US3372297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency electron discharge devices and thermionic cathodes having improved (cvd) refractory insulation coated heater wires
Assignee: Varian Medical Systems Inc
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Filing: 1964-09-28
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Granted: 1968-03-05
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Expires: 1984-09-28
Abstract
No abstract record available.
Inventors
- 👤 Cortland S Pearsall
- 👤 Ray T Wimber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:07
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/22; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2700626A
Cited
US2665998A
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US2817784A
Cited
US2714563A
Cited
US2991391A
Cited
US3029360A
Cited
US3178308A
Cited
US3251337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |