Patent US5713363A successfully refreshed from Google Patents.
US4055755A
Expired / Lapsed
US
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Switching assembly in combination wristwatch and calculator
Assignee: Sharp Corp
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Filing: 1976-04-15
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Granted: 1977-10-25
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Expires: 1996-04-15
Abstract
Abstract In a combination wristwatch and calculator, a key input means for information entry employs a touch sensitive electronic switching circuitry comprising a C-MOS inverter. One electrode for the touch sensitive electronic switching circuitry is provided on the front panel of the combination wristwatch and calculator, whereas another electrode for the touch sensitive electronic switching circuitry is positioned on the rear surface of the combination wristwatch and calculator. The present key input means is equally applicable to a miniature electronic calculator.
Inventors
- 👤 Tutomu Nakamura
- 👤 Takehiko Sasaki
- 👤 Masaji Yonekawa
- 👤 Hidetoshi Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:07
CPC Classifications
G; G04; G04G; G04G21/00; G04G21/08; G04G9/00; G04G9/0064; G04G9/007; G06; G06F; G06F15/00; G06F15/02; G06F15/0208; H; H01; H01H; H01H13/00; H01H13/70; H01H13/84; H03; H03K; H03K17/00; H03K17/94; H03K17/965; H03K17/967
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
151 words
A combination wristwatch and calculator including a conductive casing, a front insulating panel, a time keeping circuit, an arithmetic calculation circuit, a key input means for introducing desired information into the arithmetic calculation circuit, and an information display for displaying information stored in the time keeping circuit and the arithmetic calculation circuit, said key input means comprising: a plurality of touch electrodes formed on the front insulating panel; and a plurality of touch sensitive electronic switching circuits, each of the touch sensitive electronic switching circuits including; a C-MOS inverter circuit having a gate terminal and two power supply terminals, a power source connected across said power supply terminals, two input terminals connected to one of said touch electrodes and to said conductive casing, respectively, and circuit means for inverting the condition of said C-MOS inverter circuit when said two input terminal are connected to each other through a human body resistor.
Claim 2
Dependent Claim
151 words
A combination wristwatch and calculator including a conductive casing, a front insulating panel, a time keeping circuit, an arithmetic calculation circuit, a key input means for introducing desired information into the arithmetic calculation circuit, and an information display for displaying information stored in the time keeping circuit and the arithmetic calculation circuit, said key input means comprising: a plurality of touch electrodes formed on the front insulating panel; and a plurality of touch sensitive electronic switching circuits, each of the touch sensitive electronic switching circuits including; a C-MOS inverter circuit having a gate terminal and two power supply terminals, a power source connected across said power supply terminals, two input terminals connected to one of said touch electrodes and to said conductive casing, respectively, and circuit means for inverting the condition of said C-MOS inverter circuit when said two input terminal are connected to each other through a human body resistor.
Claim 3
Dependent Claim
35 words
The combination wristwatch and calculator of claim 1, which further comprises a metal belt attached to the combination wristwatch and calculator, wherein the touch sensitive electronic switching circuitries are commonly connected to the metal belt.
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) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |