US2508280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron tube
Assignee: Patelhold Patenverwertungs and Elektro-Holding AG
•
Filing: 1945-03-17
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Granted: 1950-05-16
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Expires: 1965-03-17
Abstract
No abstract record available.
Inventors
- 👤 Fritz Ludi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:12
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/14; H01J23/15; H01J25/00; H01J25/50; H01J25/52; H01J25/54; H01J25/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1791973A
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US2096817A
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US2305781A
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GB509102A
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US2250698A
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US2324772A
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US2289220A
Cited
US2348986A
Cited
US2444242A
Cited
US2416298A
Cited
US2409038A
Cited
US2412372A
Cited
US2421636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-15 | 1953-11-14 | 1954-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-15 | 1957-11-14 | 1958-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-15 | 1961-11-14 | 1962-05-16 | $7700.00 | Window Closed / Lapsed |