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:
May. 20, 2025
Filed:
Nov. 07, 2019
Transitions Optical, Ltd., Tuam, IE;
Joseph D. Turpen, Tuam, IE;
Elizabeth A. Zezinka, Cranberry Township, PA (US);
Emily Amond, Allison Park, PA (US);
Anu Chopra, Pittsburgh, PA (US);
Michael Frank Haley, Glenshaw, PA (US);
Beon-Kyu Kim, Gibsonia, PA (US);
Sujit Mondal, Gibsonia, PA (US);
Nicholas J. Parise, Pittsburgh, PA (US);
Brian Shaughnessy, Kilmaine, IE;
Robert W. Walters, Murrysville, PA (US);
Wenjing Xiao, Murrysville, PA (US);
An-Hung Yeh, Mars, PA (US);
Transitions Optical, Ltd., Tuam, IE;
Abstract
The present invention relates to a photochromic article that includes a substrate and a photochromic layer formed from a curable photochromic composition. The photochromic composition includes a polyol component that includes a polycarbonate diol, an isocyanate component that includes an unblocked polyfunctional isocyanate and/or a blocked polyfunctional isocyanate, and at least one photochromic compound. The equivalents ratio of blocked/unblocked isocyanate equivalents of the isocyanate component to hydroxyl equivalents of the polyol component is at least 5:1. The photochromic article exhibits a T(Fade Half Life) at 23° C. of less than or equal to 70 seconds.