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:
Oct. 04, 1977
Filed:
Dec. 05, 1974
Hiroyuki Chihara, Okaya, JA;
Hitomi Numabe, Suwa, JA;
Kabushiki Kaisha Suwa Seikosha, Tokyo, JA;
Abstract
An electronic timepiece wherein the period of the timekeeping signal produced by the divider circuit is adjusted in response to an externally applied reference signal is provided. The electronic timepiece includes an oscillator circuit for producing a high frequency time standard signal, a divider circuit including a plurality of series-connected divider stages adapted to produce a low frequency timekeeping signal in response to the time standard signal, and a display for displaying time in response to the timekeeping signal. A receiving circuit receives an externally applied reference signal corresponding to actual time, and a comparator circuit compares the high frequency time standard signal against the reference signal and in response thereto produces a frequency difference signal. A memory circuit is adapted to store the frequency difference signal. A division ratio regulation circuit in response to the frequency difference signal stored in the memory circuit regulates the division ratio of the divider circuit to thereby produce a timekeeping signal representative of actual time.