OPINION OF THE COURT
PER CURIAM.
This appeal challenges that part of the August 17, 1967, opinion of the District Court, 272 F.Supp. 441 holding that “the Cole patent is invalid for obviousness under Section 103 (35 U.S.C.A. § 103)” 1 and the October 5, 1967, order of the District Court based on such opinion2 dismissing the Complaint of the appellants, an assignee and an exclusive licensee under the Cole patent.
Claim 4 of the Cole patent calls for a process of producing a citrus juice concentrate. The juice is maintained in a state of continuous agitation, while subject to freezing temperatures, to convert it into a pumpable slurry with ice crystals “less than about Vs2 inch in the greatest dimension” from which the first concentrate is separated. A second concentrate is then formed by washing the ice crystals “at a temperature below the freezing point” with sufficient “aqueous liquid at a temperature above the freezing point”, with such concentrate having “a Brix value closely approaching the Brix value of the first concentrate.”3 Appellee’s expert (Dr. Redd) testified that several prior and one co-pending patent disclosed basic [609] parts of the process described in Claims 4-8 of the Cole patent and that the process which it described would have been obvious to a man skilled in the field of juice concentration on or before the date when the application for the Cole patent was filed. Dr. Redd gave specific reasons, with references to prior patents, why he disagreed with appellant’s expert, Dr. Tressler, on this point. In the District Court’s findings, it adopted at least some of the views of Dr. Redd. Also, it explicitly rejected the views of appellant’s expert. After a review of the record, we are unable to conclude that the District Court committed clear error in its findings as grounded in its reliance upon appellee’s qualified expert4 and other evidence in the record. See Graver Tank & Mfg. Co. v. Linde Air Products Co., 336 U.S. 271, 274, 275, 69 S.Ct. 535, 537, 93 L.Ed. 672 (1949), rehearing 339 U.S. 605, 70 S.Ct. 854, 94 L.Ed. 1097 (1950), a patent case, where the court said:
“Rule 52(a) of the Federal Rules of Civil Procedure provides in part: ‘Findings of fact shall not be set aside unless clearly erroneous, and due regard shall be given to the opportunity of the trial court to judge of the credibility of the witnesses.’ To no type of case is this last clause more appropriately applicable than to the one before us, where the evidence is largely the testimony of experts as to which a trial court may be enlightened by scientific demonstrations. * * *
“The rule requires that an appellate court make allowances for the advantages possessed by the trial court in appraising the significance of conflicting testimony and reverse only ‘clearly erroneous’ findings.”5
The District Court’s opinion shows that it followed this language used in Graham v. John Deere Co., 383 U.S. 1, 17, 86 S.Ct. 684, 693, 15 L.Ed.2d 545 (1966):
“Under § 103, the scope and content of the prior art are to be determined; differences between the prior art and the claims at issue are to be ascertained ; and the level of ordinary skill in the pertinent art resolved. Against this background, the obviousness or non-obviousness of the subject matter is determined.”
See, also, Gould-National Batteries, Inc. v. Gulton Industries, Inc., 361 F.2d 912, 915 (3rd Cir. 1966), where this court held that a “claim * * * comprised of an aggregation of elements which the court below found were old and well known in the art * * * is invalid for its failure to meet the test of § 103”; cf. Allen-Bradley Company v. Air Reduction Company, 391 F.2d 282 (3rd Cir. 1968).
The order of the District Court dated October 5,1967, will be affirmed.
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OPINION OF THE COURT
PER CURIAM.
This appeal challenges that part of the August 17, 1967, opinion of the District Court, 272 F.Supp. 441 holding that “the Cole patent is invalid for obviousness under Section 103 (35 U.S.C.A. § 103)” 1 and the October 5, 1967, order of the District Court based on such opinion2 dismissing the Complaint of the appellants, an assignee and an exclusive licensee under the Cole patent.
Claim 4 of the Cole patent calls for a process of producing a citrus juice concentrate. The juice is maintained in a state of continuous agitation, while subject to freezing temperatures, to convert it into a pumpable slurry with ice crystals “less than about Vs2 inch in the greatest dimension” from which the first concentrate is separated. A second concentrate is then formed by washing the ice crystals “at a temperature below the freezing point” with sufficient “aqueous liquid at a temperature above the freezing point”, with such concentrate having “a Brix value closely approaching the Brix value of the first concentrate.”3 Appellee’s expert (Dr. Redd) testified that several prior and one co-pending patent disclosed basic [609] parts of the process described in Claims 4-8 of the Cole patent and that the process which it described would have been obvious to a man skilled in the field of juice concentration on or before the date when the application for the Cole patent was filed. Dr. Redd gave specific reasons, with references to prior patents, why he disagreed with appellant’s expert, Dr. Tressler, on this point. In the District Court’s findings, it adopted at least some of the views of Dr. Redd. Also, it explicitly rejected the views of appellant’s expert. After a review of the record, we are unable to conclude that the District Court committed clear error in its findings as grounded in its reliance upon appellee’s qualified expert4 and other evidence in the record. See Graver Tank & Mfg. Co. v. Linde Air Products Co., 336 U.S. 271, 274, 275, 69 S.Ct. 535, 537, 93 L.Ed. 672 (1949), rehearing 339 U.S. 605, 70 S.Ct. 854, 94 L.Ed. 1097 (1950), a patent case, where the court said:
“Rule 52(a) of the Federal Rules of Civil Procedure provides in part: ‘Findings of fact shall not be set aside unless clearly erroneous, and due regard shall be given to the opportunity of the trial court to judge of the credibility of the witnesses.’ To no type of case is this last clause more appropriately applicable than to the one before us, where the evidence is largely the testimony of experts as to which a trial court may be enlightened by scientific demonstrations. * * *
“The rule requires that an appellate court make allowances for the advantages possessed by the trial court in appraising the significance of conflicting testimony and reverse only ‘clearly erroneous’ findings.”5
The District Court’s opinion shows that it followed this language used in Graham v. John Deere Co., 383 U.S. 1, 17, 86 S.Ct. 684, 693, 15 L.Ed.2d 545 (1966):
“Under § 103, the scope and content of the prior art are to be determined; differences between the prior art and the claims at issue are to be ascertained ; and the level of ordinary skill in the pertinent art resolved. Against this background, the obviousness or non-obviousness of the subject matter is determined.”
See, also, Gould-National Batteries, Inc. v. Gulton Industries, Inc., 361 F.2d 912, 915 (3rd Cir. 1966), where this court held that a “claim * * * comprised of an aggregation of elements which the court below found were old and well known in the art * * * is invalid for its failure to meet the test of § 103”; cf. Allen-Bradley Company v. Air Reduction Company, 391 F.2d 282 (3rd Cir. 1968).
The order of the District Court dated October 5,1967, will be affirmed.
“The Cole invention, as described in Claim 4, contemplates the initial freezing of the beverage liquid to form a pumpable slurry in the manner disclosed in the co-pending Walker application. From this slurry two concentrates are formed in the following manner: The slurry is continuously fed to a centrifuge where the slurry is centrifuged to separate the ice crystals from the liquid constituent of the slurry and thus produce a spun off or first concentrate. The remaining ice crystals, while still under centrifugal conditions are then subjected to a single washing with an aqueous liquid. The aqueous liquid has a substantially lower Brix value than the first concentrate. The ice crystals are washed at a temperature below freezing and the aqueous liquid with which they are washed is at a temperature above freezing. The quantity of aqueous liquid used is so proportioned as to provide the second concentrate with a Brix value closely approximating the Brix value of the first concentrate, and the ice residue which remains after the washing has substantially no Brix value.
“Claim 5 of Cole limits the process described in Claim 4 to orange juice.”