required, before United States patents could issue to them, to surrender any patents that might have been granted to them by the different states before the federal government was established. This statute also provided that the application should be made to the secretary of state, and that interferences between applications should be decided by a board of three arbitrators. A government fee of $30 was established, and a penalty of triple damages imposed on infringers. Supplemental acts were passed in 1794 and 1800, the latter of which extended patent privileges to aliens who at the time of making application had been for two years resident in the United States, and required all applications made pursuant to that act to be accompanied by an oath to the effect that, to the best of the applicant's knowledge and belief, the invention "had not been known or used in this or any foreign country." A few years later the constitutional question arose whether a state still had power to grant patents, notwithstanding the provision of the constitution giving power of legislation on patents to congress. In 1798 an act had been passed by the New York legislature granting to Robert R. Livingston "the sole and exclusive right and privilege of constructing, making, using, employing and navigating all and every species or kinds of boats or watercraft, which might be urged or impelled through the water, by the force of fire or steam, in all creeks, rivers, bays and waters whatsoever, within the territory and jurisdiction of this state," for the term of twenty years from the passage of the act, provided that he should, within twelve months, construct a boat of at least twenty tons capacity to be propelled by steam, the mean progress of which, against the current or tide of the Hudson river, should be not less than four miles an hour. Livingston having failed to accomplish this, the same provisions were re-enacted in 1803, and again in 1808, securing like privileges to Livingston and Robert Fulton. Steam navigation having now become an accomplished fact through the efforts of these men, others undertook, without license from them, to use the same motive power in navigating the Hudson. Livingston and Fulton then applied to the state courts for an injunction, which was at first denied on the ground that the act of the New York legislature was contrary to the clause of the United States constitution giving congress power to legislate upon letters patent. But upon appeal, Thompson and Kent, JJ., held that the act was constitutional, on the ground that federal jurisdiction over patents was not exclusive, and the injunction was granted (Livingston vs. Van Ingen, 9 Johns, 506.) Similar privileges were then granted in Massachusetts, New Hampshire, Pennsylvania and Tennessee, to citizens of those States. The question of the constitutionality of this legislation was subsequently raised in the United States supreme court, in Gibbons vs. Ogden, 9 Wheat., 1. The precise point was not decided, however, the New York act being held to be unconstitutional,

because in contravention of the laws of the United States regulating commerce. Since that time, however, notwithstanding the eminent dissenting authority of Chancellor Kent and Judge Tucker, the opinion has prevailed that federal jurisdiction over patents is exclusive, and the question must now be regarded as so settled. In 1819 a law was enacted by congress, giving the United States circuit courts original jurisdiction of all actions arising under the patent or copyright laws of the United States. The first provision for the "reissue" of defective patents was made in the act of 1832, which also provided for the annual publication of the lists of expired patents, and established a system of renewing or extending patents about to expire upon application to congress. Another statute, passed in 1832, extended patent privileges still further by permitting every resident alien who had duly made a preliminary declaration of his intention to become a citizen, to obtain patents on condition of introducing the inventions into public use in the United States within a year of the date of the patents. Such was the earlier legislation of congress upon patents; and although many important inventions and discoveries were protected under these laws, the patent system as a whole remained as yet in a comparatively undeveloped state. It is stated that from 1790 till 1803 the whole business of issuing patents was practically done by one of the clerks in the department of state. In 1803 Dr. Thornton was appointed by Jefferson superintendent of this branch, and held the office until 1827. The whole number of patents issued from 1790 to 1836, a period of forty-six years, was only 10,020. The patent office now issues more than that number every year. During this period, however, the elementary principles of law governing patent rights were settled in the courts, and the foundation was laid in the decisions of Marshall and Story for the subsequent development of that branch of jurisprudence. - The year 1836 marks an era in the development of the American system. In that year an act was passed which superseded the earlier legislation, and in an elaborate series of provisions, brought the patent system into something like its present condition. The patent office was established as a branch of the department of state, and a staff of officials created, with the commissioner of patents at the head. The most important feature of the law was the provision requiring a preliminary examination to be made into the novelty and patentability of each invention before issuing the patent. This was a radical innovation, but it has proved a beneficent one. This law also made provision for the decision of interfering applications, and enabled aliens, after a year's residence in the United States, and under the conditions of the former act, to take out patents. The government fee for citizens and resident aliens was fixed at $30, while for subjects of Great Britain it was $500, and for other aliens $300. The reissue practice was confirmed and extended, and provision was

out a machine. - The term "composition of matter" includes "patent medicines" and all compounds or mixtures of substances, as articles of food, etc. The resultant article or "composition" must, of course, be new, to be the subject of a patent, but the question is not, whether the ingredients or components are new, but whether there is novelty in the combination, and the novelty may consist in combining, in new proportions, ingredients which have already been in extensive and common use for the purpose of producing a similar composition. - Besides the foregoing classes of the subject matter of patentable inventions, the statute provides for patenting "improvements," and the larger number of patents are issued for improvements. It was early decided that a patent for the improvement of a machine is the same thing as a patent for an improved machine, but of course the patent can only be taken for the new combination. It should be noticed that the patent office does not undertake to determine whether the improvement will in- | fringe an existing patent. But if the improvement is novel, the patent is issued and the question of infringement left to the courts. The test of the validity of a patent for an improvement of an existing machine, is to ascertain whether there has been actual and substantial change, or merely formal alteration requiring no invention. If no substantially new element has been added to the old machine, the patent can not be sustained; but if some really new feature has been introduced into the old mechanism, which causes it to operate differently or produces a new or better effect, then such addition will properly be the subject of a patent as an improvement. Two classes of questions therefore arise in passing upon the validity of a patent for an improvement of a machine. First, where the effects produced are the same, the inquiry is, whether the modus operandi of the improved machine is substantially the same as that of the old machine, or whether the difference in operation is sufficient to sustain a patent; second, where the effects produced by the improved and by the old machine are different, then the nature and quality of the effect will be the criterion of the validity of the patent. It should be added, that there is no distinction between an improvement on a patented machine and on one that is not patented.-2. Qualities of Patentable Inventions. The essential qualities of a patentable invention are very broadly indicated in the statute. The terms employed in the act are "invented or discovered," "new and useful art, machine," etc., and the question, what constitutes a patentable invention, is therefore to be answered by referring to the adjudications of English and American courts, which constitute the common law of the patent system. It should be noted first, that "invented " and discovered" are synonymous in the patent law; “novelty” and “utility,” required by our statute, have always been held vitally essential qualities of patentable inventions; and the degree of novelty and utility-the "sufficiency of inven

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tion"-necessary to support a patent, has been determined by the courts in the numerous cases which have presented these questions for adjudication. The degree of absolute utility required in an invention is, however, slight. It is only necessary that the invention shall not be positively trivial, nor, on the other hand, noxious to public health or morals. The principal inquiry in patent law is therefore into the novelty of the invention, for the whole theory upon which the patent system rests, is that the patentee offers the world something new in consideration for his exclusive patent privilege. The novelty required by the American law is universal novelty, with the one exception that mere prior knowledge or use abroad will not defeat the rights of a native inventor, if the foreign invention has not been patented or described in any printed publication before the date of the American invention. The general principles governing the essential degree of novelty may be briefly summarized as follows: It is established in the early cases that a new use of an old thing-technically called a "double use "-is not patentable. Merely mechanical changes, or colorable variations, requiring no exercise of the inventive faculty; and, in general, alterations in the form or proportions of an existing device, can not be the subject of a patent. And while the invention itself, and not the mental process by which it was devised, is the real test of its patentability, it must still be observed that to support a patent the law requires it to appear that the invention is of such a nature as not to exclude the possibility of exercise of the inventive faculty in devising it. The terms "invented " and "discovered" mean that the subject of a patent must be a true invention or discovery, and not a mere mechanical improvement or substitution of a known "equivalent" involving mechanical skill or superior workmanship. But if the result, if the invention itself, is properly patentable, the law does not regard the mode of invention or discovery; and an accidental discovery or invention is, in the law, just as meritorious as one which is the result of laborious investigation and experiment. To satisfy the statute requirement of novelty, therefore, an invention must be substantially different from anything that has previously existed; and the criterion of the "sufficiency of invention" is the character of the invention itself, and not the degree of ingenuity or skill employed in devising it.—3. Qualifications of Patentees. The existing law provides for the issue of the patent in every instance to "the original and first inventor." A radical difference between English and American law exists on this point. In England the first importer of an invention is treated as an inventor, and may obtain a patent; but under our system the patent issues only to the inventor. The only discrimination in our law in favor of citizens of the United States, is the provision that mere prior knowledge in a foreign country shall not debar a native inventor from obtaining a patent for an invention devised

independently here, if at the time of making his application he really believes himself to be the first inventor. The foreign invention must have been patented or described in some printed publication prior to the date of invention in this country in order to deprive the native inventor of his patent. —4. Designs. Section 4929 of the Revised Statutes provides that "any person who by his own industry, genius, efforts and expense has invented and produced any new and original design for a manufacture, bust, statue, alto-relievo, or bas-relief; any new and original design for the printing of woolen, silk, cotton or other fabrics; any new and original impression, ornament, pattern, print or picture to be printed, painted, cast, or otherwise placed on or worked into any article of manufacture; or any new, useful and original shape or configuration of any article of manufacture, the same not having been known or used by others before his invention or production thereof, or patented or described in any printed publication, may, upon payment of the fees prescribed, and other due proceedings had, the same as in cases of inventions or discoveries, obtain a patent therefor." The term for which these patents are issued is either three and a half, seven or fourteen years, and the fees are, respectively, ten, fifteen and thirty dollars.-5. Procedure in the Patent Office. Since 1836 the whole business of issuing patents has been conducted by the patent office at Washington. Applications for patents are made to the commissioner of patents in accordance with a prescribed form, which consists of a petition for the allowance of the patent, and an oath that the applicant believes himself to be the first inventor, and that he does not know or believe that the invention was ever before known or used. These forms accompany the specification or description of the invention, which is by far the most important part of the application. The statute provides that the specification shall describe the invention in such "full, clear, concise and exact terms as to enable any person skilled in the art or science to which it appertains, or with which it is most nearly connected, to make, construct, compound and use the same." The object of this provision is to secure to the public the benefit of the invention after the expiration of the patent, which, as we have seen, is part of the compact between the patentee and the state. The specification concludes with the "claims," in which the inventor is required to "particularly point out and distinctly claim the part, improvement or combination which he claims as his invention or discovery." Drawings accompany the specification in all cases which admit of them, and the commissioner may require the applicant to furnish the patent office with a model or specimen, although these are now not often required. The application, on being filed in the office, is referred to the examiner or officer in charge of the department in which the invention is classed. The examiner then proceeds to make an examination of the 128 VOL. III. 9

invention, and of the patent office records, to ascertain whether it possesses novelty and utility. An examination of the records of foreign patent bureaus and of scientific works is also necessary, to ascertain whether the invention has been anticipated abroad, or whether it has been described in any printed publication. If from any of these sources anything is found which shows the invention claimed, or any feature of it, to be wanting in novelty, the applicant is notified by the examiner, and a report is sent him rejecting the application, stating specifically in what features novelty is lacking, and giving references to such prior patents or records as anticipate the invention. The applicant thus has an opportunity to amend his application so as to make it conform to the state of the art, and to eliminate the features that are not new. If the objection raised by the examiner is deemed groundless, the applicant may attempt, by argument or explanation, to remove it. In case of adverse decision, an appeal will lie from the decision of the primary examiner to an intermediate board, consisting of three examiners-in-chief; and if the applicant is still dissatisfied, he can bring his case before the commissioner of patents. If no objection is raised by the primary examiner, or if all objection is removed by amendment or overcome by argument, the application is allowed. The fee upon filing an application is $15; and upon the issue of the patent, $20. The final fee is required to be paid within six months after the allowance of the patent, and the specification is then printed, and the patent issued for the term of seventeen years from the date of its issue. — 6. Reissue and Disclaimer. A further proceeding, of which the patent office has jurisdiction after the issue of the patent, is the "reissue" of patents which are defective on their first issue, "if the error has arisen by inadvertence, accident or mistake." Where the patent is invalid by reason of a defective or insufficient specification, it is surrendered and sent to the patent office with a corrected specification; and in a proper case, on payment of the duty, a new or reissued patent, in accordance with the amended specification, is granted for the unexpired term of the original patent. These reissues were formerly issued with great laxity. But since the decision of the supreme court in Miller vs. Brass Co., 104 U. S., 350, the provisions of the statute have been observed, and the practice of repeatedly expanding patents by reissuing them is no longer possible. It should be added, that in cases where the inventor has inadvertently claimed in his original patent more than he is entitled to, the patent may be amended by filing a "disclaimer" of what is excessive, and the patent will then be valid for the residue. 7. Interferences. Where an application is filed which "interferes" with a pending application, or with a patent granted within two years previous to the filing of the application, an “interference" is declared. The parties to the interference are then required to file statements giving