US2591345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current amplifier with synchronized chopper and rectifier with phase sense
Assignee: Individual
•
Filing: 1950-06-01
•
Granted: 1952-04-01
•
Expires: 1970-06-01
Abstract
No abstract record available.
Inventors
- 👤 Ellis Greer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:59
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; H03F3/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1668748A
Cited
US2122499A
Cited
US2293135A
Cited
US2364190A
Cited
US2450018A
Cited
US2439050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |