
    Case lío. 3,236.
    CORNELL v. DOWNER & BEMIS BREWING CO. et al. SAME v. AMERICAN BUSH CO. et al.
    [7 Biss. 346;  2 Ban. & A. 514; 11 O. G. 331; 9 Chi. Leg. News, 142.]
    Circuit Court, N. D. Illinois.
    Jan. Term, 1877.
    Patent — What will be Consideued an INFRINGEMENT—EXTENT OF PATENTS.
    1. Where it is stated in a patent, “We do not wish to confine ourselves exclusively to the V shaped projection, ns any form that will prevent the core from turning, independent of the bush, will produce the same result,” the patentees are not to be confined to the mere ■form, but any other form substantially like that, although there may be a change, would be within the terms of the patent.
    2. Where there is a slight change in a machine, by which a new result is brought about, ■and which might be the subject of a patent, the invention should not be extended beyond the mere change, although the patent may be sustained, but where something elementary is discovered, and constitutes fairly a part of the invention of the patentee, no other inventor or -manufacturer ought to be permitted to use that elementary part without paying tribute to the first inventor or originator.
    In equity. The bill in these cases was filed [by George B. Cornell against the Downer & Bemis Brewing Company and others, and against the American Bush Company and others] upon the re-issues A and B, dated August Gth, 1872, of the original patent of Lacy & [G. B.] Cornell, of August 29th, 1S71 [No. 118,G17], for an improvement in bushes, and wrenches for their insertion in beer barrels. The claim of division A, No. 5,02G, is, “The wrench herein described, consisting of a shank A, plate B, projection D, and core B, the said core adapted to fit the opening through the bushing whereby the same is prevented from assuming an oblique position when being turned into place, substantially as described.” The claim of division B, No. 5,027, is, “The screw-threaded metallic bung-bushing, made tapering upon both its outer and inner sides, and protected with the flange B, having the V shaped notch d, by and for the purpose described.” A motion for a preliminary injunction was made on •the first bill and affidavits in support, and opposed, and after full argument an order was entered Eebruary 4th, 1875, granting such injunction, nisi, etc., and the .causes were brought to argument on pleadings and proofs in May, 187G.
    Goodwin, Offleld & Towle and J. W. Merriam, for complainant
    L. L. Coburn, for defendants.
   DRUMMOND, Circuit Judge.

In this case, everything must depend on the construction which shall be given to the patents which have been re-issued to the plaintiff. If the true construction is that contended for by the •defendants, then it can hardly be said that the defendants have infringed. I do not propose to consider these patents separate from each other, but, really, as constituting together substantially one patent, to accomplish a particular purpose. To be sure, there are two patents issued, and two claims made by Lacy and Cornell, but they were issued at the same time (the re-issues), and they refer to the same common object. If this were a suit upon the bung bush alone, without reference to the wrench, the court might possibly be disposed to take a different view of the matter; but looking at both together as in a certain sense one conjoint patent con.sisting of several parts, the question is, What is the true construction of the re-issued patent? Is it so narrow as that contended for .by the defendants? I hardly think that it is. It seems to me that the object was to make a bush of a particular kind, possessing certain attributes; and secondly, at the same ■time, to make a wrench which could be applied to the bush in a particular way, so as to insert it in the cask or ban-el. The qualities of the bush were, that it was to be metallic, with a screw on the outside, smooth on the inside, tapering both outside and in, ■and with a flange to press on the stave of the cask, and a device for the “engagement” of the wrench with it, by means of which it was to be inserted in the barrel. The wrench had a handle, its other end being expanded or flattened out, and a device was attached to it by which it could be engaged in the bush, and it was to possess a core which was to be inserted in the hole of the bush, and into which, when the bush was screwed in the ban-el or cask, a wooden plug or bung could be driven. Now, the question is, whether or not this was a patentable invention, and how far the invention extends. There can be no doubt, I think, that it was a patentable invention. If it be true that there were ¿bung bushes manufactured of metal and with a screw outside, and a flange, which was to rest upon the stave of the ban-el, there does not seem to have been a bush constructed like that of the plaintiff's, and which was to be inserted into the barrel by the same device or apparatus as his, viz: by a wrench with a shank, and a device to engage with the bush, and with a core constituting a part of the wrench which was to fit into the hole of the bush, and so, by the operation of revolving the bush in the barrel, to be inserted firmly, so as to make it tight, and in such a way that the operator could have complete control of the bush by means of the wrench, and pressing equally on all sides of the bush, one of the objects being to remove the core and insert a different sized one, when necessary, corresponding to the size of the bung bush.

I think, therefore, it was a patentable invention. As I understand, there never had been, before it was discovered by these parties, a bung bush with a wrench, such as are -described in these patents. The core, taking it altogether, seems to be an essential element of the device, and is one of the principal objects, and X should think, also, one of the principal excellencies of the whole device, because it enables the operator in inserting the bush into the cask, to command -completely the act of insertion. I agree with the counsel of the defendants, that the V shaped device in the bush, and the corresponding device in the wrench, are essential parts of the invention of the plaintiff and Lacy; but while that is so, the question is whether or not the plaintiff is restricted to ■the precise form in which the patent has set ■forth the device.

[NOTE. Por other cases involving this patent, see Cornell v. Littlejohn, Case No. 3,238; • also, Schumacher v. Cornell, 9C U. S. 549.]

There is a V shaped device in the bush, •and there is a corresponding one in the wrench, where the bush is to be inserted— •so that they engage together, and in this way the bush is inserted in the cask. While this is an essential part of the device, is the plaintiff limited to that precise form? If he is, then I suppose it may be admitted that the •defendants do'not in that particular infringe; because that identical form is not used by the defendants. A change is- made, but the bush is used substantially, as well as the wrench and the core, and another method is ■adopted by which the engagement takes .place between the wrench and the bush, so as to hold the bush fast while it is being inserted in the barrel. The main difficulty of this part of the case has been in reference to the particular device of the plaintiff. It is said in the patent, “We do not wish to •confine ourselves exclusively to the V shaped projection, as any form that will prevent the •core from turning, independent of the bush, will produce the same result.” They are not to be confined to the mere form, but any -other form substantially like that, although there may be a change, would be within the terms of the patent. I have come to the conclusion, after some hesitation, that considering the core was a very essential part of the mode of inserting the bush, and one of the objects which the inventor had in view was to enable the wrench, and the core, as a part of it, to engage with the bush so as to firmly turn the bush in the act of insertion — that the mere change in this-method of engagement, although varied in different ways, does not prevent the infringement of the substantial part of the plaintiff’s device. It is often very difficult in patent cases to determine the extent of the invention. Where there is a slight change in a machine, by which a new result is brought about, and which might be the subject of a patent, courts do not feel inclined to extend the invention beyond the mere change, although they may be inclined-to sustain the patent; but where something elementary, so to speak, is discovered, and constitutes fairly a part of the invention of the patentee, then I do not think that any other inventor or manufacturer ought to be permitted to use that elementary part without paying tribute to the first inventor or originator. Such I regard the core in this case. I .think that belongs to the plaintiff, and that it is not right or just for any one to use it without his consent. What I mean is, that the defendants are prevented from using such an arrangement with the core in it, so as to engage it with the bush of the plaintiff, and by which, if done, there is an infringement of the plaintiff’s patents.

Decree entered for plaintiff for perpetual injunction, with reference to the master to assess damages.  