US2991391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron beam discharge apparatus
Assignee: Varian Medical Systems Inc
•
Filing: 1957-07-24
•
Granted: 1961-07-04
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Expires: 1977-07-24
Abstract
No abstract record available.
Inventors
- 👤 William L Beaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:28
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/08; H01J23/087; H01J23/36; H01J23/40; H01J23/42; H01J25/00; H01J25/34; H01J25/36; H01J25/38; H01J25/40
Claims Analysis
Total Claims: 0
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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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |