and that Parker still had not proved an actual reduction to practice. Frilette points out in his brief: ■
The decision in Interference No. 93,040 cited deficiencies in the Parker record arid if these deficiencies could have been overcome by producing additional evidence in this interference instead of relying on the identical record as that in Interference No. 93,040, it would seem apparent that Parker would have taken further testimony for this purpose.
■ On this appeal, Parker relies on a comparison between his Exhibit 12, which was properly authenticated and corroborated, and his Exhibit 18, which was not, to establish the composition of the feed stock for Run #255 set forth in Exhibit 18, that being the critical question. He notes that the composition of the product of Run #255 [1319]*1319.as'set forth, in his Exhibit 18, as to seven separate ingredient's, agrees precisely with the composition of the product of Bun #255 as.set forth in his Exhibit 12, and he argues that this establishes the accuracy of the composition of the feed stock “No. 914” for Bun #255, also set forth in his Exhibit 18 but not set forth in his Exhibit 12. He says:
It is inconceivable that the identical product analysis involving some seven components could be produced from a feed other than that shown in Parker Exhibit 18 or in a rim other than Run 255. [Emphasis ours.]
Parker also cites Hurwitz v. Poon, 53 CCPA 1502, 364 F.2d 818, 150 USPQ 676 (1966), for the proposition that “the rule of reason should be followed in applying the hearsay rule” in interferences and argues that Parker Exhibit 18 should be accepted as adequate proof of the composition of the feed stock for Bun #255 because it was “a formal printed technical report of the Esso Besearch and Engineering Company [prepared ante litem motam\ for purposes of wide circulation within that company.”
As the board observed in its opinion in the previous interference, “a common sense view must be taken of questions of this nature and not a hypertechnical one.” However, such a “common sense view” does not relieve a party to an interference who is attempting to prove an actual reduction to practice prior to his filing date of his burden of proving that reduction to practice as to all count limitations. Parker Exhibit 12, though authenticated and corroborated, proves nothing at all with respect to the feed stock of Bun #255; it is relevant only to the product of that run, and we cannot see how the correlation between the composition of the product as set forth in Parker Exhibits 12 and 18 proves the accuracy of the composition of the feed stock set forth in Parker Exhibit 18 only. It is true there is perfect correlation between Exhibits 12 and 18 as to the product, which would seem to show, as appellant argues, that both documents must relate to the same run so as to enable the analysis of the feed in Exhibit 18 to be read into Exhibit 12. The trouble with this argument is that Exhibit 18 is itself insufficiently authenticated as to the composition of the feed set forth in Tables A-I and A-III thereof.
We think Parker is trying to read more into Humoitz v. Poon, supra, than was intended. The trouble with Parker’s evidence with respect to his Exhibit 18 is that Frilette had no way to go behind the bald figures therein. The exhibit was identified only by the custodian thereof, a person unqualified to testify concerning the contents of the report. As both panels of the Board of Patent Interferences which reviewed this evidence remarked, neither the inventor Parker nor any [1320]*1320other of Esso’s scientific personnel testified concerning this exhibit, nor has Parker explained the absence of such testimony in any way. This is thus a case utterly unlike Anderson v. Pieper, 58 CCPA 1221, 412 F. 2d 982, 169 USPQ 788 (1971), in which the “rule of reason” was relied on to relieve the appellants of the necessity of offering further corroboration of the notebook entries of a deceased colleague of the inventors.
For the foregoing reasons, we see no error in the board’s determination that Parker failed to prove actual reduction to practice prior to his filing date of subject matter within counts 6-10.
Accordingly, the decision of the board is affirmed.