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US2955228A
Expired / Lapsed
US
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Electron discharge device
Assignee: Varian Medical Systems Inc
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Filing: 1958-05-26
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Granted: 1960-10-04
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Expires: 1978-05-26
Abstract
No abstract record available.
Inventors
- 👤 Curtis E Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:43
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/22; H01J25/24; H01J23/00; H01J23/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2591696A
Cited
US2678404A
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US2644889A
Cited
FR1108985A
Cited
US2815467A
Cited
US2824258A
Cited
US2806977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-04 | 1964-04-04 | 1964-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-04 | 1968-04-04 | 1968-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-04 | 1972-04-04 | 1972-10-04 | $7700.00 | Window Closed / Lapsed |