Patent US1996830A successfully refreshed from Google Patents.
US1996830A
Expired / Lapsed
US
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Amplifier
Assignee: RCA Corp
•
Filing: 1929-08-23
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Granted: 1935-04-09
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Expires: 1949-08-23
Abstract
No abstract record available.
Inventors
- 👤 Posthumus Klaas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:13
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/36; H03F3/00; H03F3/38; H03F3/40; H03G; H03G7/00; H03G7/02; H03G7/04
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) | 1938-04-08 | 1938-10-08 | 1939-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-04-08 | 1942-10-08 | 1943-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-04-08 | 1946-10-08 | 1947-04-09 | $7700.00 | Window Closed / Lapsed |