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. 31, 1978
Filed:
Feb. 09, 1977
Masuo Tsuji, Suwa, JP;
Kabushiki Kaisha Suwa Seikosha, Tokyo, JP;
Abstract
An electronic timepiece having detecting and control circuitry for preventing a digital display from being driven by a DC energizing signal is provided. The detecting and controlling circuitry is coupled intermediate the decoder circuitry and driving circuitry in an electronic timepiece digital display arrangement and detects the presence or absence of an intermediate frequency signal being produced by the timekeeping circuitry and applied to the driver circuitry to effect AC driving of the digital display. In response to detecting the absence of an intermediate frequency signal applied to the driver circuitry, the detecting and controlling circuit prevents the decoder circuitry from applying to the driver circuitry decoded timekeeping signals for effecting driving of the digital display, and thereby prevents inadvertent DC driving of the digital display.