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:
Apr. 13, 1976
Filed:
Apr. 24, 1975
Applicant:
Inventor:
Hiroyuki Chihara, Okaya, JA;
Assignee:
Kabushiki Kaisha Suwa Seikosha, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G04C / ; G04B / ;
U.S. Cl.
CPC ...
58 2 / ; 5815 / ; 340249 ;
Abstract
A battery-powered quartz crystal timepiece is provided with a battery voltage detecting circuit utilizing the threshold voltage of a field effect transistor as a battery failure indicator. The voltage level at which failure is indicated may be selectively controlled by adjusting a load resistance value of the field effect transistor or a voltage divider intermediate the transistor and battery. The battery voltage detecting circuit may operate intermittently, the sampled output of the detecting circuit being stored in a memory circuit.