US2957100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetron cathode structure
Assignee: US Philips Corp
•
Filing: 1957-08-27
•
Granted: 1960-10-18
•
Expires: 1977-08-27
Abstract
No abstract record available.
Inventors
- 👤 George A Espersen
- 👤 Weis Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:54
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/04; H01J23/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2454031A
Cited
US2463372A
Cited
FR934919A
Cited
US2582185A
Cited
US2698913A
Cited
US2704338A
Cited
GB761684A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |