US3838566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state watch having coarse and fine tuning
Assignee: TIME COMPUTER
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Filing: 1973-06-13
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Granted: 1974-10-01
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Expires: 1993-06-13
Abstract
Abstract Disclosed is a solid state electronic wristwatch having an electro-optical display in the form of light-emitting diodes. The display is energized from a high frequency quartz crystal oscillator by way of a frequency divider and a display actuator. The oscillator is provided with both coarse and fine tuning capacitors which are preset to provide increased time-keeping accuracy.
Inventors
- 👤 Connor A O
- 👤 J Pere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:31
CPC Classifications
G; G04; G04G; G04G17/00; G04G17/02; G04F; G04F5/00; G04F5/04; G04F5/06; G04G5/00; G04G5/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
A wristwatch comprising a watch case having a removable portion and a viewing window, an electro-optical digital seconds display in said case and viewable through said window, a crystal controlled oscillator in said case acting as a substantially constant frequency time base source for said seconds display, said crystal controlled oscillator including both coarse and fine variable tuning capacitors, said find tuning capacitor being located adjacent said removable portion of said watch case for ready access and ease of adjustment.
Claim 2
Dependent Claim
80 words
A wristwatch comprising a watch case having a removable portion and a viewing window, an electro-optical digital seconds display in said case and viewable through said window, a crystal controlled oscillator in said case acting as a substantially constant frequency time base source for said seconds display, said crystal controlled oscillator including both coarse and fine variable tuning capacitors, said find tuning capacitor being located adjacent said removable portion of said watch case for ready access and ease of adjustment.
Claim 3
Dependent Claim
21 words
A wristwatch according to claim 1 wherein said fine tuning capacitor is set to approximately the midpoint of its tuning range.
Claim 4
Dependent Claim
19 words
A wristwatch according to claim 1 wherein said removable portion of said watch case comprises a remoVable back plate.
Claim 5
Dependent Claim
48 words
A wristwatch according to claim 3 including a frame in said case, said coarse tuning capacitor and said seconds display being mounted on the side of said frame adjacent said viewing window, said fine tuning capacitor being mounted on the side of said frame adjacent said back plate.
Claim 6
Dependent Claim
20 words
A wristwatch according to claim 4 including a power supply in said case between said frame and said back plate.
Claim 7
Dependent Claim
16 words
A wristwatch according to claim 1 wherein said seconds display comprises a plurality of light-emitting diodes.
Claim 8
Dependent Claim
16 words
A wristwatch according to claim 1 wherein said seconds display comprises a plurality of liquid crystals.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |