This is an appeal by the defendants from an interlocutory order of the circuit court for the southern district oí New York, which granted a preliminary injunction against the defendants for an infringement of the second claim of letters patent No. 171,-866, dated January 4, 1876, to Reuben Ritter, for an improvement in paper boxes, which are cut out of a single sheet of paper, and in which the sides interlock with each other by means of projecting flaps inserted into slots in the paper. The original adjudication upon the validity of the second claim of the patent was made by Judge Lacombf in Folding Box Co. v. Nugent, reported in 41 Fed. Rep. 139. The opinion contains a description of the patented device, and of the peculiarity of the projection and slots which the court found to be the subject of the claim. Upon the present motion, the circuit court followed its previous construction of the patent, “especially in view of the fact that no new defenses are interposed.” The appeal calls upon this court to state *232its position', as ah appellate court, in regard to motions of this character, and particularly with respect to the weight which is to be' given to the previous adjudication, which is generally the foundation of a preliminary injunction. The appellate court is to examine the interlocutory decision of the circuit court in the light of the affidavits, and of'the history of the patent, and the adjudications thereon, which were presented to that court. The adjudication upon which the motion for preliminary injunction was based, not being the subject of the appeal, it is to have' the same weight which it should have before the circuit court. But while the circuit court, upon a motion for an injunction, might deeih itself constrained, contrary to its own judgment,-to adopt the rulings of another circuit court upon questions of law made at final hearing, this court is at liberty to re-examine such rulings, dispose of the questions of law conformably to its own convictions, and accord to the former adjudications such weight as in its own judgment it was entitled to upon the motion. In the absence of some controlling reason for disregarding it, the former adjudication should have the same weight in this court which it has as the foundation for a- preliminary injunction before the circuit court. The effect which is to be given such adjudication in the circuit court is well stated in the syllabus of Mr. Justice Miller’s opinion in Purifier Co. v. Christian, 3 Ban. & A. 42, as follows:
“Where a patent has been established by a decision of a circuit court, after careful consideration, that decision is entitled to very great weight in a subsequent application, either before the same court or any other for a preliminary injunction or any preliminary relief.”
We concur in this statement of the law. Appeals from orders are not to be confounded with appeals from final decrees, and the rule which we have thus stated will not prevent our review of the adjudication itself, whenever it and the record upon which it was made shall be presented upon appeal. The tendency of any different rule would be to produce confusion, and convert the review of the interlocutory order into a review of the final adjudication upon which it was founded. Under this statement of the questions upon the appeal, we follow, upon this hearing, the construction of the second claim of the patent which was adopted by Judge Lacombe in the Nugent Case, and which sustained its novelty and patentability. His theory was that the second claim referred to a method of locking, whereby the flap projection is not hooked into a corner of the slot, but where the straight edge of the projection is engaged with the straight edge of the slot, “ such engagement taking place sometimes at one point, sometimes at another, and sometimes, again, throughout the entire length of the projection; in other words, as was stated in the decision which was appealed from, the patent was limited to' a locking device which operated by the engagement of a hooking device with a slot, not at a single point of contact, but where the hook and slot were so arranged as to be brought in contact straight edge to straight edge.” One advantage óf this method is that the fragile material of the box is not so easily torn as it is when the projection is hooked into a. corner or end of the slot, and a sudden strain is brought *233to bear upon one angular point. The question of infringement is thus the only substantial one which is to be disposed of upon this appeal.
The projecting portions of the retaining pieces in the defendants’ box are substantially the same as those which are shown in the second claim. One difference in the slots of the two devices is that the slot of the infringing box is at an angle with the vertical corner of the box instead of parallel with it. But the straight edge of the projection having also been altered, so that both the locking edge and the edge of the slot are parallel with each other, there is no difference in the mode of operation. Another, and apparently more important, difference is that a transverse slot has been added at the upper extremity of the locking slot. This change raises the question whether the locking in the defendants’ box is not performed by a hooking of the flap into the angle in the slot so that the engagement is at a single point of contact. But an examination of the box shows that a portion of the defendants’ slot is manifestly upon a straight edge with the projection, and that the strain is substantially along this portion of the slot which is parallel with the projection, and that the idea that the locking is caused by the hooking of the projection into the angle of the slot, though attractive at first sight, is not sustained by the facts. We concur with the circuit court upon the question of infringement, and its order is affirmed.