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:
Apr. 15, 2003
Filed:
Sep. 11, 2000
Edward A. Bernheim, Corpus Christi, TX (US);
Benjamin W. Raglin, Mathis, TX (US);
Exxene Corporation, Corpus Christi, TX (US);
Abstract
A method and apparatus for the stabilizing of napthopyran and spiroxazine photochromic dye in a coating or plastic media is presented. As prolonged exposure to light causes degradation of the photochromic properties of the dyes, a two-tiered layering system is utilized in which a hindered amine stabilizer (HALS) and/or an ultraviolet light (UV) absorber, is placed as a clear coat layer above a bottom layer containing the photochromic dyes. The bottom layer is constructed containing the photochromic dyes by either a coating of a surface of a lens or an imbuing of the photochromic dyes into the lens material, and can further optionally contain a HALS and/or UV blocking compound itself.