US2996347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making electron tubes
Assignee: Varian Medical Systems Inc
•
Filing: 1957-12-05
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Granted: 1961-08-15
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Expires: 1977-12-05
Abstract
No abstract record available.
Inventors
- 👤 Jack A Mccullough
- 👤 William R Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:25
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/20; H01J5/22; H01J5/28; G; G06; G06F; G06F7/00; G06F7/38; G06F7/383; H01J19/00; H01J19/42; H01J19/46; H01J2893/00; H01J2893/0001; H01J2893/0002; H01J2893/0005; H01J2893/0006; H01J2893/0033; H01J2893/0037; H01J2893/0044
Claims Analysis
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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) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |