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:
Jun. 24, 1980
Filed:
Jul. 27, 1977
Tadashi Hanaoka, Koganei, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Abstract
An illumination device for an electronic timepiece equipped with an electro-optical display device and a battery as a power source, which comprises: an electro-luminescent sheet disposed at the lower surface of said electro-optical display device; a booster circuit for converting the battery voltage to an AC voltage; and an illumination switch for operating said booster circuit in response to the manipulation of an external control member; whereby said electro-optical display means is illuminated when said electro-luminescent sheet is rendered light emissive in response to manipulation of said illumination switch.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile