US2620445A
Expired / Lapsed
US
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Apparatus for determining daylight fluorescence
Assignee: Interchemical Corp
•
Filing: 1951-04-03
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Granted: 1952-12-02
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Expires: 1971-04-03
Abstract
No abstract record available.
Inventors
- 👤 John E Tyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:42
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N2201/00; G01N2201/06; G01N2201/061; G01N2201/0616
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1195912A
Cited
US1727173A
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US1960097A
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US2234278A
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US2417383A
Cited
US2478745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |