
98 U.S. 126 (____)
POWDER COMPANY
v.
POWDER WORKS.
Supreme Court of United States.

*130 Mr. M.A. Wheaton and Mr. William Bakewell for the appellant.
Mr. George Harding, contra.
*133 MR. JUSTICE BRADLEY, after stating the facts, delivered the opinion of the court.
The main defence relied on by the counsel of the defence, on the demurrer, is, that it is apparent that the reissued patents numbered 4818 and 4819 are not for the same invention as that which was described in the original letters-patent numbered 50,617, for a portion of which they purport to be reissues.
It is apparent, they say, that the original patent was for a process, to wit, a mode, or different modes, of exploding nitro-glycerine; whereas the reissues are for manufactured compounds or mixtures, namely, mixtures of nitro-glycerine with gunpowder, gun-cotton, and rocket powder. It is contended that a process and a mixture are the subjects of different inventions; that a patent granted for one cannot, by its surrender, be the basis of a reissued patent for the other. If this position is sound, and the matter can be examined on demurrer, it was not error to dismiss the bill as to all relief sought in reference to the two reissues in question.
*134 We have no doubt that the question may be examined on demurrer; for the bill sets forth in full both the original patent and the reissues, so that they may be examined and compared together. If it were a case in which the identity or non-identity of the inventions in the original and reissued patents was a complicated question, the court might require the defendants to answer, in order to have the benefit of evidence on the subject. But in ordinary cases, the court itself will compare them. Whether a patent is for a process or a composition is especially a question of construction, and is for the court to decide; and whether a patent for a process is the same invention as a patent for a composition is certainly a mere question of law. We feel no hesitation, therefore, in approaching the consideration of the questions presented by the pleadings.
Upon due examination of the patents in question, it cannot well be doubted that the original patent, No. 50,617, granted on the 24th of October, 1865, was for a process, or rather for different processes and appliances for producing the explosion of nitro-glycerine; nor can it be doubted that the reissued patents, Nos. 4818 and 4819, granted in 1872, are for compounds and mixtures; in other words, for compositions of matter. In the specification of the original patent, the inventor says: "My invention consists in the use as a substitute for gunpowder of nitro-glycerine, or its equivalent, substantially in the manner described hereafter, so that the said liquid, which, when exposed, cannot be wholly decomposed and exploded, shall by confinement be subjected to heat and pressure, by which its total and immediate decomposition and explosion is effected." He then proceeds: "In order to enable others to make and use my invention, I will now proceed to describe the method of carrying it into effect. On reference to the accompanying drawing which forms a part of this specification, Fig. 1 is a view, partly in section, of one apparatus by means of which I render nitro-glycerine, or its equivalent, available as a substitute for gunpowder; and Fig. 2 is a plan view. There is a class of explosive substances comprising nitro-glycerine, the nitrates of ethyl and methyl, and nitro-mannite, which have long been known, but have never been practically applied as explosive *135 agents." He then describes the behavior of these substances, when, being in an unconfined state, they are subjected to appliances of flame and contusion, no explosion being thereby produced; and then shows how, when they are in a confined state, their complete explosion may be produced by the processes which he describes; adding, "The chief point of my invention consists in overcoming the difficulty of suddenly igniting the entire mass of the materials mentioned, so that the same can be practically used as explosive agents." He then shows how nitro-glycerine may be best prepared and manufactured for the purposes of use as an explosive agent. Then he describes the four several methods or appliances for producing the explosion desired, which have already been referred to, concluding with this formal claim: "I claim as my invention, and desire to secure by letters-patent, the use of nitro-glycerine, or its equivalent, substantially in the manner and for the purposes described." The only equivalents of nitro-glycerine referred to or pointed at in the specification are the cognate substances of nitrate of ethyl and methyl and nitro-mannite. It is to be presumed that these are referred to when the patentee uses the expression, "nitro-glycerine or its equivalent."
Now, in all this specification there is not a hint of any new mixture or new composition of matter having been invented by the patentee. The only thing that approaches it is the method which he describes, of preparing the pure nitro-glycerine. The whole invention set forth, described, and claimed consists of methods or processes of exploding the substance so as to render it a useful exploding agent. The technical form of the claim, it is true, is in appearance a little broader, being for the use (generally) of nitro-glycerine as an exploding agent; but these general terms are properly limited by those which follow, namely, "substantially in the manner and for the purposes described." If any other method of exploding nitro-glycerine should be discovered different from the processes invented and described by the patentee, it could be employed without infringing his patent. According to our view, therefore, the patent is for those processes and methods as applied to the use of nitro-glycerine, or its equivalent, as an explosive agent.
*136 Inasmuch as the reissued patents in question, numbered 4818 and 4819, are for compounds of nitro-glycerine with various other substances, it is impossible not to say that they are for an entirely different invention from that secured, or attempted to be secured, by the original patent.
If the patent had been not for the mode or process of exploding nitro-glycerine, but for the process of compounding nitro-glycerine with gunpowder and other substances, inadvertently omitting to claim the exclusive use of the substances so produced, the case would have been one of very different consideration. That was the case with Goodyear's patent, which was issued in 1844, and claimed only the process of vulcanizing india-rubber. In 1849 it was surrendered, and two new patents issued in lieu thereof,  one for the process, and the other for the composition. In 1852, the validity of these reissues came up for consideration in the third circuit, in the case of Goodyear v. Day, which was argued by Mr. Choate, Mr. Webster, and other eminent counsel. Mr. Justice Grier disposed of the objections as follows: "We now come to the objections which have been made to the reissued or amended patents of 1849. The first objection is that the patents of 1844 and 1849 are not for the same invention. This objection is not founded in fact. Both patents are for precisely the same invention or discovery. They both describe, in nearly the same words, the best mode of manufacturing india-rubber, by exposing it to a high degree of heat in connection with sulphur and white lead; by which treatment the substance is endowed with new and valuable qualities which it did not possess before. The discovery is the same; the mode of manufacturing the compound is the same. The first patent had set forth the nature and extent of the invention defectively. There is no reason to doubt the bona fides and propriety of the reissue. It is apparent on the face of the papers, even if the action of the commissioner on that point was not conclusive." Again, he adds: "The fourth objection is `that the latter patent claims more than was contained in the original.' If the latter patent is for precisely the same invention, art, or discovery as that described in the first, the objection that it claims more is a mistake of fact. If the last patent differs from the first only in stating more clearly *137 and definitely the real principles of the invention, so that those who wish to pirate it may not be allowed to escape with impunity through the imperfection of the language used in the first, there has arisen one of the cases for which it was the intention of the act of Congress to provide, and the objection is worthless in point of law." This case is partially reported in 2 Wall. Jr. 283, but the opinion of Mr. Justice Grier is not stated in full. In another case, arising on the original patent of Goodyear, reported in 2 Wall. Jr. 356, Mr. Justice Grier used this expression: "The product and the process constitute one discovery." The product in Goodyear's invention was the direct result of the process. They were parts of one invention, and, except in imagination, could no more be separated from each other than the two sides of a sheet of paper, or than a shadow from the body that produces it.
The present case is entirely different. The processes which the patentee described as his invention in the original patent, No. 50,617, had no connection with the compounds or mixtures which are patented in the reissued patents. They were not processes for making those compounds, and in describing them the compounds were not mentioned. The invention of the one did not involve the invention of the other. The two inventions might have been made by different persons, and at different times.
We think, therefore, that the conclusion is irresistible, that the two reissued patents, numbered 4818 and 4819, are for a different invention from that described or suggested in the original patent No. 50,617, upon which they are founded, and which they are intended, in part, to supersede.
These reissues being granted in 1872, were subject to the law as it then stood, being the act of July 8, 1870, the fifty-third section of which (reproduced in sect. 4916 of the Revised Statutes) relates to the matter in question. It seems to us impossible to read this section carefully without coming to the conclusion that a reissue can only be granted for the same invention which formed the subject of the original patent of which it is a reissue. The express words of the act are, "a new patent for the same invention;" and these words are copied from the act of 1836, which in this respect was substantially *138 the same as the act of 1870. The specification may be amended so as to make it more clear and distinct; the claim may be modified so as to make it more conformable to the exact rights of the patentee; but the invention must be the same. So particular is the law on this subject, that it is declared that "no new matter shall be introduced into the specification." This prohibition is general, relating to all patents; and by "new matter" we suppose to be meant new substantive matter, such as would have the effect of changing the invention, or of introducing what might be the subject of another application for a patent. The danger to be provided against was the temptation to amend a patent so as to cover improvements which might have come into use, or might have been invented by others, after its issue. The legislature was willing to concede to the patentee the right to amend his specification so as fully to describe and claim the very invention attempted to be secured by his original patent, and which was not fully secured thereby, in consequence of inadvertence, accident, or mistake; but was not willing to give him the right to patch up his patent by the addition of other inventions, which, though they might be his, had not been applied for by him, or, if applied for, had been abandoned or waived. For such inventions, he is required to make a new application, subject to such rights as the public and other inventors may have acquired in the mean time. This, we think, is what the present statute means, and what, indeed, was the law before its enactment under the previous act of 1836. If decisions can be found which present it in any different aspect, we cannot admit them to be correct expositions of the law.
The counsel for the complainant refers us to, and places special reliance on, the last clause of sect. 53 of the act of 1870, where it is said: "But where there is neither model nor drawing, amendments may be made upon proof satisfactory to the commissioner that such new matter or amendment was a part of the original invention, and was omitted from the specification by inadvertence, accident, or mistake." But this clause relates only to the evidence which may be employed by the commissioner in ascertaining the defects of the specification. It does not authorize him to grant a reissue for a different *139 invention, or to determine that one invention is the same as another and different one; or that two inventions essentially distinct constitute but one. In this case, it is not necessary for us to decide, and we express no opinion as to the precise meaning and extent of the final clause of sect. 53, to which we have referred; as, whether it relates to all patents, or only to patents for machines. But as it relates to the matter of evidence alone, it cannot enlarge the power of the commissioner in reference to the invention for which a reissue may be granted. That power is restricted, by the general terms of the section, to the same invention which was originally patented. Conceding that the commissioner had a right, in this case, by virtue of the clause in question, to examine the original application of Nobel, as it stood before it was amended, in order to ascertain what his invention really was, it would only show that he described, in that paper, two different inventions,  one for a composition, and another for a process distinct from the composition. It would not prove that the two inventions were the same; and it would not authorize the commissioner, on a reissue, to add the one to the other, as a part thereof.
The complainant insists, however, that the present reissues are for the same invention which was patented in the reissued patent, No. 3380, granted in April, 1869; and that the latter reissue was granted before the passage of the act of 1870. But this fact does not help the complainant. The law relating to reissues was substantially the same under the act of 1836 as it is under the act of 1870. As before remarked, the former act as well as the latter restricted the power of the commissioner, in granting reissues, to "the same invention" which was the subject of the original patent. It has been repeatedly so held by this court, as the following cases will show: Burr v. Duryee, 1 Wall. 531; Seymour v. Osborne, 11 id. 516; Gill v. Wells, 22 id. 1; The Wood Paper Patent, 23 id. 566.
Since, therefore, the reissues in question are not for the same invention for which the original patent was granted, it follows that they are void; and the bill must be dismissed so far as relates to the said reissued patents numbered respectively 4818 and 4819.
*140 As nothing is shown, however, in the statements of the bill, which affects the validity of the third patent sued on, the bill should not have been dismissed as a whole, but only as to the said reissues 4818 and 4819. For this error the decree must be reversed, and the cause remanded with directions to enter a decree in conformity with this opinion, dismissing the bill as to all relief sought therein in respect of, or in reference to or founded upon, the said reissued patents numbered respectively 4818 and 4819, and, as to the residue of the bill, overruling the demurrer and directing the defendants to answer in accordance with the rules and practice of the court.
So ordered.
