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:
Sep. 25, 1984
Filed:
Feb. 18, 1983
Fuminori Suzuki, Tanashi, JP;
Citizen Watch Company Limited, Tokyo, JP;
Abstract
An electronic timepiece is provided with a temperature compensation system which combines precise control of the timebase oscillator circuit frequency over a narrow temperature range with control of the frequency divider circuit operation to provide relatively large step changes in compensation, thereby providing accurate temperature compensation over a very wide temperature range. Data for control of this compensation is produced by computing the square of a data value which varies proportionally with temperature, with the resultant data being adjusted to provided compensation control which exactly matches the temperature characteristic of the timebase oscillator circuit.