This is an action for infringment of reissued letters patent No. 11,047, granted to the Electrical Accumulator Company of New York, as assignee of Joseph Wilson Swan, on' the 17th of December, 1889, for an improvement in secondary batteries. The invention of the reissue is intended to facilitate the construction of secondary battery plates by preparing them with-perforations, cells or holes extending through the plate, in which holes the active material is packed. The original patent, No. 812,599, dated February 17, 1885, was considered by this court in the case of Accumulator Co. v. Julien Co., 38 Fed. Rep. 117. The original was held invalid (pages 140-142) for the reason that it described and claimed a plate the outer surface of which might be covered by the active material. This construction, in view of the work done by Prof. Eaton, was held to he anticipated. The theory of the reissue is that the valuable feature .contributed by Swan consists in confining the active material to the holes, without permitting it to extend beyond them to the surface of the plate. That portion of the original which refers to the coating of the outer surface of the plate has been omitted in the reissue. In other respects the description is unchanged.
The claim is as follows:
“A perforated or cellular plate for secondary batteries, having the perforations or cells extending through the plate and the active material or Material to become active packed in the said perforations or cells only, substantially as described.”
This is the claim of the original, except that the word “only” has been added. The patent cannot be criticised as a reissue. The *82claim instead of being broadened is greatly restricted. The application was filed within a reasonable time after the inventor was informed of the facts which made a narrower claim necessary. The facts bring the case within the provisions of section 4916 of the Revised Statutes.
The field of invention is, concededly, a narrow one. The counsel for the defendant correctly states that Swan’s improvement consists “wholly in the idea of putting on the surface of a perforated plate for secondary batteries no active material beyond the contents of the perforations; everything except this is conceded to be old.” The date, de jure, of Swan’s invention is January 18, 1882. Prior to that time Prof. Eaton had filled the perforations, but he had covered both sides of his plate as well. Mr. Brush had rammed or pressed absorptive substance; in the form of dry powder, into grooves or receptacles without covering the surface of the plate. No one had packed active material into holes extending through the plate, confining it entirely to these holes. This combination was original with Swan. Did it involve invention? In approaching this subject it is well to remember, as the court has frequently had occasion to remark before, that we are dealing with a comparatively new and abstruse art, where the most important results are said to follow from changes, apparently, of the most unimportant character. Complete success has not been attained, but if we may credit the statements of those who are entitled to speak ex cathedrh on the subject, the rapid strides in that direction during the last decade, are due to changes of form and material which, in many other arts, would be insufficient to support invention. The substitution of one material for another in a door-knob is the work of the méchanic,'the substitution of one material for another in secondary battery electrodes may solve a problem which will revolutionize the motive power of the world.
In holding that there is sufficient invention disclosed to support the reissue the court is influenced by the following considerations: The Swan electrode is to-day the electrode of commerce. It has largely taken the place of other structures and is almost universally used. The advantage of having the active material composed of small disconnected masses, packed in holes extending through the plate, is unquestioned. The electrolyte is thus permitted to reach and operate upon both sides of these small masses, instead of on one side where the active material is packed in cells or pockets. The expansion and contraction of the electrode when the battery is in use causes the active material, if packed in cells or grooves or spread upon the surface of the plate, to crack, and portions of it to be pushed out of place and to fall away. These defects which produce “buckling,” “short circuiting” and other disastrous results are entirely remedied by the Swan construction. If one of the small masses in his plate becomes injured of falls out it does not affect injuriously the other parts of the electrode. As Sir William Thomson puts it: “The perforated platés have also the great advantage of extending the area of electric communication between the continuous metallic conductor and the porous or spongy material and so *83minimizing tbe electric resistance. The application of tbe oxide in the form of numerous mutually detached parts, separately held by the perforations, has also a great advantage in almost annulling the warping or fracturing effects of the expansion and contraction produced by the changes of oxidation to which the active material is exposed in the (¡barging and discharging of the battery.” It is true that the step from the structures of Eaton and Brush to the electrode of Swan seems to be very short when looking back upon the work of these men. But standing where Brush and Eaton did and looking forward to the ideal electrode which should avoid the then existing difficulties and possess the excellencies of the present Swan structure, the steps undoubtedly seemed many and long. If it had occurred to Eaton to scrape off the active material from his plate leaving the holes full, he -would have hit upon the invention. But it never did. If Brush had thought of punching out the bottom of his receptacles and had then rammed them full of active .-material without covering the external plate he would he entitled to the credit of having made the successful structure. But he did not think of it. The experiments at that time seemed to be proceeding along different linos, the object being to keep as much material as possible upon the surface of the plate. The conviction cannot he avoided that the idea which lias-made these plates a commercial success was first given to the world in a practical embodiment by Mr. Swan.
Confirmation of these views is found in two recent decisions of the supreme court. In Washburn & Moen Manuf'g Co. v. Beat’ Em All Barbed-Wire Co., 12 Sup. Ct. Rep. 443, the court says:
“The difiere :ice between the Kelly fence and the G-liddon fence is not a radical one, but slight as it may seem to be, it was apparently this which made the barbed-wire fence a practical and commercial success. The inventions of Ilnnt and Smith appear to be scarcely more than tentative, and never to have gone into general use. The sales of the Kelly patent never seem to have exceeded 8,000 tons per annum, while plaintiff’s manufacture and sale of the Glidden device (substituting a sharp barb for a blunt one) roso rapidly from 50 tons in 1874 to 44,000 tons in 1880, while those of its licensees in 1887 reached the enormous amount of 178,000 tons. * * * Under such circumstances courts have not been reluctant to sustain a patent to the man who has taken the iinal step which has turned a failure into a success. In the law of patents it is the last step that wins. - It may be strange that, considering the important results obtained by Kelly in his patent, it did not occur to him to substitue a coiled wire in place of the diamond-shaped prong, but evidently it did not; and to the man to whom it did ought not to be denied the quality of an inventor. ”
In Magowan v. Belting, etc., Co., 141 U. S. 332, 12 Sup. Ct. Rep. 71, it was held that the fact that the patented improvement “went at once into such an extensive public use, as almost to supersede all packings made under other methods, * * * was pregnant evidence of its novelty, value and usefulness.” These quotations seem peculiary applicable to the present controversy. The principles which are there so clearly and pointedly reaffirmed require a decision sustaining the validity of the complainant’s patent. As to defendant’s infringement there can be no *84doubt. The question arising upon the expiration of the Danish patent has not beep argued. The casual examination which the court, in the absence of explanation, has been able to give to this patent leads to the conclusion that it is not for the same invention as the Swan reissue.
There should be a decree for the complainant.