US2963616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic tube apparatus
Assignee: Varian Medical Systems Inc
•
Filing: 1955-07-08
•
Granted: 1960-12-06
•
Expires: 1975-07-08
Abstract
No abstract record available.
Inventors
- 👤 Richard B Nelson
- 👤 Robert S Symons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:35
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/005; H01J23/16; H01J23/18; H01J23/20; H01J23/207
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) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |