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:
Jul. 04, 1978
Filed:
Jan. 12, 1976
Akio Shimoi, Suwa, JP;
Kabushiki Kaisha Suwa Seikosha, Tokyo, JP;
Abstract
A digital display electronic wristwatch including a quartz crystal high frequency time standard having a natural frequency in the MHz range is provided. The quartz crystal time standard is incorporated into an oscillator circuit that produces a high frequency time standard signal having the same frequency as the frequency of vibration of the time standard. A divider circuit is formed from a plurality of series-connected divider stages and produces a low frequency reference signal in response to the time standard signal. Series-connected counters are coupled to the divider to produce time-keeping signals in response to the low frequency reference signal being applied thereto, and digital display elements are adapted to display time in response to the time-keeping signals produced by the respective series-connected counters.