US2921945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Yellow diphenylamine dyes
Assignee: Celanese Corp
•
Filing: 1954-05-17
•
Granted: 1960-01-19
•
Expires: 1974-05-17
Abstract
No abstract record available.
Inventors
- 👤 Jr John R Adams
- 👤 Victor S Salvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:03
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/52; D06P1/56; C; C09; C09B; C09B51/00; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/921
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
6 words
A YELLOW DYESTUFF HAVING THE FORMULA
References Cited (Backward Citations)
GB275752A
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US1709292A
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FR748439A
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US2080704A
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US2150692A
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US2364726A
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US2506224A
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US2416884A
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US2480775A
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US2595359A
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US2725390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |