Patent US2475050A successfully refreshed from Google Patents.
US2475050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant current circuit
Assignee: RCA Corp
•
Filing: 1945-06-20
•
Granted: 1949-07-05
•
Expires: 1965-06-20
Abstract
No abstract record available.
Inventors
- 👤 Ellison S Purington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:26
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/16; H; H03; H03K; H03K19/00; H03K19/02; H03K19/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2156534A
Cited
US2210394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-04 | 1953-01-03 | 1953-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-04 | 1957-01-03 | 1957-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-04 | 1961-01-03 | 1961-07-05 | $7700.00 | Window Closed / Lapsed |