US2740067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic vacuum tube
Assignee: Varian Medical Systems Inc
•
Filing: 1952-10-13
•
Granted: 1956-03-27
•
Expires: 1972-10-13
Abstract
No abstract record available.
Inventors
- 👤 Harold E Sorg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:34
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1561249A
Cited
US2099531A
Cited
US2173906A
Cited
US2343849A
Cited
US2335818A
Cited
US2431020A
Cited
US2647218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |