Westinghouse Electric & Mfg. Co. v. Condit Electrical Mfg. Co.

194 F. 427 | 2d Cir. | 1911

NOYES, Circuit Judge

(after stating the facts as above). [1] Our decision in the circuit breaker patent case has little application here. We regarded) the question of invention in that case as doubtful hut resolved it in favor of the patentees by reason of especial advantages in the structure, none of which, except perhaps the form, had any reference to the switch element. Besides we think that the claims of this patent cover something more than the switch of the other. This case also differs from that in that there it appeared that the circuit breaker had gone into extensive use, while it is not shown that this switch has had any substantial use. It seems to have failed entirely to supplant the old knife-blade switch.

The primary question then is whether invention is to be found in the present claims of which we may take claim 1 as typical, the elements being:

(a) Stationary terminals with contact faces in substantially the same line and with a supporting base;

(b) A laminated member having beveled ends for engagement with the faces of the terminals;

(c) A supporting arm pivoted at one end to the base and attached to the laminated member at substantially the middle part of the latter and at a considerable distance from the axis of movement of said arms :

(d) An actuating lever pivoted to the base and having a movable connection with the supporting arm.

The advantages of this construction urged by the complainant in its brief may thus be summarized:

(1) It is said that by the adoption oE the beveled laminated contact member perfect contact is obtained and the binding friction of the old switches obviated. Indeed as shown by the specification this seems to have been regarded by the patentees themselves as the principal change from the prior art. Tt is also pointed out in the brief that the scraping action of the laminae keeps the surfaces bright: and secures good contact.

(2) It is contended that by mounting the movable contact upon a swinging arm a wide break is secured to interrupt the arc.

(3) It is also urged that the movement of the swinging arm is such that a minimum of lateral space is required.

Much stress is placed upon the presence and action of a toggle lever, but we find no reference to that form of construction in the claims in issue nor do we think the presence of such a lever necessarily to be read into the claims by reason of anything in the drawings or specification. Indeed one of the drawings shows a form of connection other than a toggle lever.

Now, the record! shows clearly that at the date of this alleged invention, the use of a laminated contact member with beveled ends was old in the art of electrical switches. The departure from the gripping engagement of the old kpife-contact and the substitution therefor of face to face contacts, are shown by several patents older than this one. So pivoted supporting arms, actuating levers and various forms of connections for bringing the movable member into contact with the stationary members and for breaking the arc are shown in earlier patents. It is unnecessary to seek precise anticipations. It is sufficient to say that with the structures in the prior art shown by the record, we think that mechanical skill was quite sufficient to obtain any advantages disclosed by the patent. In our opinion, the elements of the claims considered separately are old, and we find nothing in their combination disclosing invention.

[2] We have reached the conclusion of invalidity without referring to the proceedings in the Patent Office because we fail to see that those proceedings have an}? bearing upon the questions arising in this case. Sometimes such proceedings are of importance, especially where a matter of estoppel is involved. Thus a patentee who, in order to avoid a rejection of his application, inserts limitations in his claims is estopped from contending that the patent as issued should be construed as if such limitations had not been made. But, as a general rule, the interpretation to be placed upon the claims and specification of a patent is to he determined from the language of the grant, and the proceedings in the Patent Office are quite immaterial. Such is the situation in the present case. Original claims were rejected in the Patent Office. Thereupon the applicants, instead of limiting their claims, substituted' broader ones which were accepted. Presumably the examiner changed his mind. But whatever be the explanation of his position, nothing whatever is shown to work an estoppel against the patentees. Instead of surrendering something which they now claim to obtain that which was allowed, they claimed something more and got it.

The decree of the Circuit Court is affirmed with costs.