US4237548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic timepiece
Assignee: ETS SA A SWISS CORP
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Filing: 1979-02-01
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Granted: 1980-12-02
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Expires: 1999-02-01
Abstract
Abstract Electronic timepiece having an electro-optic passive display cell comprising an oscillator used as a time base and an electronic control circuit of its several functions. The electronic circuit is operable by means of a stationary key or switch, having a capacitive action, carried by the glass or crystal of the timepiece. The stationary key is fed by the oscillator through a fixed or non-variable condenser. A conductive element is interposed between the stationary key and the display cell, the conductive element constituting one of the electrodes of the fixed condenser. The purpose of this arrangement is to eliminate the influence of a parasitic condenser constituted by the electrodes of the display cell and the electrode of the stationary key.
Inventors
- 👤 Jean Fellrath
- 👤 Jean-Felix Perotto
- 👤 Ali Schneiter
- 👤 Maurice Grimm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:09
CPC Classifications
G; G04; G04G; G04G21/00; G04G21/08; H; H03; H03K; H03K17/00; H03K17/94; H03K17/96; H03K17/962
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
An electronic timepiece having a crystal with an inner face adjacent an electro-optic passive display cell and having several functions, comprising: oscillator means producing a timebase signal; electronic circuit means for controlling the several functions of the timepiece operable by means of at least one stationary key, the stationary key having a capacitive action and being carried on the inner face of the crystal, the stationary key being coupled to the timebase signal by a fixed condenser, and a conductive element interposed between the stationary key and the display cell and constituting one of the two electrodes of the fixed condenser to reduce the influence of a parasitic condenser formed by the plates of the electro-optic passive display cell on the stationary key.
Claim 2
Dependent Claim
123 words
An electronic timepiece having a crystal with an inner face adjacent an electro-optic passive display cell and having several functions, comprising: oscillator means producing a timebase signal; electronic circuit means for controlling the several functions of the timepiece operable by means of at least one stationary key, the stationary key having a capacitive action and being carried on the inner face of the crystal, the stationary key being coupled to the timebase signal by a fixed condenser, and a conductive element interposed between the stationary key and the display cell and constituting one of the two electrodes of the fixed condenser to reduce the influence of a parasitic condenser formed by the plates of the electro-optic passive display cell on the stationary key.
Claim 3
Dependent Claim
30 words
The timepiece as claimed in claim 1 in which the conductive element is coupled to the timebase signal and the stationary key constitutes the oher electrode of the fixed condenser.
Claim 4
Dependent Claim
19 words
The timepiece as claimed in claim 2 in which the conductive element is constituted by a transparent conductive film.
Claim 5
Dependent Claim
31 words
The timepiece as claimed in claim 3 in which the display cell has a front face adjacent the inner face and the transparent conductive film is deposited on the front face.
Claim 6
Dependent Claim
48 words
The timepiece as claimed in claim 3 further including a transparent plate of insulating material having two opposed faces, the plate being interposed between the crystal and the display cell and in which the transparent conductive film is deposited on one of the faces of the transparent plate.
Claim 7
Dependent Claim
40 words
The timepiece as claimed in claim 5 in which one of the faces of the transparent plate is applied to the inner face of the crystal and the transparent conductive film is deposited on the other face of the plate.
Claim 8
Dependent Claim
28 words
The timepiece as claimed in claim 2 further including a securing frame of the display cell and in which the conductive element is constituted by the securing frame.
Claim 9
Dependent Claim
24 words
The timepiece as claimed in claim 2 further including a false dial and in which the conductive element is constituted by the false dial.
References Cited (Backward Citations)
US4090353A
Cited
US3983690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |