US2586895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency converter for radio receiving systems
Assignee: International Standard Electric Corp
•
Filing: 1947-08-19
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Granted: 1952-02-26
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Expires: 1967-08-19
Abstract
No abstract record available.
Inventors
- 👤 Willoughby Eric Osborne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:23
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/14; H03D7/1408; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/247; H01Q13/00; H01Q13/10; H01Q13/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2402622A
Cited
US2423088A
Cited
US2412003A
Cited
US2414266A
Cited
US2433804A
Cited
US2424796A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |