Patent US805791A successfully refreshed from Google Patents.
US2582684A
Expired / Lapsed
US
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Electron tube structure
Assignee: Varian Medical Systems Inc
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Filing: 1949-07-12
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Granted: 1952-01-15
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Expires: 1969-07-12
Abstract
No abstract record available.
Inventors
- 👤 Donald F Drieschman
- 👤 Hubert H Eaves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:02
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/42; H01J2893/00; H01J2893/0001; H01J2893/0002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2269840A
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US2478573A
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US2282392A
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US2278628A
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US2367332A
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US2424990A
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US2385974A
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US2444281A
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US2455846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-14 | 1955-07-16 | 1956-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-14 | 1959-07-16 | 1960-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-14 | 1963-07-16 | 1964-01-15 | $7700.00 | Window Closed / Lapsed |