Patent US2180413A successfully refreshed from Google Patents.
US2180413A
Expired / Lapsed
US
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Magnetically tuned high frequency circuits
Assignee: RCA Corp
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Filing: 1936-11-30
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Granted: 1939-11-21
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Expires: 1956-11-30
Abstract
No abstract record available.
Inventors
- 👤 Robert L Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:49
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0153; H03H7/0161; H03H7/0169; H03H7/0184; H03J; H03J3/00; H03J3/20; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/929
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) | 1942-11-20 | 1943-05-22 | 1943-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-11-20 | 1947-05-22 | 1947-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-11-20 | 1951-05-22 | 1951-11-21 | $7700.00 | Window Closed / Lapsed |