Patent US2543797A successfully refreshed from Google Patents.
US2543797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio amplifier circuits
Assignee: Individual
•
Filing: 1942-05-23
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Granted: 1951-03-06
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Expires: 1962-05-23
Abstract
No abstract record available.
Inventors
- 👤 Irving H Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:14
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0138; H03H7/0146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1466841A
Cited
US2181309A
Cited
US2173497A
Cited
US2258762A
Cited
US2259538A
Cited
US2248267A
Cited
US2259532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |