Patent US2994009A successfully refreshed from Google Patents.
US2994009A
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US
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High frequency tube apparatus
Assignee: Varian Medical Systems Inc
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Filing: 1958-07-17
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Granted: 1961-07-25
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Expires: 1978-07-17
Abstract
No abstract record available.
Inventors
- 👤 Robert C Schmidt
- 👤 Robert S Symons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:20
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/005; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J23/16; H01J23/18; H01J23/20; H01J23/207; H01J23/36; H01J23/40; H01J23/46; H01J25/00; H01J25/02; H01J25/10; H01J25/12; H03; H03H; H03H5/00; H03H5/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2496887A
Cited
US2481171A
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US2512901A
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US2606302A
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US2876383A
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US2757314A
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US2846614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |