DocketNumber： Patent Appeal 6709
Citation Numbers： 301 F.2d 686, 49 C.C.P.A. 1039
Judges： Worley, Rich, Martin, Smith, Kirkpatrick
Filed Date： 5/4/1962
Status： Precedential
Modified Date： 10/19/2024
This appeal is from a decision of the Patent Office Board of Appeals which affirmed the examiner’s rejection of claims 1-5, inclusive, of appellant’s application serial No. 536,086 for a method of forming hollow, frusto-conical articles from flat metal stock. The claims were rejected under 35 U.S.C. § 103 as being obvious in view of the following references:
Kelley et al. 1,901,035 Mar. 14, 1933
Lindgren Re. 19,790 Dec. 17, 1935
British Patent 436,768 Oct. 17, 1935
Claim 1 is typical of the claims on appeal and reads as follows:
“1. The method of making a hollow generally conical-shaped article having a tapered side comprising the steps: working a blank having an annular portion of tapering cross [section]1 by mounting said blank on a spindle having a conical-shaped portion and while the spindle and blank are rotating, axially displacing said annular portion by making a roller move in a path non-parallel to the surface of the conical-shaped portion of the spindle so that the thickness of the side being formed taken at any point thereon in a direction generally parallel to the rotational axis of the spindle is equal to the corresponding thickness of the original blank.”
Appellant’s claims 1-3 are similar and for present purposes can be considered as one. Claim 4 recites the steps of mak
The sole issue for determination is whether the board was correct under 35 U.S.C. § 103 in holding that appellant’s claimed invention was obvious at the time it was made to one of ordinary skill in the art in view of the disclosures in the cited references.
Appellant’s invention relates to a method of forming a hollow, frusto-conical article with a tapered wall from a flat or cup-shaped blank by spinning the blank and axially displacing the layers or strata of metal with a roller which moves relative to the face of a rotating spindle.
Appellant’s spinning method is similar in general to that used in the metal spinning arts, as shown by the Lindgren and British patents. A round metal blank is first clamped on the top of a spindle having a frusto-conical shape. As the spindle and blank are rotated, the roller pushes the metal along the tapered sides of the spindle to form a hollow frustocone and the metal is deformed to the shape of the spindle by axial displacement. To understand that operation it is necessary to visualize the starting blank as being composed of an infinite number of layers or strata lying in a plane parallel to the axis of the spindle. The roller is so directed during the spinning operation that the metal strata of the blank are axially displaced relative to each other, i. e., they slide relative to each other and are not compressed or elongated in length. Thus at any point on the surface of the spindle, appellant contends, the thickness of the frustocone wall, measured in a direction parallel to the spindle axis, is equal to the thickness of the original blank, measured in the same direction at an equal radial distance from the rotational axis. In forming a hollow frusto-cone by a spinning method utilizing the principles of axial displacement, as disclosed by the prior patents, the inner surface of the wall of the hollow frusto-cone is defined by the' spindle surface, and the outer surface of the cone wall is defined by the path of the roller which moves in a path parallel to the outer surface of the spindle.
Lindgren and the British reference, supra, both disclose the general method described. Appellant, however, predicates novelty and unobviousness of his method on the asserted fact that the methods of such references are unable to form by spinning a metal frusto-cone with a tapered or non-uniform wall thickness following the principle of axial displacement while he is able to do so. In appellant’s method, he first rolls or otherwise forms a tapered or cup-shaped blank from a flat piece of sheet metal. This tapered or cup-shaped blank is then spun on a frusto-conical spindle. To form a frusto-cone with a tapered wall, appellant’s roller is positioned to move along a path non-parallel to the spindle surface, so that it comes closer to the spindle as it moves along the spindle surface. Appellant asserts that this method results in axial displacement of the metal blank since the non-parallel roller path is so designed that the thickness of the tapered watt, measured in a direction parallel to the spindle axis, is the same as the thickness of the tapered or cwpshaped blank, measured in the same direction at the same radial distance from the spindle axis.
Appellant states his position in his brief:
“The change over the references is a simple one, the change being in the use of the tapered blank and in a non-parallel roller path being chosen so that the thickness of the side being formed, taken at any point on the side in a direction parallel to the axis of the spindle, is equal to the corresponding thickness of the tapered blank.”
The sole issue thus is whether, in using a blank having a tapered cross section and a roller path not parallel to the conical surface of the spindle, appellant has done anything more than would have been obvious to a worker of ordinary skill in the art at the time appellant’s
The board held that the use of a blank with a tapered cross section and a roller path not parallel to the conical surface of the spindle is a mere extension of the idea of axial displacement taught by the Lindgren and British references and was, therefore, but an obvious adaptation of that idea to the specific shape desired in the finished article and that the steps of forming a tapered blank from flat metal stock is fully shown by the Kelley et al. reference.
Appellant does not predicate any patentable significance on the steps relating to forming a tapered blank from flat stock.
Appellant’s contention is that the references do not suggest how the methods as therein disclosed can be used for forming cones with a tapered wall without relying on appellant’s disclosure. Specifically, appellant contends that Lindgren’s discussion of axial or strata displacement where the blank is flat and the roller moves parallel to the spindle surface and is spaced therefrom at a distance t2=ti sine k is not applicable to the process of forming a frusto-cone with a tapered wall.
In determining the issue here we are required by 35 U.S.C. § 103 to do so from the vantage point of one having ordinary skill in the metal spinning art and then to determine whether or not the claimed invention would have been obvious to such a person at the time the invention was made. This requires us to view the prior art without reading into that art the teachings of appellant’s invention. In re Murray and Peterson, 268 F.2d 226, 46 CCPA 905.
Neither appellant’s application nor the record before us give us anything of a factual nature upon which to ascertain the problem faced by the prior art in spinning a frusto-cone with a tapered wall. Assertions are made by appellant’s counsel that the problem was to prevent swaging in the metal as it was spun and was solved by appellant through use of 1) a tapered blank and 2) a non-parallel roller path. These assertions have not been disputed by the examiner or the board, nor has any reference been cited which shows the formation by a metal spinning method of any article having a tapered wall. In judging what requires uncommon ingenuity, the best standard is what common ingenuity has failed to contrive. Western States Machine Co. v. S. S. Hepworth Co., 2 Cir., 147 F.2d 345, 347. In the absence of any contrary showing in the record before us, we must assume that no one before appellant had ascertained, as he did, that a frusto-conical article with a tapered wall could be axially spun by use of 1) a tapered blank and 2) a roller path non-parallel to the surface of the forming spindle.
Once appellant’s solution to the problem of making a tapered wall frusto-cone is disclosed, it is easy to see how the prior references can be modified and manipulated to produce this type of cone. The change admittedly is simple and by hindsight seems obvious. However, the simplicity of new inventions is oftentimes the very thing that is not obvious before they are made. This court, in In re Osplack, 195 F.2d 921, 39 CCPA 932, stated:
“We think this case is one of that category of inventions which, when viewed after disclosure and explanation by an applicant, seem simple and such as should have been obvious to those in the field. Yet this does not necessarily negative invention or patentability. Goodyear Tire & Rubber Co., Inc. [et al.] v. Ray-O-Vac Co., 321 U.S. 275, 64 S.Ct. 593, 88 L.Ed. 721; In re DeLancey, 159 F.2d 737, 34 C.C.P.A. (Patents) 849. Indeed, simplicity may even be some evidence of invention. Baldwin-Southwark Corporation v. Tinius Olsen Testing Mach. Co. [et al.], 3 Cir., 88 F.2d 910.”
The solicitor, in answer to appellant’s assertion that the Lindgren formula t2=ti sin K is not applicable to spinning an article with a tapered wall, has submitted a drawing based upon Lindgren’s figure 6 to show that the formula can be made applicable to appellant’s process. While we agree with the board and solicitor that the formula disclosed by Lindgren could be used by appellant to define the relation between the roller path distance and the blank width in a direction parallel to the axis of rotation at any point on the surface of the spindle, we do not think that this conclusion is determinative of the issue of obviousness. Lindgren (and the British reference) discloses spinning processes where the roller path is parallel to the spindle surface and the blank thickness is constant. The formula disclosed by Lindgren is useful in ascertaining the roller path in one calculation only where the blank thickness, ti, remains constant. Appellant’s non-parallel roller path cannot be found unless the formula of Lindgren is applied several times along the radial width of the tapered blank, which tapered blank is not shown by Lindgren or the British reference.
Lindgren shows in figure 4 a product which has a cone wall of constant thickness with a lower or outer flange of thickness greater than the cone wall. It is clear that Lindgren did not contemplate use of a blank of variable thickness to obtain such a product, since he states:
“If the desired thickness of the outer flange is less than of the original material but greater than that of the conical mantle, I produce, by spinning, a semi-manufactured disk in the shape of two conical mantles, one below the other, the top angle of the lower mantle being made greater than that of the upper mantle.” [Emphasis added.]
It is also clear that the British patent did not contemplate use of a tapered blank to vary the wall thickness of the product. This patent states:
“The thickness of the [cone wall] material will of course vary and depends at each point on the angle of inclination.” [Emphasis added.]
We are unable to find in the art relied upon by the board any teaching prior to appellant’s invention that a metal spinning process could be used to provide the desired hollow conical-shaped article having a tapered side. Nor do we find any teaching in the art of the use of a tapered blank of variable thickness in order to form a spun article with a tapered or variable thickness wall.
Obviousness is a legal conclusion which we are required to draw from facts appearing in the record or of which judicial notice may be taken. Thus before we can conclude that any disclosed invention is “obvious” under the conditions specified in 35 U.S.C. § 103, we must evaluate facts from which to determine 1) what was shown in the prior art at the time the invention was made, and 2) the knowledge which a person of ordinary skill in the art possessed at the time the invention was made. Here, neither the record nor the facts of which we are able to take judicial notice supplies the factual data necessary to support the legal conclusion of obviousness of the invention at the time it was made. We are unwilling to substitute speculation and hindsight appraisal of the prior art for such factual data. For this reason we think there is a doubt as to the
For the foregoing reasons, the decision of the Board of Appeals is reversed.
. The word “section” is omitted from claim 1 as presented but the applicant, the examiner and the board of appeals all agree that it should be inserted as is here done.