SMITH, Judge.
On May 9, 1958, appellants filed application serial No. 734,106 for a patent on “Production of Viral Interfering Substances.” On this appeal they urge error in the board’s decision, adhered to on reconsideration, sustaining the examiner’s rejection of all the claims in that application.
The claims, 1-19, define a process and a product produced by the process. Claims 1 and 18 are illustrative and read:
1. A process for the production of a viral interfering substance which comprises incubating in a material selected from the group consisting of living animal cells and tissue in an aqueous medium in the presence of oxygen a virus inactivated until it has lost its power of reproduction but still having viral interfering activity and thereafter separating the aqueous medium con[888]*888taining the viral interfering substance from the material.
18. A viral interfering substance produced by the process of claim 1.
When the claims are read in light of the disclosure, it is apparent that appellants have discovered that the known “viral interference” phenomenon, i. e., the fact that an attenuated virus will inhibit a live virus, involves an intermediary substance distinct from either virus. Appellants term this material “viral interfering substance,” or “Interferon.” As they point out in the specification :
Viral interference is a phenomenon in which one virus interferes with the growth of a second virus in living tissues or cells. This interference is not an immunological effect and may occur when the interfering virus is non-infective.
We have found that during the induction of a viral interference by non-infective virus, a viral interfering substance distinct from the non-infective virus is produced. The viral interfering substance, which we call Interferon, is formed by the interaction of inactivated virus and living cells, and its activity may be recognized by its ability to inhibit the growth of living viruses.
It seems quite clear that this is a pioneer field, for the Patent Office applied no prior art in rejecting the claims. Perhaps it is for this reason, the fact that the invention lies in relatively virgin territory, that it has been so difficult for us to ascertain the precise grounds relied upon by the Patent Office to support its rejections. After much study of the record, we have determined that the rejections are based on 35 U.S.C. § 101 and 35 U.S.C. § 112. In particular, there is a rejection of all claims for failure to prove utility, under section 101; a rejection of all claims for failure to disclose how to make and use the invention, under section 112; and a rejection of all claims on the ground that they fail to define the invention with the particularity and distinctness required by section 112. We shall consider these rejections separately, in the order stated:
I. Section 101: Proof of Utility
The solicitor treats this case as one wherein the objection was directed to failure to prove any asserted utility, rather than one in which the objection was on the ground that none of the asserted utilities would satisfy section 101 even if proved. This seems at first glance a fair appraisal of the Patent Office’s position here, but it is enlightening to consider the various ways in which the section 101 rejection was expressed during the prosecution of the application. Thus, in his letter of November 18, 1958, the examiner stated:
The claims are further rejected for lack of demonstrated utility in the absence of a showing that the compositions are safe, effective and reliable for their intended purpose.
Such language, of course, calls to mind the familiar problem of “human utility,” with which this court has had to deal many times. See, e. g., In re Hartop, 311 F.2d 249, 50 CCPA 780; In re Krimmel, 292 F.2d 948, 48 CCPA 1116. In his next letter, on January 12, 1960, the examiner stated:
The claims are further rejected for lack of demonstrated utility in the absence of any showing that the composition is safe, effective and reliable for its intended purpose. Merely stating that it interferes with the growth of a few viruses is not considered a sufficient demonstration of utility particularly since there is no indication of how such experiments were performed, amount of material used or the like.
This passage seems to indicate a subtle shift of position. But it is not clear whether the examiner simply did not believe that the composition would interfere “with the growth of a few viruses,” or whether he was concerned with the sufficiency of the disclosure of how to use the compound under 35 U.S.C. § 112.
[889]*889In response to the letter of January-12, 1960, the attorney for appellants entered an amendment and remarked:
On the matter of utility, there is ample showing already of record and applicants have not merely stated that Interferon interferes with the growth of a few viruses, as they have gone much further as carefully explained in the record. Nevertheless, applicants will endeavor to meet any reasonable requirement and, for this purpose, it is respectfully requested that the Examiner issue an advisory action based upon the amendments and the foregoing discussion.
Responding to the above request in a letter of July 12, 1960, the examiner stated:
The claims stand rejected for lack of demonstrated utility for the reasons fully set forth in the final rejection * * * of Jan. 12, 1960. * * *
The next statement pertinent to the question of section 101 utility appears in the examiner’s answer of May 8,1961:
The claims are further rejected for lack of demonstrated utility. No evidence of record shows that the Interferon has been utilized in vivo in any animal, human or otherwise. The tests noted by applicants in the brief, pages 7 and 8 are in vitro tests. It is well settled that in this art the two types of tests do not necessarily compare. * * * [0]b-viously the average physician is not going to try a completely untested material nor experiment to determine what might be an effective dosage, and how it might be administered to be most effective. He also would not barter the lives of his patients for the remote possibility that he may prove that this unknown and untested material is or is not effective in the treatment of a particular disease. * * *
This statement is somewhat bewildering. First the examiner indicates that the rejection is for failure to prove an asserted utility. He then goes on to point out that in vivo tests were apparently not made and implies that in vitro utility, however believable, is insufficient for purposes of section 101. He then concludes with statements indicative of a concern both for the problem of “human utility” and the problem of “how to use.”
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SMITH, Judge.
On May 9, 1958, appellants filed application serial No. 734,106 for a patent on “Production of Viral Interfering Substances.” On this appeal they urge error in the board’s decision, adhered to on reconsideration, sustaining the examiner’s rejection of all the claims in that application.
The claims, 1-19, define a process and a product produced by the process. Claims 1 and 18 are illustrative and read:
1. A process for the production of a viral interfering substance which comprises incubating in a material selected from the group consisting of living animal cells and tissue in an aqueous medium in the presence of oxygen a virus inactivated until it has lost its power of reproduction but still having viral interfering activity and thereafter separating the aqueous medium con[888]*888taining the viral interfering substance from the material.
18. A viral interfering substance produced by the process of claim 1.
When the claims are read in light of the disclosure, it is apparent that appellants have discovered that the known “viral interference” phenomenon, i. e., the fact that an attenuated virus will inhibit a live virus, involves an intermediary substance distinct from either virus. Appellants term this material “viral interfering substance,” or “Interferon.” As they point out in the specification :
Viral interference is a phenomenon in which one virus interferes with the growth of a second virus in living tissues or cells. This interference is not an immunological effect and may occur when the interfering virus is non-infective.
We have found that during the induction of a viral interference by non-infective virus, a viral interfering substance distinct from the non-infective virus is produced. The viral interfering substance, which we call Interferon, is formed by the interaction of inactivated virus and living cells, and its activity may be recognized by its ability to inhibit the growth of living viruses.
It seems quite clear that this is a pioneer field, for the Patent Office applied no prior art in rejecting the claims. Perhaps it is for this reason, the fact that the invention lies in relatively virgin territory, that it has been so difficult for us to ascertain the precise grounds relied upon by the Patent Office to support its rejections. After much study of the record, we have determined that the rejections are based on 35 U.S.C. § 101 and 35 U.S.C. § 112. In particular, there is a rejection of all claims for failure to prove utility, under section 101; a rejection of all claims for failure to disclose how to make and use the invention, under section 112; and a rejection of all claims on the ground that they fail to define the invention with the particularity and distinctness required by section 112. We shall consider these rejections separately, in the order stated:
I. Section 101: Proof of Utility
The solicitor treats this case as one wherein the objection was directed to failure to prove any asserted utility, rather than one in which the objection was on the ground that none of the asserted utilities would satisfy section 101 even if proved. This seems at first glance a fair appraisal of the Patent Office’s position here, but it is enlightening to consider the various ways in which the section 101 rejection was expressed during the prosecution of the application. Thus, in his letter of November 18, 1958, the examiner stated:
The claims are further rejected for lack of demonstrated utility in the absence of a showing that the compositions are safe, effective and reliable for their intended purpose.
Such language, of course, calls to mind the familiar problem of “human utility,” with which this court has had to deal many times. See, e. g., In re Hartop, 311 F.2d 249, 50 CCPA 780; In re Krimmel, 292 F.2d 948, 48 CCPA 1116. In his next letter, on January 12, 1960, the examiner stated:
The claims are further rejected for lack of demonstrated utility in the absence of any showing that the composition is safe, effective and reliable for its intended purpose. Merely stating that it interferes with the growth of a few viruses is not considered a sufficient demonstration of utility particularly since there is no indication of how such experiments were performed, amount of material used or the like.
This passage seems to indicate a subtle shift of position. But it is not clear whether the examiner simply did not believe that the composition would interfere “with the growth of a few viruses,” or whether he was concerned with the sufficiency of the disclosure of how to use the compound under 35 U.S.C. § 112.
[889]*889In response to the letter of January-12, 1960, the attorney for appellants entered an amendment and remarked:
On the matter of utility, there is ample showing already of record and applicants have not merely stated that Interferon interferes with the growth of a few viruses, as they have gone much further as carefully explained in the record. Nevertheless, applicants will endeavor to meet any reasonable requirement and, for this purpose, it is respectfully requested that the Examiner issue an advisory action based upon the amendments and the foregoing discussion.
Responding to the above request in a letter of July 12, 1960, the examiner stated:
The claims stand rejected for lack of demonstrated utility for the reasons fully set forth in the final rejection * * * of Jan. 12, 1960. * * *
The next statement pertinent to the question of section 101 utility appears in the examiner’s answer of May 8,1961:
The claims are further rejected for lack of demonstrated utility. No evidence of record shows that the Interferon has been utilized in vivo in any animal, human or otherwise. The tests noted by applicants in the brief, pages 7 and 8 are in vitro tests. It is well settled that in this art the two types of tests do not necessarily compare. * * * [0]b-viously the average physician is not going to try a completely untested material nor experiment to determine what might be an effective dosage, and how it might be administered to be most effective. He also would not barter the lives of his patients for the remote possibility that he may prove that this unknown and untested material is or is not effective in the treatment of a particular disease. * * *
This statement is somewhat bewildering. First the examiner indicates that the rejection is for failure to prove an asserted utility. He then goes on to point out that in vivo tests were apparently not made and implies that in vitro utility, however believable, is insufficient for purposes of section 101. He then concludes with statements indicative of a concern both for the problem of “human utility” and the problem of “how to use.”
The board’s decision unfortunately provides no added insight as to the real basis for the rejection. As stated by the board:
Not only is there lacking in the application a showing of how the invention product or process is to be used, a deficiency under 35 U.S.C. 112, but there is no proof of operativeness or usefulness. As the Examiner states, there is no evidence of in vivo animal or human tests. Certainly no competent evidence is adduced which suggests the Examiner erred in rejecting the claims on the ground that they lacked demonstrated utility. Accordingly, we will also sustain this rejection.
We have tried to rationalize the above statements into a meaningful rejection under section 101. One thing seems clear: both the examiner and the board felt that appellants should have submitted evidence of in vivo tests. No authority has been cited and we have been able to find none which requires that in order to secure a patent, utility of a pharmacologically active substance must be proved by in vivo testing. The mere fact that the claimed invention may have possible utility in vivo does not warrant disregard of in vitro activity where the claims are not limited to in vivo use. See In re Folkers, 344 F.2d 970, 52 CCPA — . Indeed, it is doubtful that the viral interfering activity could have been initially discovered in vivo.
Moreover, in consistently requiring in vivo test data, the Office seems to have implied that appellants’ allegations of success in vitro, while not sufficient un[890]*890der section 101, were at least credible. Certainly it is extremely doubtful that any of the statements quoted above could be reasonably interpreted as a call for in vitro test data. The most relevant portion of appellants’ disclosure states:
The activity of the viral interfering substances may be measured by a biological test and it can be shown in the following way. The substance is mixed with pieces of chick chorioallantoic membrane for 24 hours at 37° C. to allow interference to become established. It is then re- ■ moved and the membrane pieces are incubated with live influenza virus. In such an experiment only a very low yield of virus will result as compared with control pieces of membrane not previously treated with viral interfering substance but similarly incubated with live influenza virus. The yield of virus is conveniently measured by the haemagglutinin titration test.
Nowhere in the record have we been able to find the slightest indication that the examiner or the board disbelieved the foregoing description of in vitro utility, or that they ever called for proof of such utility.
Furthermore, even if there had been a call for in vitro test data, we seriously question the examiner’s discretion to make it. In In re Novak, 306 F.2d 924, 49 CCPA 1283, we said:
In our opinion, when an applicant bases utility for a claimed invention on allegations of the sort made by appellants here, unless one with ordinary skill in the art would accept those allegations as obviously valid and correct, it is proper for the examiner to ask for evidence which substantiates them. * * *
More recently, in In re Citron, 325 F.2d 248, 51 CCPA 852, we had occasion to expound the Novak case, and stated:
We approve the board’s decision affirming the rejection based on section 101 and the rationale that where claimed compounds are alleged in the specification to have a utility of as much public importance as is the effective treatment of cancer, which alleged utility appears to be incredible in the light of the knowledge of the art, or factually misleading, applicant must establish the asserted utility by acceptable proof. •X- * *
It is our opinion that the instant disclosure would satisfy one of ordinary skill in this particular art that the claimed invention possesses the alleged utility. Even more to the point, however, it seems manifestly clear from the record that the alleged utility is not “incredible in the light of the knowledge of the art, or factually misleading.” In such a case, it is clearly improper for the examiner to make a demand for further test data, which as evidence would be essentially redundant and would seem to serve for nothing except perhaps to unduly burden the applicant.
For the foregoing reasons, we hold that appellants have disclosed and claimed an invention which meets the requirements of section 101, i. e., that the invention is “useful.”
II. Section 112: How to Make and Use
The claims were also rejected, in the words of the board, “because appellants’ application does not tell us how this material is to be put to use or even how it is to be prepared or treated to put it into a final useful form for application to a particular subject, animal or vegetable.”
To the contrary, we think appellants’ specification clearly shows how to carry out the process of claims 1-17, to obtain and isolate the product of claims 18 and 19, and further enables one skilled in the art to make use of that product in connection with the asserted in vitro utility. As stated in the specification:
The inactivation of the virus from the infective state to the non-infective state may be carried out in a known manner, for example, by heating or by subjecting it to ultraviolet light. The inactivating treat[891]*891ment is generally such as to abolish or greatly reduce the infectivity of the virus, whilst retaining its interfering activity. Heat treatment at 56° C. for 1 hour is sufficient for this purpose; heating to 60° C. would destroy the interfering activity of the virus.
The procedure for the production of Interferon will generally be to infect the cell material or tissue with the inactivated virus, for example the Melbourne (1935) strain of influenza virus A, by incubating the cell material or tissue for a relatively short time, of the order of one to three or four hours, in a medium containing the virus. The cell material or tissue is then removed from the medium and washed free of it so that the virus is not carried into the fresh medium in which the cell material or tissue is thereafter incubated. In order to obtain good yields of Interferon adequate oxygenation of the cell material or tissue is necessary during incubation, which is carried out in a buffered salt solution, for example Earles’ solution (see R. C. Parker, “Methods of Tissue Culture”, 1950). This incubation is carried out, most advantageously at blood heat, for a relatively longer period, for example overnight, and the Interferon is spontaneously liberated into the medium. With heat-inactivated virus the bulk of the Interferon is liberated between 3 and 12 hours after commencing incubation, but with ultra-violet inactivated virus liberation may continue for 2 or 3 days.
The medium containing the Interferon is then separated from the cell material or tissue and may be treated in various ways to purify and/or concentrate the Interferon. Thus the Interferon may be precipitated from the medium by saturating it with ammonium sulphate. The precipitate may be dissolved in Earle’s buffer solution. Ammonium sulphate carried into the buffer solution may then be removed therefrom by dialysis.
The Interferon in this solution or in the original medium may be purified by dialysis against a buffer solution; Interferon is stable at pH 2 and when so dialysed at this pH some material precipitates leaving Interferon in solution. Interferon is also stable under other pH conditions, and is stable for at least two weeks at 2° C. Unlike pancreatic ribonuclease, it is wholly or partially inactivated at 60° C.
The concentration of the Interferon in solution in the original medium or in a fresh solution after precipitation may be increased by pressure dialysis; through, for example, a Visking cellulose casing at a pressure of 600 mm.Hg.; the volume of the solution may be reduced 50-fold or more by this method, leaving Interferon within the dialysis sac.
Interferon can be distinguished from the original inactivated virus by several properties, namely its inability to agglutinate red blood cells, its resistance to the neutralising action of viral antiserum, and its lower sedimentation rate. It is not measurably sedimented by centrifuging at 100,000 g. for % hour or 20,000 g. for 2 hours, although the same treatment removes all interfering activity from inactivated virus.
We have quoted at some length from appellants’ specification because we think the disclosure contained therein speaks for itself most eloquently regarding the question of how to carry out the claimed process and produce the claimed product. The foregoing, and other equally detailed and comprehensive statements in the specification clearly describe, first in general terms and then by specific example, the preparation of Interferon; and we are more than satisfied that a person skilled in this art would thereby be enabled to use the claimed process to prepare the claimed substance.
[892]*892Referring to the question of how to use Interferon once it is obtained, the board said:
* * * The specification does not inform us (1) what quantities safely may be administered to a subject, human or animal, (2) how this material may be administered, or (3) what the effect of any quantity of this material on a living subject may be. It is not disclosed that when applied in any certain manner to treat any certain, specific virus contained in any certain animal subject the resultant gain or change will make the treatment worth the application.
In view of our holding that an unchallenged allegation of in vitro utility is sufficient for purposes of section 101, these objections become moot. As for how to use Interferon in an in vitro application, we have already set forth the relevant portion of the specification, the gist of which is that the “substance [Interferon] is mixed with pieces of chick chorio-allantoic membrane for 24 hours at 37° C. to allow interference to become established.” The membrane pieces are then “incubated with live influenza virus” and the yield of virus “is conveniently measured by the haemagglutinin titration test.” We think such a disclosure tells a skilled worker in this field all he needs to know in order to carry on further research and investigation.
We therefore hold that appellants’ specification satisfies the requirements of section 112.
III. Section 112: Definition of Invention
The final ground of rejection was on the basis that the “claims fail to properly define the invention.” As stated by the board:
* * * The essential feature of these claimed processes and products alike is the incubation in living animal cells and tissues of a virus which is inactivated until it has lost its power of reproduction but still has a “viral interfering activity.” What this viral interfering activity amounts to and the nature and extent of its interference are not specified in the claims and even in the claims where such source virus is indicated the manner or standard for determining that “viral interference activity” is not specified. «• * *
We point out in connection with this rejection that an applicant need not understand the theory or scientific principle underlying his invention. In re Storrs, 245 F.2d 474, 44 CCPA 981. All that an applicant need do is enable a person skilled in the art to duplicate his efforts, and appellants have certainly done so here. When the words “viral interfering activity” are read in the light of the specification, it is clear that they define the property of the attenuated virus in interacting with the other live virus in the living cell material to produce the viral interfering substance. Broad, but clearly well defined ranges of the activity of the attenuated virus are thus functionally specified. We cannot conceive how else appellants could describe the activity as clearly and conveniently; certainly an applicant may so define his terms in the specification in a pioneer area such as this.
We therefore hold that “viral interfering activity” is an adequate functional limitation governing the degree of inactivation of the attenuated virus, and is such as to convey definite meaning to one skilled in this art.
The appealed decision is accordingly reversed.
Reversed.