US2949557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Equipotential cathode for electric discharge tubes
Assignee: US Philips Corp
•
Filing: 1958-10-03
•
Granted: 1960-08-16
•
Expires: 1978-10-03
Abstract
No abstract record available.
Inventors
- 👤 Gerlach Hans Georg
- 👤 Dorgelo Eduard Gerhardus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:43
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28; H01J1/15; H01J1/16; H01J9/00; H01J9/02; H01J9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2526054A
Cited
US2723363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |