US2722626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic cathode
Assignee: US Philips Corp
•
Filing: 1953-02-16
•
Granted: 1955-11-01
•
Expires: 1973-02-16
Abstract
No abstract record available.
Inventors
- 👤 Patrick P Coppola
- 👤 Ray C Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:00
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1716545A
Cited
US1846242A
Cited
US1922244A
Cited
US2121589A
Cited
US2175345A
Cited
US2543728A
Cited
US2624024A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-31 | 1959-05-02 | 1959-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-31 | 1963-05-02 | 1963-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-31 | 1967-05-02 | 1967-11-01 | $7700.00 | Window Closed / Lapsed |