Patent US2446271A successfully refreshed from Google Patents.
US2446271A
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US
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Electron tube grid structure
Assignee: Varian Medical Systems Inc
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Filing: 1946-01-23
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Granted: 1948-08-03
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Expires: 1966-01-23
Abstract
No abstract record available.
Inventors
- 👤 William W Eitel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:47
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/38; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0015; H01J2893/0016
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1472505A
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US1892819A
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GB365303A
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US2045526A
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US2047369A
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US2338036A
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US2413689A
Cited
US2415360A
Cited
US2402119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-03 | 1952-02-02 | 1952-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-03 | 1956-02-02 | 1956-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-03 | 1960-02-02 | 1960-08-03 | $7700.00 | Window Closed / Lapsed |