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:
Jul. 31, 2001
Filed:
Nov. 06, 1998
Applicant:
Inventors:
Robert W. Walters, Pittsburgh, PA (US);
Cletus N. Welch, Murrysville, PA (US);
John W. Burgman, Gibsonia, PA (US);
Debra L. Singer, Wexford, PA (US);
Shanti Swarup, Allison Park, PA (US);
Assignee:
PPG Industries Ohio, Inc., Cleveland, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 5/942 ; B32B 2/738 ;
U.S. Cl.
CPC ...
C08G 5/942 ; B32B 2/738 ;
Abstract
Described are photochromic epoxy resin coatings that meet commercially acceptable “cosmetic” standards for optical coatings. Also described are articles having such coatings. The coatings exhibit a Fischer microhardness of from 50 to 150 Newtons per mm,and desirable photochromic properties, i.e., the formation of darker activated colors and faster rates of photochromic activation and fade when irradiated with ultraviolet light.