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:
Dec. 22, 1981
Filed:
Jul. 13, 1978
Applicant:
Inventor:
Roy M Harrigan, Manchester, VT (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02F / ;
U.S. Cl.
CPC ...
350354 ;
Abstract
A negative photochromic material which is responsive to the ultraviolet portion of the daylight spectrum comprises part of the lens of a light fixture. The material which is of the normally dark type varies the translucence of the lens so that more lumens of light are transmitted through the lens under daylight lighting conditions than at night.