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. 25, 1980
Filed:
Jul. 28, 1978
Applicant:
Inventor:
Singo Ichikawa, Sayama, JP;
Assignee:
Citizen Watch Company Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G04B / ; G04C / ; G04C / ;
U.S. Cl.
CPC ...
368 66 ; 368187 ; 368243 ;
Abstract
In an electronic wristwatch having a digital type of photo-electric display and powered by a battery, a battery life warning system is provided whereby the battery voltage is checked at periodic intervals and the photoelectric display is caused to flash on and off repetitively to indicate the approach of the end of the battery life. The timing of sampling pulses applied to a voltage detection circuit is controlled such that a temporary drop in battery voltage does not cause a display warning signal to be generated.