US5483503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split chip inverter for EL lamp
Assignee: World Properties Inc
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Filing: 1995-06-30
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Granted: 1996-01-09
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Expires: 2015-06-30
Abstract
Abstract An electronic watch, either digital or analog, includes an EL lamp powered by a split chip inverter having a low voltage portion incorporated into a first semiconductor chip and a high voltage portion incorporated in a second semiconductor chip. The first semiconductor chip preferably includes all the other low voltage circuitry of the watch, e.g. timer/divider circuitry and logic for driving a display.
Inventors
- 👤 Robert A. Kimball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:46
CPC Classifications
G; G04; G04G; G04G99/00; G04B; G04B19/00; G04B19/30; G04G19/00; H; H05; H05B; H05B44/00; Y; Y02; Y02B; Y02B20/00; Y02B20/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
In an electronic watch including a battery, a timer, a display, an electroluminescent lamp for backlighting the display, and an inverter for supplying power to the electroluminescent lamp, the improvement comprising: said inverter having a high voltage portion and a low voltage portion; wherein said low voltage portion and said timer are implemented in a first semiconductor chip and only said high voltage portion is implemented in a second semiconductor chip.
Claim 2
Dependent Claim
71 words
In an electronic watch including a battery, a timer, a display, an electroluminescent lamp for backlighting the display, and an inverter for supplying power to the electroluminescent lamp, the improvement comprising: said inverter having a high voltage portion and a low voltage portion; wherein said low voltage portion and said timer are implemented in a first semiconductor chip and only said high voltage portion is implemented in a second semiconductor chip.
Claim 3
Dependent Claim
16 words
The electronic watch as set forth in claim 1 wherein said electronic watch includes a microprocessor.
Claim 4
Dependent Claim
19 words
The electronic watch as set forth in claim 3 wherein said microprocessor is implemented on said first semiconductor chip.
Claim 5
Dependent Claim
21 words
The electronic watch as set forth in claim 2 wherein said display is a liquid crystal display coupled to said microprocessor.
Claim 6
Dependent Claim
16 words
The electronic watch as set forth in claim 1 wherein said display is an analog dial.
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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) | 1999-01-08 | 1999-07-10 | 2000-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-08 | 2003-07-10 | 2004-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-08 | 2007-07-10 | 2008-01-09 | $7700.00 | Window Closed / Lapsed |