Inventions secured by letters-patent are property in the holder of the patent and as such are as much entitled to protection as any other property, consisting of a franchise, during the term for which the franchise or exclusive right or privilege is granted. Seymour v. Osborne, 11 Wall. [78 U. S.] 533. Holders of letters-patent enjoy, by virtue of the same, the exclusive right and liberty of making and using the invention therein secured, and of vending the same to others to be used, as provided by the act of congress passed for the purpose. 16 Stat. 201. Private property, the constitution provides, shall not be taken for public use without just compensation, and it is dear that that provision is as applicable to the government as to individuals, except in cases of extreme ■necessity, in time of war, and of immediate and impending public danger. Exigencies of the kind do arise where the prohibition does not apply to the public, and in such cases it must be conceded that the officer in the public service is not a trespasser, but it is equally true that the government is bound to make full compensation to the owner. Mitchell v. Harmony, 13 How. [54 U. S.] 134; U. S. v. Russell, 13 Wall. [80 U. S.] 627.
Letters patent [No. 72,360]3 for a new and useful improvement in the construction of boats for dredging under water were granted to the complainant on the 17th of December, 1867, as appears by the original patent annexed to the bill of complaint. Nothing is suggested to show that the patent is not regular in form, and the complainant alleges that the respondents are making and constructing a dredge-boat of the same construction as that described in his specification, and which is an infringement of his patent, and he prays for an injunction and for an account of all such gains and profits as they, the respondents, have received by their unlawful and wrongful acts and doings. Proofs were taken and hearing was had, when the respondents requested leave to amend their answer. Leave to that effect having been granted, and new proofs taken, the cause is now submitted, with additional briefs, to the court, upon the pleadings as amended, with all the proofs in the cause. Redress for the unlawful use of a patent cannot be obtained unless the party seeking it alleges and proves that he is the original and first inventor of the improvement, and that the patent has been infringed by the party against whom the suit is brought. Both of those allegations must be proved, but it is well-settled law that the patent, if regular in form, and introduced in evidence, affords a prima facie presumption that the alleged inventor is the original and first inventor of what is therein described as his improvement. Under such a rule nothing is here open for examination except the question of infringement and the defences set up in the answer. Seymour v. Osborne, 11 Wall. [78 U. S.] 538.
Considered together, the answer and the amendments’ thereto may be regarded as setting up the following defenses:—
1. That the complainant is not the original and first inventor of the improvement.
2. That M. D. McAlester furnished the plans- and sketches of the described dredging-boat, and that he was the real inventor of the improvement; that the said McAles-ter was the sole inventor of the same, and that the complainant fraudulently, wrongfully, and falsely represented himself as the original inventor, and that the patent was *1193■wrongfully and inadvertently issued In ignorance of the facts, and is wholly inoperative and void.
3. That the dredging-boat in question was built and completed under the inspection and supervision of an officer of the United States, according to the plans and specifications furnished by the government of the United States; and that the said plans and specifications were the result of the said officer’s own study, observation, and experience, and that to the extent that said plans and specifications were original in any particular, he was the author and inventor of the same.
Superadded to that, the respondents also allege that in building the said dredging-boat, and in following the said plans and specifications, they were the mere agents and executive hand of the federal government, which was the real constructor of the same, all the work thereon having been done under the immediate supervision, and in obedience to the orders, of the said government, and in conformity with the plans, specifications, and directions “which the said government furnished.”
Two claims are set up by the patentee:— 1. A dredging-boat, constructed with a series of water-tight compartments, so proportioned and arranged that, as they are filled with water, the boat shall preserve an even keel, and the dredging mechanism be brought into action without any adjusting devices. 2. He claims the combination of .the “mud fan” attached to a rigid shaft, and a boat containing a series of water-tight compartments; so adjusted as to cause the boat to settle on an even keel as the compartments are filled with water, and also a pump for exhausting all the water from the compartments.
Reference is made to the drawings as making part of the specifications, and the pat-entee states that the excavator consists of a strong boat, propelled by one or two propellers placed in the stem. Two propellers are preferred, as affording greater power, and rendering the boat more manageable when steering in crooked channels. Steam engines of ordinary construction are employed to drive the propeller in the usual manner. Near the bow of the boat is placed another steam engine, to. drive what the patentee calls the “mud fan,” which projects from the bow of the boat and in front of the same, and is formed by a set óf revolving blades, turned like those of the propellers, by a shaft passing through what is called a stuffing box in the specification. The blades for this purpose are shaped somewhat like those of a propeller, but the patentee states that they are sharper on their fronts, and less inclined on their face. These blades, he says, should extend about two feet below the bottom of the boat, their object being to displace the sand and mud on the bottom by their rapid revolution, and by stirring them up to mix the same up with the water-so that they may be carried off by the current, to which he adds, that the “mud fan” assists the propellers to draw forward' the boat as well as to stir up the mud and sand. All the engines, it is represented, may be driven by one set of boilers, placed midships, and in order that the “mud fan” may be brought in contact with the bottom, the patentee states that he constructs the boat with a. series of water-tight compartments, „ placed in the bow and stern, and on each side of the centre, midships, into which the water may be permitted to flow, through pipes, so as to sink the vessel to the required depth, the compartments being so placed and proportioned that the vessel shall sink with an even keel, by which the effective action of the “mud fan,” the propellers, and the steering apparatus, is preserved, leaving the boat manageable at any depth of water. Such is the general description of the boat, to which it is added, that a large pump, driven by the engine, is connected by pipes with all the compartments, so that the water may be pumped out when necessary to raise the boat. Argument to show that the invention was designed as an improvement in constructing a dredging-boat, and the apparatus to render such a boat an effective machine for that purpose, is unnecessary, as the proposition is supported by every line of the descriptive part of the specification.
Two suggestions are made, as tending to show that the complainant was not the original and first inventor of the improvement. 1. That its .construction and mode of operation are the same as the dredge-boat Enoch-Train, previously constructed, and publicly used in 1859, for the purpose of deepening the channel at the mouth of the river Mississippi. 2. That Gen. M. D. McAlester made the original plans and specifications described in the patent, and that he is the author and inventor of whatever is new and useful in the patented improvement.
Much discussion of the first suggestion is unnecessary, as it is quite clear that the evidence introduced by the respondents is not sufficient to show that the Enoch Train embodied the same construction and mode of operation as the patented improvement. Instead of that, the dear inference is, that it did not, and of course it is not sufficient to overcome the prima facie presumption that the patentee is the original and first inventor of what is secured to him by his patent. Nor is the proof introduced to support the second suggestion sufficient to warrant a finding, either that the person named made the plans and specifications, or that the complainant surreptitiously obtained the patent. Allegations, like those in the answer, that the plans and specifications were furnished by the agent of the government, and that the agent named was the inventor of the improvement, require to be proved before it can be admitted that they constitute a valid *1194defence to the charge of infringement. They are not proved in the case before the court, and consequently the defence must be overruled. Both propositions therefore are rejected, and the finding of the court on both of those points is in favor of the complainant. Suppose that is so, still the respondents insist that they worked under the federal government, and that the nature of a patent right is such that the sovereign power may use it at pleasure, or authorize third persons to use it for the public benefit. Support to that view is .certainly found in the authority cited by the respondents, and perhaps it may be assumed that such is the rule in the parent country. Feather v. Queen, 6 Best & S. 283.
[NOTE. The master to whom the matter was referred for the purpose of taking an account of the profits received by the defendants from the infringement reported the sum at $6,-604.82. Both parties excepted, but their exceptions were overruled, and a final decree, in accordance with the report, was rendered October 9, 1878, with costs; and from this both parties appealed to the supreme court, where Mr. Justice Bradley rendered an opinion reversing the decree of the circuit court, with instructions to dismiss the bill of complaint, holding that the letters-patent granted to the complainant below were invalid for want of novelty and invention; the placing of a screw for dredging at the stem of a boat, though qualified by the natural incidents and adjuncts of its application, being a principle not sufficiently substantial for patenting. Atlantic Works v. Brady, 107 U. S. 192, 2 Sup. Ct. 225.]By that case it is decided that the patent prohibits all of the subjects of the sovereign, except the patentee, from using the invention, but that it extends no further, and is not intended to deprive the government itself of the use of the invention. Patents in that country are monopolies, granted by the sovereign, and may be granted or refused in the royal discretion. Power to legislate upon the subject in this country is conferred upon congress by the constitution, by securing for limited periods to inventors the exclusive right to their discoveries. Congress has legislated, and the provision is, that persons who have made inventions of the kind specified in section 24 of the patent act [1870], may “obtain a patent therefor.” 16' Stat. 201. Every patent shall “contain- a grant to the patentee, his heirs or assigns, for the term of seventeen years, of the exclusive right to make, use, and vend the said invention or discovery throughout the United States.” Section 22, p. 201. Language so explicit and unambiguous admits of no exception, even if it would be competent for congress to reserve such a right to the government. Such an exception is not made, and cannot be implied. Conclusive support to that proposition is found in a recent decision of the supreme court (U. S. v. Burns, 12 Wall. [79 U. S.] 252), where the court say, speaking of an invention made by an officer of the United States, and secured by lettérs-patent, that “the government cannot, after the patent is issued, make use of the improvement any more than a private individual, without license of the inventor, or making compensation to him.” Nothing can be plainer than that proposition, for two reasons: 1. Because the invention, when thus secured, is property, and as such, is entitled to the same protection as any otherproperty. 2. Because private property cannot be taken for public use without just compensation except in cases of extreme necessity, in time of war, or of immediate and impending public danger. Nothing of the kind is shown in this case, and of course the case falls directly within the prohibition.
Sufficient appears to warrant the conclusion that the respondents were employed by the government to build a dredge-boat, but contractors of the government derive no power in a case like the present, by virtue of their contract, to take the property of private individuals without their consent, and to use and apply the same in fulfilling their contract obligations. Such a contractor may be the agent of the government to build’a ship or dredgerboat, but he is not the agent of the government to seize and appropriate whatever materials he may select to fulfil his obligations. Infringement is impliedly admitted, and the other defences set up in the answer are overruled. Were infringement not admitted, still the proofs are sufficient to sustain the bill of complaint, which is all that need be said upon the subject.
Decree for an account. The question of an injunction is deferred for further consideration.
[From 2 Ban. & A. 436.]