US2900554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sleeve for indirectly heated cathode
Assignee: RCA Corp
•
Filing: 1951-06-01
•
Granted: 1959-08-18
•
Expires: 1971-06-01
Abstract
No abstract record available.
Inventors
- 👤 Wochling John George
- 👤 Jr Robert Friedli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:45
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/26
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE75038C
Cited
US440512A
Cited
US694994A
Cited
US1190351A
Cited
US2075910A
Cited
US1895133A
Cited
US2096044A
Cited
US2116971A
Cited
US2118765A
Cited
US2220909A
Cited
US2612619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |