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Patent US2935783A successfully refreshed from Google Patents.
US2935783A
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Method of making electron tubes
Assignee: Varian Medical Systems Inc
•
Filing: 1957-09-19
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Granted: 1960-05-10
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Expires: 1977-09-19
Abstract
No abstract record available.
Inventors
- 👤 Jack A Mccullough
- 👤 George F Wunderlich
- 👤 Paul D Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:29
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/32; H01J19/34; H01J2893/00; H01J2893/0001; H01J2893/0002; H01J2893/0003; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49764; Y10T29/49778
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2699516A
Cited
US2601025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-10 | 1963-11-09 | 1964-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-10 | 1967-11-09 | 1968-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-10 | 1971-11-09 | 1972-05-10 | $7700.00 | Window Closed / Lapsed |