US3913312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state electronic timepiece
Assignee: Suwa Seikosha KK
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Filing: 1973-12-26
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Granted: 1975-10-21
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Expires: 1993-12-26
Abstract
Abstract An electronic timepiece having a liquid crystal display for displaying a time standard signal which is supplied thereto is provided. A light source for lighting the liquid crystal display is disposed proximate thereto. A time correcting circuit including manually operated switches is coupled to an electronic divider circuit which supplies the timing signal to the display to correct the displayed digits of time counted thereby. The time correcting circuit is provided with a safety switch which in a first position allows a correction switch to effect correction of a displayed digit and in a second position protects against inadvertent time correction and allows the lighting of the light source to make the digital display readable in the darkness.
Inventors
- 👤 Hitomi Numabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:59
CPC Classifications
G; G04; G04G; G04G5/00; G04G5/04; G04G5/043; G04G5/02; G04G9/00; G04G9/0023; G04G9/0029; G04G9/0047; G04G9/0052
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
135 words
An electronic timepiece having a liquid crystal digital display and comprising oscillator means for generating a relatively high frequency time standard signal; electronic divider means coupled to said oscillator means and adapted to supply low frequency signals to said digital display that are representative of present time in response to said high frequency time standard signal, a light source proximate to the display for illuminating same; safety switch means coupled to said electronic divider circuit and said light source, at least one manually operated correction switch selectively coupled through said safety means to said electronic divider means at a first mode of said safety switch means to effect time correction and being further coupled through said safety switch means to said light source at a second mode of said safety switch means to energize same.
Claim 2
Dependent Claim
135 words
An electronic timepiece having a liquid crystal digital display and comprising oscillator means for generating a relatively high frequency time standard signal; electronic divider means coupled to said oscillator means and adapted to supply low frequency signals to said digital display that are representative of present time in response to said high frequency time standard signal, a light source proximate to the display for illuminating same; safety switch means coupled to said electronic divider circuit and said light source, at least one manually operated correction switch selectively coupled through said safety means to said electronic divider means at a first mode of said safety switch means to effect time correction and being further coupled through said safety switch means to said light source at a second mode of said safety switch means to energize same.
Claim 3
Dependent Claim
40 words
An electronic timepiece having a digital display as claimed in claim 1, wherein said safety switch means includes a switching circuit means and a manually operated safety switch for setting said switching circuit means in said first and second modes.
Claim 4
Dependent Claim
23 words
An electronic timepiece having a digital display as claimed in claim 2, wherein said manually operated safety switch is a two position switch.
Claim 5
Dependent Claim
67 words
An electronic timepiece as claimed in claim 2, having at least one further correction switch coupled through said switching circuit means to said divider circuit means, each of said first mentioned and further correction switches being adapted to correct different digits of time, said switching circuit means being adapted to operatively couple said further correction switch to said divider circuit means only in said first mode thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |