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. 25, 1981
Filed:
May. 07, 1979
Thomas H Garland, El Monte, CA (US);
Michael T Zimmerman, Arcadia, CA (US);
Bell & Howell Company, Chicago, IL (US);
Abstract
Light is selectively gated with an array of electrically switchable illuminated light gates in an electrooptically active solid-state material displaying field-induced and photoinduced birefringence between a light polarizer and a complementary light analyzer. The illuminated light gates are selectively switched through field-induced birefringence by selective application of externally provided electric potentials, until photoinduced birefringence occurs in the light gate array. Such photoinduced birefringence is neutralized by illuminating the light gates in circumvention in either the polarizer or the analyzer while maintaining externally provided electric potentials away from the light gates.