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US3802182A Expired / Lapsed US ⏱️ 0.0 years remaining

Timepiece with flickering digital display

Assignee: Suwa Seikosha KK
•
Filing: 1972-02-23
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Granted: 1974-04-09
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Expires: 1992-02-23
📄 Original PDF 🌐 Google Patents

Abstract

Abstract In an electronic timepiece using a digital display showing hours and minutes only, the fact that the timepiece is functioning can be evident by causing at least a portion of the digital display to flicker. The rate at which the flickering occurs is arranged to be close to one cycle per second, making it unnecessary to wait for periods as long as one minute in order to determine that the timepiece is functioning.

Inventors

  • 👤 K Fujita

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 06:12
CPC Classifications
G; G04; G04G; G04G9/00; G04G9/0082; G04G9/08; G04G9/12; G09; G09F; G09F9/00; G09F9/30; G09F9/302

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 136 words
In an electronic timepiece employing a liquid crystal digital display cell showing digitally only the hour and the minute, the improvement comprising electronic circuitry for causing at least a part of said display to flicker at a selected, controlled frequency said circuitry including oscillator means for supplying a high frequency time standard signal, a chain of frequency divider means for receiving said high frequency time standard signal and producing low frequency timing signals and an intermediate frequency signal, decoder means for receiving said timing signals from said divider means and actuating said digital display cell, circuit means for receiving said intermediate frequency signal and applying said signal to said part of said display cell to cause same to flicker at said intermediate frequency, said circuit means including at least one pair of complementary field effect transistors.
Claim 2
Dependent Claim 136 words
In an electronic timepiece employing a liquid crystal digital display cell showing digitally only the hour and the minute, the improvement comprising electronic circuitry for causing at least a part of said display to flicker at a selected, controlled frequency said circuitry including oscillator means for supplying a high frequency time standard signal, a chain of frequency divider means for receiving said high frequency time standard signal and producing low frequency timing signals and an intermediate frequency signal, decoder means for receiving said timing signals from said divider means and actuating said digital display cell, circuit means for receiving said intermediate frequency signal and applying said signal to said part of said display cell to cause same to flicker at said intermediate frequency, said circuit means including at least one pair of complementary field effect transistors.
Claim 3
Dependent Claim 37 words
The timepiece as defined in claim 1, wherein said display flickers at a frequency between a small submultiple and a multiple of 1 Hz, at a frequency between a small submultiple and a small multiple of 1H2.
Claim 4
Dependent Claim 41 words
The timepiece as defined in claim 1, wherein said digital display includes a colon between said hour display and said minute display and said part of said display which flickers is at least one of the two indicia comprising said colon.
Claim 5
Dependent Claim 14 words
The timepiece as defined in claim 1, wherein said flicker frequency is 1 Hz.
Claim 6
Dependent Claim 19 words
The timepiece as defined in claim 1, wherein said digital display is based on the use of liquid crystals.

References Cited (Backward Citations)

US2542021A Cited
US3505804A Cited
US3576099A Cited
US3613351A Cited
US3630015A Cited
US3672155A Cited
US3664118A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-04-08 1977-10-08 1978-04-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-04-08 1981-10-08 1982-04-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-04-08 1985-10-08 1986-04-09 $7700.00 Window Closed / Lapsed

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