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:
Mar. 06, 1979
Filed:
Feb. 17, 1978
James B Armstrong, Phoenix, AZ (US);
J Robert Trimmier, Glendale, AZ (US);
Sperry Rand Corporation, New York, NY (US);
Abstract
An optical filter possessing narrow pass band characteristics selectively absorbs impinging ambient white light components and is used in combination with a laminate graticule having transparent electrodes lying in a common plane for defining a multiplicity of electrically insulating gaps in the pattern of the graticule for exciting associated partially over-lying electroluminescent phosphor patterns. The graticule pattern being composed of an electroluminescent material, night viewing of the graticule is readily accomplished by electrically exciting it. For daylight viewing, the unexcited phosphor material is itself directly viewed.