US2445811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency tube structure
Assignee: Unisys Corp
•
Filing: 1941-12-22
•
Granted: 1948-07-27
•
Expires: 1961-12-22
Abstract
No abstract record available.
Inventors
- 👤 Russell H Varian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:33
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/10; H01J25/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2280824A
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US2281935A
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US2242249A
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US2245627A
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US2259690A
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US2304186A
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US2316276A
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US2305883A
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US2362209A
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US2263184A
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US2295680A
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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) | 1951-07-27 | 1952-01-26 | 1952-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-27 | 1956-01-26 | 1956-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-27 | 1960-01-26 | 1960-07-27 | $7700.00 | Window Closed / Lapsed |