US1784150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier of electrical currents
Assignee: RCA Corp
•
Filing: 1923-06-22
•
Granted: 1930-12-09
•
Expires: 1943-06-22
Abstract
No abstract record available.
Inventors
- 👤 Edward H Loftin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:14
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/46; H03F3/48
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) | 1933-12-08 | 1934-06-09 | 1934-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-12-08 | 1938-06-09 | 1938-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-12-08 | 1942-06-09 | 1942-12-09 | $7700.00 | Window Closed / Lapsed |