No. 3510 | 6th Cir. | May 6, 1921
Suit for infringement of patents numered 1,167,-742 and 1,167,743, to Conrad, assignor to plaintiff, relating to noiseless gears, both issued January 11, 1916, under original application of July 2, 1913 — the claims in issue being Nos. 3, 7, 8, and 14 of the first-numbered patent, and claim 3 of that bearing the second number. Claim 7, which is fairly typical of the four claims of the first-numbered patent, reads:
“A gear having a self-sustaining working body portion, composed of fibrous mateiial and a pbenolic condensation product.”
Claim 3 of the second-numbered patent, reads:
“A gear having a self-sustaining working body portion, composed of lamina-tions of cloth and a phenolic condensation product.”
The only difference between the two claims quoted is that the first calls for “fibrous material,” and the second for “laminations of cloth.”' A characteristic feature of each of the claims in suit is the lack of requirement of end plates or shrouds for the completed gears.
The District Judge dismissed the bill on this course of reasoning: That Conrad was not the first inventor of the use in gear making of a fibrous material bound by a phenolic condensation product, nor [necessarily implied in the facts found] of a self-sustaining material of that character; that hard fiber, so called, was a self-sustaining material, and had.previously been familiarly used for the manufacture of noiseless gears, with or without shrouds; that the new element which made plaintiff’s gears highly useful and commercially successful, and superior in. some adaptations to all preceding types of noiseless gears, was the composition of bakelite and fiber known as “bakelite micarta,” which was not Conrad’s production, but that of Baekeland; that bake-lite micarta yv&s in substance an improved hard fiber, although the micarta contained a new and better binding cement and the process of its manufacture left the fiber unimpaired; that Baekeland considered reinforcing plates necessary to the strength of the gear, but that Conrad had sufficient confidence in bakelite micarta to* describe a gear made of it without the use of shrouds (so recognizing that under some conditions, at least, shrouds were unnecessary, and so describing them as an alternative), although not sufficiently confident to discard them altogether — his claims accordingly covering gears with or without end plates.
Consideration of the record and briefs and of the arguments of coun sel is convincing o£ the correctness of the court’s conclusions. That each of the Conrad claims in suit was intended to cover gears of bake-lite micarta, whether shrouds were used or not, plainly appears from these considerations: The claims do not in terms exclude shrouds, on the contrary, the term “self-sustaining working body portion” was obviously meant to be broad enough to include the “working body” between the metal shrouds, should they be used; the specification expressly provides for- gears with shrouds for “added -strength” and to protect the edges of the gears (indeed, Fig. 3 of the first-numbered Conrad patent shows end plates); metallic plates are excluded as "unnecessary in any case for clamping processes, but not as unnecessary in ail cases for strengthening the gear. These considerations are emphasized by the facts that plaintiff began making the bakelite micarta gears with shrouds, progressively leaving them off larger and larger sizes, and as late as August, 1916, publicly recommending end plates “wherever the requirements arc unusually severe, or where the diameter of the gear is several times the width of the face.” These considerations apply equally to “fibrous material” and “laminations of cloth.”
We are not impressed by plaintiff’s criticism that the metal plates could not be taken from the Baekeland gear without destroying it entirely and “leaving the binding material alone, with nothing to bind.” In fact, plaintiff’s expert concedes that, if the outside plates “came off” from Fig. 1 of the Baekeland gear patent, we “would have the Conrad gear.” The fact that Baekeland describes his end plates as “interlocking” with the “homogeneous and nonplastic body lying between” them does not establish their function as compression plates, but is consistent with the idea of a purely strengthening purpose, especially when considered with other portions of the specification. But, even if Baekeland had supposed shrouds necessary to make the gear “self-sustaining,” the result is not changed thereby; for a prior use of hard fiber gears is thoroughly established, and not only of self-sustaining character, but in limited sizes without shrouds; and the record discloses no good reason why the skilled mechanic should have doubted that bakelite micarta had as favorable properties in the direction stated as hard fiber. It is conceded that there would be no invention in substituting bakelite micarta for hard liber in the manufacture of gears, and it appears that hard fiber gears are used for automobiles and other purposes without shrouds, up to a diameter of seven inches. It is true that hard fiber gears had previously been used only in small sizes and
We not only think the conclusion reached below was right, and that the decree must be affirmed, but, in connection with the comments we have made, we adopt the opinion of Judge Peck as a sufficient statement of the grounds of our affirmance.