Patent US4128993A successfully refreshed from Google Patents.
US4128993A
Expired / Lapsed
US
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Zero adjustment in an electronic timepiece
Assignee: Sharp Corp
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Filing: 1975-08-15
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Granted: 1978-12-12
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Expires: 1995-08-15
Abstract
Abstract Zero adjustment of second information in an electronic timepiece is carried out upon receiving a command from the operator. "Increment one" is performed upon minute information when the second information is between 24 and 59 seconds when the zero adjustment command is generated. Minute information is not changed when the second information is between 0 and 23 seconds when the zero adjustment command is generated.
Inventors
- 👤 Hidetoshi Maeda
- 👤 Mitsuo Morihisa
- 👤 Takehiko Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:16
CPC Classifications
G; G04; G04G; G04G5/00; G04G5/04; G04G5/041
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
In an electronic time piece which comprises a time information calculation circuit including second and minute counters and a zero adjustment control circuit, the improvement comprising: a zero adjustment command switch; a determination circuit responsive to the condition of said second counter of said time information calculation circuit for determining whether in a given 60 second interval of from zero to 59 seconds, the second count has a value between zero seconds and a predetermined value less than 30 second representative of a characteristic boundary between fast and slow error conditions of said timepiece; and an increment signal generation circuit selectively driving said minute counter to increment by one the count therein in response to depression of said zero adjustment command switch coincident with a determination by said determination circuit that said second count is between said characteristic boundary value and 59 seconds.
Claim 2
Dependent Claim
143 words
In an electronic time piece which comprises a time information calculation circuit including second and minute counters and a zero adjustment control circuit, the improvement comprising: a zero adjustment command switch; a determination circuit responsive to the condition of said second counter of said time information calculation circuit for determining whether in a given 60 second interval of from zero to 59 seconds, the second count has a value between zero seconds and a predetermined value less than 30 second representative of a characteristic boundary between fast and slow error conditions of said timepiece; and an increment signal generation circuit selectively driving said minute counter to increment by one the count therein in response to depression of said zero adjustment command switch coincident with a determination by said determination circuit that said second count is between said characteristic boundary value and 59 seconds.
Claim 3
Dependent Claim
31 words
The electronic time piece of claim 1, wherein said timepiece is of the digital quartz oscillator type and said characteristic boundary value between fast and slow error conditions is 23 seconds.
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) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |