US2497111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron tube having carburized thoriated cathode
Assignee: Varian Medical Systems Inc
•
Filing: 1947-07-25
•
Granted: 1950-02-14
•
Expires: 1967-07-25
Abstract
No abstract record available.
Inventors
- 👤 Paul D Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:15
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/30; H01J1/00; H01J1/02; H01J1/13; H01J1/14; H01J1/146; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/002; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/292
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1852865A
Cited
US2144249A
Cited
US2232083A
Cited
US2282097A
Cited
US2400893A
Cited
US2459792A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |