delivered the opinion of the Court.
This writ brings up for review the decree of the court below in a patent suit,
The bill alleges that the Splitdorf Electrical Company had infringed claims 7 and 8 of Kane patent No. 1,280,105, issued September 24, 1918, for a rigid unitary and integral support for mounting the various parts of an electrical ignition device. The original application was filed by Kane February 2, 1910, on which patent No. 1,204,573 was granted November 14, 1916. On October 24, 1914, Kane endeavored to amend his application by introducing six claims copied from Milton’s patent, issued May 12, 1914, for the purpose of securing an interference. The amendment was refused and Kane was directed by the examiner to file a divisional application if he desired to contest an interference with Milton. This was done. The Webster Company, however, acquired the rights of both Milton and Kane and through their attorneys conducted the proceedings for both sides in the Patent Office, resulting in an award of priority in favor of Kane.
Subsequently, in 1915, Kane filed a divisional application, presenting nine additional claims, copied from Podle-saks’ patent No. 1,055,076, issued March 4, 1913, and reissue patent No. 13,878, dated February 9, 1915; all of which claims were ultimately decided in favor of the Podle-saks. Thereafter, on June 17, 1918, an amendment was filed embracing the new and broader claims here in question, which were allowed upon an ex parte showing and,
It will thus be seen that claims 7 and 8 were for the first time presented to the Patent Office, by an amendment to a divisional application eight years and four months after the filing of the original application, five years after the date of the original Podlesak patent, disclosing the subject matter, and three years after the commencement of the present suit. A comparison of these claims, as set forth in the patent, with the claims in the original application, to say the least, leaves in doubt the question whether they were not so materially enlarged as to preclude their allowance on the original application.
Railway Co. v. Sayles,
We do not overlook the importance of not applying so narrowly the patent law as to discourage the inventor from exercising his creative genius, or the manufacturer or capitalist from assisting in the necessary work of bringing the invention into beneficial use; but it is no less important that the law shall not be so loosely construed and enforced as to subvert its limitations, and bring about an undue extension of the patent monopoly against private and public rights. In suits to enforce reissue patents, the settled rule of this Court is that a delay for two years or more will
“
invalidate the reissue, unless the delay is accounted for and excused by special circumstances, which show it to have been not unreasonable.”
Wollensak
v.
Reiher,
“ It follows from this, that if, at the date of the issue of the original patent, the patentee had been conscious of the nature and extent of his invention, an inspection of the patent, when issued, and an examination of its terms, made with that reasonable degree of care which is habitual to and expected of men, in the management of their own interests, in the ordinary affairs of life, would have immediately informed him that the patent had failed fully to cover the area of his invention. And this must be deemed to be notice to him of the fact, for the law imputes knowledge when opportunity and interest, combined with reasonable care, would necessarily impart it.
“ Not to improve such opportunity, under the stimulus of self-interest, with reasonable diligence, constitutes laches which in equity disables the party, who seeks to revive a right which he has allowed to lie unclaimed, from enforcing it to the detriment of those who have, in consequence, been led to act as though it were abandoned.
“ This general doctrine of equity was applied with great distinctness to the correction of alleged mistakes in patents, by reissues, in the case of Miller v. Brass Company,104 U. S. 350 . It was there declared, that where the mistake suggested was merely that the claim was not as broad as it might have been, it was apparent upon the first inspection of the patent, and, if any correction was desired, it should have been applied for immediately; that the granting of a reissue for such a purpose, after an unreasonable delay, is clearly an abuse of the power to grant reissues, and may justly be declared illegal and void; that, in reference to reissues made for the purpose of enlarging the scope of the patent, the rule of laches should be strictly applied, and no one should be relieved who hasslept upon his rights, and has thus led the public to rely on the implied disclaimer involved in the terms of the original patent; and that when this is a matter apparent on the face of the instrument, upon a mere comparison of the original patent with the reissue, it is competent for the courts to decide whether the delay was unreasonable and whether the reissue was, therefore, contrary to law and void.
“
This doctrine has been reiterated in many cases since, and at the present term has been reconsidered and emphatically repeated as the settled law, in the case of
Mahn
v.
Harwood,
In
Ives
v.
Sargent,
While the analogy bétween the case of a reissue patent and that of copying for interference is not always an exact one, it is sufficiently so, as applied to the present case, to make these decisions pertinent; and the principle which they announce is controlling. We brought this case here by certiorari because of the claim that the decision of the Court of Appeals rested primarily on
Chapman
v.
Wintroath,
If this were all, it might justify the conclusion that a hard and fast time limit of two years is to be applied in
Our conclusion, therefore, is that in cases involving laches, equitable estoppel or intervening private or public rights, the two-year time limit prima jade applies to divisional applications and can only be ayoided by proof of special circumstances justifying a longer delay. In other words, we follow in that respect the analogy furnished by the patent reissue cases.
Affirmed.
Notes
See also
American Laundry Machinery Co.
v.
Prosperity Co., Inc.,
