The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 24, 2023
Filed:
Feb. 17, 2021
Transitions Optical, Inc., Pinellas Park, FL (US);
Michael F. Haley, Glenshaw, PA (US);
Linda K. Anderson, Allison Park, PA (US);
Anthony T. Gestrich, Pittsburgh, PA (US);
David B. Knowles, Apollo, PA (US);
Stephen Robinson, Murrysville, PA (US);
Feng Wang, Export, PA (US);
Elizabeth A. Zezinka, Cranberry Township, PA (US);
Transitions Optical, Inc., Pinellas Park, FL (US);
Abstract
A curable photochromic composition can include: (a) a first component having a first compound with at least two active hydrogen-functional groups and an active hydrogen-functional group equivalent weight of at least 1000; (b) a second component having at least one of a polyisocyanate and a blocked polyisocyanate; and (c) at least one photochromic compound. The ratio of total isocyanate and blocked isocyanate group equivalents of the second component to total active hydrogen-functional group equivalents is at least 4:1.