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. 28, 1981
Filed:
Sep. 25, 1979
Robert L Elving, Anaheim, CA (US);
Randolph S Carlson, Irvine, CA (US);
Other;
Abstract
An illumination control device for regulating the illumination in a controlled lighting area responds to natural illumination to control artificial lighting. The illumination control device turns the artificial light on and off at independently variable natural illumination levels to provide a hysteresis between the turn-on and turn-off points of the artificial lights. In addition, a variable time delay is included in the illumination control device to delay the turn-off of the lights for a variable period of time after the natural light level has risen above the level required for artificial light turn-off. Furthermore, the illumination control device includes a circuit for turning on all of the lights, regardless of the natural illumination level, when the circuit is initially energized so that the lights can be checked by maintenance personnel.