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:
Nov. 02, 1976
Filed:
May. 22, 1975
Applicant:
Inventor:
Elliot Berman, Quincy, MA (US);
Assignee:
Exxon Research and Engineering Company, Linden, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
315154 ; 315158 ; 340 / ;
Abstract
An automatic variable lighting device is provided with light responsive means, such as a photocell, for controlling the voltage applied to the lamp in response to ambient light conditions so that a nearly constant contrast between lamp intensity and ambient light intensity results.