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:
Aug. 23, 1977
Filed:
Oct. 06, 1975
Applicant:
Inventor:
Richard J Hovey, Sturbridge, MA (US);
Assignee:
American Optical Corporation, Southbridge, MA (US);
Primary Examiner:
Int. Cl.
CPC ...
G02F / ;
U.S. Cl.
CPC ...
3501 / ;
Abstract
A lens having an optical density which is variable under differing light conditions can be produced by imbibing a synthetic polymer lens such as a polycarbonate or diethylene diglycol bis allyl carbonate polymer with a solution of a metal dithizonate. A polarizing sheet can be laminated thereto or alternatively, a passive dye can be utilized on the inner surface of the lens to provide non-variable reduced optical density in the assembly.
Hovey, Richard. (1977). Photochromic light valve (U.S. Patent No. 4043637). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4043637
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile