Patent US2540137A successfully refreshed from Google Patents.
US2540137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide range tuning circuit
Assignee: Individual
•
Filing: 1943-12-14
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Granted: 1951-02-06
•
Expires: 1963-12-14
Abstract
No abstract record available.
Inventors
- 👤 Irving H Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:14
CPC Classifications
H; H03; H03H; H03H5/00; H03H5/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1660108A
Cited
DE555777C
Cited
US1949842A
Cited
GB388755A
Cited
US1986081A
Cited
US2011299A
Cited
US2081711A
Cited
US2106120A
Cited
US2272851A
Cited
US2194696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |