Patent US2903638A successfully refreshed from Google Patents.
US2903638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply
Assignee: RCA Corp
•
Filing: 1955-10-31
•
Granted: 1959-09-08
•
Expires: 1975-10-31
Abstract
No abstract record available.
Inventors
- 👤 Louis L Evans
- 👤 Donald F Sprengeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:10
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/33
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2215175A
Cited
US2386548A
Cited
US2697798A
Cited
US2565621A
Cited
US2683852A
Cited
US2739191A
Cited
US2753509A
Cited
US2720622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |