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December 1, 1863


THIS was a bill filed in the Circuit Court for the Western District of Pennsylvania, to restrain the infringement of a patent for protecting the manufacture of a certain sort of door-locks, called Janus-faced locks, and for an account; the parties to the suit being two large manufacturing firms in the city of Pittsburg. The history of the invention or claim of invention in question, was essentially thus: Till within a few years past most of the door-locks used in this country, were imported from England. It was thought desirable, therefore, to have, invent, or use some plan by which this article could be obtained more cheaply and better than the imported, notwithstanding the higher price of labor here; the article of door-locks being one of immense consumption in this country. This object was in part effected by making the locks of cast iron; but some difficulty in the way of these cheaper productions was thought to exist in the fact that door-locks had to be made 'right and left,' and that a lock made for a right-hand door had to be turned upside down in order to be used on a left-hand door, and vice versa. It was conceived, therefore, that if this difficulty of right and left hand locks was obviated, and every lock made equally capable of use on right or left hand doors, an advantage might be gained. An American, named Sherwood–under whom the complainants claimed conceiving that he had invented a mode of effecting the object, and that finishing a lock on both faces was an invention and proper subject for letters, procured a patent in 1842 (extended in 1856), and established a manufactory of this sort of lock. His patent was for 'a new and useful improvement in door-locks.' The language of his schedule was as follows: 'What I claim as my invention, and for which I desire an exclusive right by letters patent, is, making the cases of door-locks and latches double-faced, or so finished that either side may be used for the outside, in order that the same lock or cased fastening may answer for a right or left hand door, substantially as described. 'I also claim the peculiar construction and double action (upon an inclined and horizontal track or way) of the locking car B, as hereinbefore described, and the combination of the locking car B and safety cars G G*fn1 2 with one another, and with the connecting or vibrating bar and bolt A, as within described, so as to fasten the bolt c securely and prevent its being picked. 'I also claim so constructing the bolt as hereinbefore described, that by simple turning it over in the lock-case, it is adapted to a right or left-hand door.' But the two improvements claimed in the second and third of these claims, were superseded soon after Sherwood had obtained his patent, by the invention of a certain Calvin Adams,–this Adams being a member of the firm who were the defendants in this suit. He, applying his improvement in the specific internal arrangement to the case of the lock, as Sherwood had claimed and obtained a patent for that, made a new combination, called the Janus-faced lock, whose manufacture, the complainants–successors to Sherwood's rights–had brought this bill to restrain and have an account of. It was not proved nor argued that the defendants had used any part of Sherwood's patent, except the double-faced casing. In fact, no locks with the particular internal mechanism specified in Sherwood's patent were ever made, except one or two made by Sherwood himself. The defendants below answered the bill, admitting that they had made locks of the kind described in the patent, and claiming that they were the rightful owners of that patent from Sherwood, and therefore had a right to manufacture those locks. Upon this issue considerable testimony was taken, when the defendants becoming satisfied that they were not the legal owners of the patent, asked leave to amend their answer by denying that they had ever made locks of the kind described in it; and by asserting that the patent was invalid for want of novelty. The Circuit Court permitted them to assert the invalidity of the patent as wanting novelty, but refused to allow them to deny that they had manufactured the locks described in it. The admission that they had manufactured them stood, therefore, on the record as it came up to this court. On the trial below–under the defence of want of originality great numbers of locks were brought into court, many of which were older than Sherwood's, and were undoubtedly cased on both sides. Certain ones were particularly relied on: two from the gates of the New York City Hall; one from the Custom House in that city; one or more from the City Hospital, and one from the gate of St. Mark's Church. Several manufacturers of reputation, who were offered as experts, testified that in their opinion these were not essentially different in principle from Mr. Sherwood's lock. The counsel below for Sherwood's patent argued, however, that no one of these locks had been made with an intention to obviate the difficulty of having right and left hand locks, or that practically any of them had been so used, or that any person, before Sherwood, in seeing one of them, had thus applied them, or perceived that they could be so applied. He contended, with a greater or less degree of force, that the Custom House lock was, in fact, from an open outdoor gate; that its inside was covered tight, in order to preserve the works of the lock from the weather and from rust,–a device necessary in all outdoor gate locks; that it was not well suited for a Janus-faced lock, and was finished on one side only; that it was a left-hand lock, and not a door-lock properly speaking, at all. The lock taken from the City Hospital gate, he argued, was a dead lock, a right-hand lock; though he admitted, that by putting it wrong side out, and making some alterations, it might be converted into a left-hand dead lock. The same he thought was to be said of the gate-lock of St. Mark's Church, and of all the others. The Circuit Court reporter, in reporting the case, says, however (see Legal Intelligencer, vol. xviii, p. 293): 'And yet undoubtedly to the eye of high inventive genius, the finished production of Sherwood was visible in nearly every one of these ruder productions. It required but the vital spark of genius to kindle the train, and to convert, in an instant, the manufacture designed for one purpose, into an object applicable to quite another.' The question, of course, was one, in a large degree, of inspection. The locks which were exhibited below, having been made exhibits in the case, were now all exhibited here. The Circuit Court entirely sustained Sherwood's claim; remarking, that although the makers of these other locks were near inventing the 'double face,' and might have done so,–if they had only thought of it,–yet that these persons had not actually invented it, or certainly had not so done it as to make their discovery practically useful. The testimony of the experts, the court conceived, 'when analyzed, amounted to this, and no more: that these gate-locks, being covered on the inside, might, by a little change, have been made into Janus-faced locks, though not so intended by the maker,'–a fact which was now apparent to any mechanic who had the patented invention before him. The injunction prayed for was accordingly granted, and a reference for an account ordered. The injunction restrained the defendants from 'making, constructing, vending, or using in any way the said invention and improvements, or either of them, or any part thereof, mentioned and described in the said patent.'Upon the coming in of the account as settled by the master, the account being settled in part upon proofs adduced by the complainants as to the fact and extent of the defendants' manufacture of these locks, the original admission being apparently not relied on,–it appeared that the net profits upon all the locks (including every part of the locks), which the defendants made or sold, were $13,282.92. The complainants claimed this entire sum; and indeed that it should be 'trebled.' The defendants denied that they were liable to profits on the whole lock, or for any profits except those properly springing from the case of the lock; that part of it alone of which Sherwood claimed to be the inventor, and of which, notwithstanding their resistance, he had just been declared by the court the rightful patentee. They contended that the court should apportion this sum of $13,282.92, reported as their profits, to the different parts of the lock; the profits on each part being fixed on an arithmetical proportion to the cost of each. The account, then, would stand thus: Profits on .the case (the "improvement" for which Sherwood

The opinion of the court was delivered by: Mr. Justice Miller delivered the opinion of the court:

got his patent),. $3,123 48

' latch and keeper,. 1,221 53

" other parts of the lock,. 4,577 01

" trimmings,......._4,360 90

$13,282 92

The said Circuit Court, however, was not of this opinion; conceiving that although a patentee might describe his invention as an improvement, still, if the machine constituted a distinct machine,–a specific article known in the market,–on account of its peculiar functions, the measure of damages for infringement was the profit on the whole machine. The view was thus set forth by the judge delivering the opinion of that court:

'The great question recurs: Is this Janus-faced lock a peculiar and distinct machine, introduced into market as a cheaper and better article than other machines without the peculiar characteristic of the patented one? Does the value of the patent to its owners consist in the close monopoly of the right to make and sell this species of lock as one individual machine? Has it peculiar characteristics which distinguish it from other machines of the same genus, and which give it a peculiar value in the market? If so, the complainants have a right to demand that the defendants, having infringed their exclusive right to make and sell this peculiar machine or manufacture, are justly liable to refund all the net profits made by such infringement. If, on the contrary, the patent is for some addition or improvement on an old and well-known implement, or some separate part or device thereof of small importance compared with the whole,–if the license to use the improvement or addition was sold as separate and distinct from the whole machine, the measure of damage would be the price of a license, and not the profit made by the exclusive right to make and sell the whole machine.'

[The Circuit Court next stated that Court's idea as to the originality and merits of the invention, and continued]:

'The claim of the Sherwood patent was, for 'making the case of door-locks and latches double-faced, or so finished that either side may be used for the outside.' The arrangements of the internal parts of the lock, and devices necessary to such a lock, are set forth in the specification. They were rather complex, and required that, in order to change the lock from a right-hand to a left-hand lock, that it should be opened and some change made in the position and arrangement of the internal parts For the purpose of the present discussion it is unnecessary to describe these devices. The name 'Janus-faced' locks was given to this machine to distinguish it from others which had not its peculiar qualities.

'Now, it is evident, that although the patent of Sherwood may be said to be for an improvement in the manufacture of locks, a well-known implement or machine; nevertheless, the lock contrived by him was a new and distinct species, having certain qualities differing from all other locks; that the Janusfaced lock is a specific article (although of the genus lock), known in the market, having peculiar value; and that the value of the monopoly granted by the patent consisted in the exclusive right to manufacture this peculiar machine without any competition, and have all the profits of such a monopoly. The respondents have made large gains by trespassing on the rights of the complainants. The profits they made by this trespass justly belong to the true owner. They have partaken equally with the complainants in the profits of the monopoly granted to them alone, without license, and in defiance of their rights. The only measure of the redress to which the complainants are entitled is an account of the actual profits made by respondents. The machine being a unit,–a specific article well known in the market, having peculiar value because of the patentee's discovery or invention, the attempt to arbitrarily divide the profits of the monopoly of the whole machine among its parts is without precedent, and receives no countenance from the case of Seymour v. McCormick,*fn2 1 which has been relied on for an opposite idea.'

The court accordingly confirmed the master's report giving to the complainants the whole profits, $13,282.92; and decree was entered accordingly.

Appeal to this court now brought before it,––

1. The originality of Sherwood's invention as set forth (ante, p. 157) in his first claim,–the claim, to wit, in these words: 'What I claim as my invention, and for which I desire an exclusive patent, is making the cases of door-locks and latches double-faced, or so finished that either side may be used for the outside, in order that the same ...

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