Patent DE857984C successfully refreshed from Google Patents.
US2521426A
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US
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High-voltage evacuated acceleration tube for increasing the total voltage and voltage gradient thereof
Assignee: Research Corp
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Filing: 1949-03-16
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Granted: 1950-09-05
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Expires: 1969-03-16
Abstract
No abstract record available.
Inventors
- 👤 John G Trump
- 👤 Robert W Cloud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:43
CPC Classifications
B; B65; B65B; B65B57/00; B65B57/10; B65B57/14; G; G04; G04F; G04F3/00; G04F3/02; G04F3/022; H; H01; H01J; H01J5/00; H01J5/02; H01J5/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1981537A
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US2227051A
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US2156813A
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US2145727A
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US2182185A
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US2336774A
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US2420560A
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US2376439A
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US2460201A
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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) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |