US2929133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispenser cathode
Assignee: US Philips Corp
•
Filing: 1956-09-05
•
Granted: 1960-03-22
•
Expires: 1976-09-05
Abstract
No abstract record available.
Inventors
- 👤 Ray C Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:28
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28; H01J9/00; H01J9/02; H01J9/04; H01J9/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1552310A
Cited
US1720000A
Cited
US1883898A
Cited
US1895354A
Cited
US2179960A
Cited
US2246166A
Cited
US2700118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-22 | 1963-09-21 | 1964-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-22 | 1967-09-21 | 1968-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-22 | 1971-09-21 | 1972-03-22 | $7700.00 | Window Closed / Lapsed |