US2442776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio-frequency choke coil
Assignee: Individual
•
Filing: 1944-11-08
•
Granted: 1948-06-08
•
Expires: 1964-11-08
Abstract
No abstract record available.
Inventors
- 👤 Thomas A Newkirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:02
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/02; H01F5/00; H01F2005/006; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1132281A
Cited
US1372850A
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US1133441A
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AT95626B
Cited
US1816448A
Cited
US1839802A
Cited
US2163644A
Cited
US2249909A
Cited
US2351604A
Cited
US2378890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-08 | 1951-12-08 | 1952-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-08 | 1955-12-08 | 1956-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-08 | 1959-12-08 | 1960-06-08 | $7700.00 | Window Closed / Lapsed |