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
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)
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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 |