Patent US2039657A successfully refreshed from Google Patents.
US2039657A
Expired / Lapsed
US
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Supersonic heterodyne receiver
Assignee: EMI Ltd
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Filing: 1934-02-12
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Granted: 1936-05-05
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Expires: 1954-02-12
Abstract
No abstract record available.
Inventors
- 👤 Osborne Charles Percy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/08; H03B5/10; H03J; H03J7/00; H03J7/02; H03J7/04; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/26
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) | 1939-05-05 | 1939-11-04 | 1940-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-05-05 | 1943-11-04 | 1944-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-05-05 | 1947-11-04 | 1948-05-05 | $7700.00 | Window Closed / Lapsed |