bilier Condenser Corp., 59 F. (2d) 305, 309, and petitions to this Court for certiorari were denied, 287 U. S. 648, 650. More than eight months after the denial, of certiorari respondents filed, in the Patent Office, purported disclaimers of each of the claims thus held invalid, and more than a month later began the present suit in the district court for Maryland to restrain infringement of the same claims and other claims of the same patents not previously adjudicated. A motion to dismiss the suits as to both patents for unreasonable delay in filing disclaimers of the claims previously held invalid, and because the disclaimers were inadequate, was granted by the District Court upon the latter ground.
The Court of Appeals for the Fourth Circuit reversed and ordered a new trial, 77 F. (2d) 556,. holding that respondents were not barred from maintaining the second suit, against different defendants, for infringement of 'the claims previously held invalid and that the disclaimer of those claims was not' prerequisite to maintenance of the suit upon the claims not previously adjudicated. It intimated that the second suit could not be maintained unless brought without unreasonable delay, but it concluded that it could not say that there had been unreasonable delay in the present case.
Whether the respondents’ disclaimers are merely an attempted formal alteration of the claims so as to conform them more precisely to the specifications without changing their substance or conceding their invalidity, see Carnegie Steel Co. v. Cambria Iron Co., 185 U. S. 403, 435, or whether they are in effect such alterations of the substance of the claims as to bring them within the requirements and limitations of the re-issue statute, R. S. § 4916, 35 U. S. C. 54, so as to render both the old and the new claims invalid, see Altoona Publix Theatres, Inc. v. American Tri-Ergon Corp., 294 U. S. 477, 490-492,