Patent US2439809A successfully refreshed from Google Patents.
US2439809A
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Temperature compensation means for fixed reactances in tunable circuits
Assignee: Collins Radio Co
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Filing: 1943-02-01
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Granted: 1948-04-20
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Expires: 1963-02-01
Abstract
No abstract record available.
Inventors
- 👤 Theodore A Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:37
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US995854A
Cited
US1078200A
Cited
US1845998A
Cited
US1589308A
Cited
US1884591A
Cited
US2028596A
Cited
GB335164A
Cited
US1836808A
Cited
US2113603A
Cited
GB400025A
Cited
US1970969A
Cited
US2134794A
Cited
US2100412A
Cited
US2114846A
Cited
US2180413A
Cited
US2174346A
Cited
US2151752A
Cited
US2144029A
Cited
US2265390A
Cited
US2332518A
Cited
US2281461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |