US2497543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deflecting and focusing means for x-rays
Assignee: Dow Chemical Co
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Filing: 1946-09-19
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Granted: 1950-02-14
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Expires: 1966-09-19
Abstract
No abstract record available.
Inventors
- 👤 Ludo K Frevel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:39
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/06; G21K2201/00; G21K2201/06; G21K2201/062; G21K2201/064; G21K2201/067
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1208474A
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US1556990A
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US1865441A
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FR601545A
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GB382518A
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US1993058A
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US2265226A
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GB506022A
Cited
US2279762A
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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) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |