Patent US2774423A successfully refreshed from Google Patents.
Patent US1989205A successfully refreshed from Google Patents.
US1989205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple coil assembly
Assignee: RCA Corp
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Filing: 1931-09-16
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Granted: 1935-01-29
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Expires: 1951-09-16
Abstract
No abstract record available.
Inventors
- 👤 William D Loughlin
- 👤 Paul O Farnham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:35
CPC Classifications
H; H01; H01F; H01F21/00; H01F21/12
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) | 1938-01-28 | 1938-07-30 | 1939-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-01-28 | 1942-07-30 | 1943-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-01-28 | 1946-07-30 | 1947-01-29 | $7700.00 | Window Closed / Lapsed |