Patent US2499800A successfully refreshed from Google Patents.
US2499800A
Expired / Lapsed
US
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Azo dyes formed from p-nitroanilines and 2-hydroxy-7-benzo-(c) carbazoles and their formation on the fiber
Assignee: EIDP Inc
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Filing: 1947-06-27
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Granted: 1950-03-07
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Expires: 1967-06-27
Abstract
No abstract record available.
Inventors
- 👤 Joseph H Trepagnier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:04
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/02; D06P1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A WATER-INSOLUBLE AZO COMPOUND IN WHICH THE DIAZO OF ONE OF THE GROUP CONSISTING OF 4NITROANILINE AND THE DERIVATIVES THEREOF IN WHICH THE 2-POSITION OF THE BENZENE RING IS OCCUPIED BY ONE OF THE GROUP CONSISTING OF ALKYL HAVING 1 TO 5 CARBONS, THE CORRESPONDING ALKOXY GROUPS, CHLORO AND FLUORO, IS COUPLED WITH A COUPLING COMPONENT REPRESENTED BY THE FORMULA
Claim 2
Dependent Claim
60 words
A WATER-INSOLUBLE AZO COMPOUND IN WHICH THE DIAZO OF ONE OF THE GROUP CONSISTING OF 4NITROANILINE AND THE DERIVATIVES THEREOF IN WHICH THE 2-POSITION OF THE BENZENE RING IS OCCUPIED BY ONE OF THE GROUP CONSISTING OF ALKYL HAVING 1 TO 5 CARBONS, THE CORRESPONDING ALKOXY GROUPS, CHLORO AND FLUORO, IS COUPLED WITH A COUPLING COMPONENT REPRESENTED BY THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |