US3588640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High capacitance variable capacitor
Assignee: Sprague Electric Co
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Filing: 1969-11-28
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Granted: 1971-06-28
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Expires: 1989-11-28
Abstract
Abstract IN A LAMINATED STRUCTURE, ONE ELECTRODE IS DISPOSED ON A THIN CERAMIC DIELECTRIC MEMBER IN OVERLYING RELATION TO A LOWER ELECTRODE, AND INCLUDES A PLURALITY OF SPACED CONDUCTIVE ISLAND AREAS WHICH ARE CAPABLE OF BEING INTERCONNECTED IN PARALLEL BY A MOVABLE FLEXIBLE WIPER THAT PROVIDES ELECTRICAL CONNECTION BETWEEN THE ISLANDS AND AN ADJACENT TERMINAL OF THE CAPACITOR.
Inventors
- 👤 John H Fabricius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:57
CPC Classifications
H; H01; H01G; H01G5/00; H01G5/01; H01G5/011; H01G5/04; H01G5/06; H01G5/08; H01G5/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |