Upon an appeal from a preliminary injunctional order, such as the one before us, our study of the record is limited in its scope. No exercise of discretion on our part is involved. It is' the exercise of judicial discretion by the District Court which is the subject of review. If its discretion was not abused, or stating it differently, if its discretion was not improvidently exercised, its injunctional order will not be reversed upon appeal. Alabama v. United States, 279 U. S. 229, 230, 49 S. Ct. 266, 73 L. Ed. 675.
Notwithstanding the vigorous and somewhat impressive assault which appellants' counsel make on all the patents in suit, they labor, we believe, under a mistaken notion of this court’s duty on appeals of this character. The District Court has not disposed of the question with any finality. Its order may at any time be modified or vacated. Appellants’ strong reliance upon the recently decided case by the English Privy Council, which held invalid certain patents almost identical with the ones under consideration, may be called to the District Court’s attention upon a motion to modify its order.
*576There are at least two good reasons why the order in this ease should not be set aside on appeal.
The parties could have litigated the case on its merits without much delay, and one appeal, instead of two, would have settled the questions presented by the attack on the validity of the patents.
Moreover, persuasive support for the injunctional order is to be found in the fact that the more important claims in these same patents were fully contested in another suit tried by the same judge and decided by him in favor of appellee. The infringer in that suit, though amply able to prosecute his appeal, acquiesced in the decree.
Under these circumstances, we find ourselves not disposed to disturb the discretionary order made by the District Court, nor to pass upon the validity of the claims until all the evidence is before us.
There may be cases where a patent’s invalidity is apparent on its face, in which ease the appellate court should set aside a temporary in junctional order to restrain its infringement, as an abuse of discretion by the trial court. But the patents (at least the important one before us) are not of that class. Then, too, the District Courts generally refuse to issue injunctional orders in contested eases, unless there has been some adjudication upholding the validity of the patent. But here again the instant case differs from the supposititious one, for these patents have been sued on, contested, and upheld after full hearing. Nor are we prepared to say that discretion has been abused in all cases, where injunctional orders were issued without a showing that the patent had secured judicial approval in a contested ease.
The order is affirmed.