Patent US1563440A successfully refreshed from Google Patents.
US1563440A
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US
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Variable condenser
Assignee: RUSSELL RADIO Corp
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Filing: 1925-02-03
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Granted: 1925-12-01
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Expires: 1945-02-03
Abstract
No abstract record available.
Inventors
- 👤 Russell Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:03
CPC Classifications
H; H01; H01G; H01G5/00; H01G5/04; H01G5/12
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) | 1928-11-30 | 1929-06-01 | 1929-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-11-30 | 1933-06-01 | 1933-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-11-30 | 1937-06-01 | 1937-12-01 | $7700.00 | Window Closed / Lapsed |