Patent US2490636A successfully refreshed from Google Patents.
Patent US2878393A successfully refreshed from Google Patents.
US2878393A
Expired / Lapsed
US
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X-ray tube with variable focal spot and control means therefor
Assignee: Picker X Ray Corp
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Filing: 1955-01-12
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Granted: 1959-03-17
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Expires: 1975-01-12
Abstract
No abstract record available.
Inventors
- 👤 Edward B Graves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:34
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/26; H05G1/30; H05G1/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1946288A
Cited
US1946287A
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US2129646A
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US2119679A
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US2286091A
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US2396023A
Cited
US2458891A
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US2476150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |