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. 04, 1981
Filed:
Dec. 03, 1979
Applicant:
Inventor:
Singo Ichikawa, Tanashi, JP;
Assignee:
Citizen Watch Company Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G04C / ; G04B / ;
U.S. Cl.
CPC ...
368 82 ; 368201 ;
Abstract
An electronic timepiece is equipped with a frequency division ratio adjustment circuit controlled by switch means, for producing a running rate correction signal that is aperiodically added in frequency to the output of a standard frequency oscillator, to correct the running rate of the timepiece, and is provided with externally controlled gate means for inhibiting this aperiodic frequency addition, so that the actual frequency of the standard frequency oscillator may be measured by means such as an external monitoring device which detects a display drive or modulation signal frequency through electrostatic or electromagnetic coupling to the timepiece display.