Patent US2528636A successfully refreshed from Google Patents.
US2528636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio receiver operable for either radio reception or telephone amplification
Assignee: Individual
•
Filing: 1947-04-07
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Granted: 1950-11-07
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Expires: 1967-04-07
Abstract
No abstract record available.
Inventors
- 👤 Harry G Cisin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:00
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/21; H04M1/215
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1484973A
Cited
US1973081A
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US2005973A
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GB461626A
Cited
US2160829A
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US2079089A
Cited
US2214992A
Cited
US2186500A
Cited
US2159632A
Cited
US2268665A
Cited
US2294048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |