US2597506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra-short wave electron tube
Assignee: Patelhold Patenverwertungs and Elektro-Holding AG
•
Filing: 1945-11-14
•
Granted: 1952-05-20
•
Expires: 1965-11-14
Abstract
No abstract record available.
Inventors
- 👤 Ludi Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:17
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/50; H01J25/52; H01J25/54; H01J25/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB582489A
Cited
US2409038A
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US2446826A
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US2437280A
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US2473567A
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US2428888A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |