Patent FR2474304A1 successfully refreshed from Google Patents.
US2721970A
Expired / Lapsed
US
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Method and means for identifying substances
Assignee: Varian Medical Systems Inc
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Filing: 1952-01-30
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Granted: 1955-10-25
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Expires: 1972-01-30
Abstract
No abstract record available.
Inventors
- 👤 Elliott C Levinthal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:56
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2124577A
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US2218784A
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US2149847A
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US2555308A
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US2561489A
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US2561490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |