US2892121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge device
Assignee: Varian Medical Systems Inc
•
Filing: 1954-03-25
•
Granted: 1959-06-23
•
Expires: 1974-03-25
Abstract
No abstract record available.
Inventors
- 👤 Frederick L Salisbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:08
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)
US2403795A
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US2543082A
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US2421725A
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US2632231A
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US2624859A
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US2644908A
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US2606302A
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US2687490A
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US2709294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-22 | 1962-12-22 | 1963-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-22 | 1966-12-22 | 1967-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-22 | 1970-12-22 | 1971-06-23 | $7700.00 | Window Closed / Lapsed |