US2713060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyestuff treatment
Assignee: Celanese Corp
•
Filing: 1951-07-24
•
Granted: 1955-07-12
•
Expires: 1971-07-24
Abstract
No abstract record available.
Inventors
- 👤 Victor S Salvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:21
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/51; C09B1/514
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
IN A PROCESS FOR THE PRODUCTION OF IMPROVED ANTHRAQUINONE DYESTUFFS WHEREIN A HYDROXY-SUBSTITUTED NITROANTHRAQUINONE IS CONDENSED WITH AN ORGANIC PRIMARY AMINE AT A TEMPERATURE OF 100 TO 130* C. IN THE PRESENCE OF WATER, THE STEP WHICH COMPRISES TREATING THE DYESTUFF OBTAINED AS A PRODUCT OF THE CONDENSATION BY SUBJECTING THE SAME TO REFLUXING WHILE IN SOLUTION IN AN ORGANIC SOLVENT CONTAINING AN ALKALINE AGENT.
Claim 2
Dependent Claim
65 words
IN A PROCESS FOR THE PRODUCTION OF IMPROVED ANTHRAQUINONE DYESTUFFS WHEREIN A HYDROXY-SUBSTITUTED NITROANTHRAQUINONE IS CONDENSED WITH AN ORGANIC PRIMARY AMINE AT A TEMPERATURE OF 100 TO 130* C. IN THE PRESENCE OF WATER, THE STEP WHICH COMPRISES TREATING THE DYESTUFF OBTAINED AS A PRODUCT OF THE CONDENSATION BY SUBJECTING THE SAME TO REFLUXING WHILE IN SOLUTION IN AN ORGANIC SOLVENT CONTAINING AN ALKALINE AGENT.
References Cited (Backward Citations)
US2480269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-11 | 1959-01-10 | 1959-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-11 | 1963-01-10 | 1963-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-11 | 1967-01-10 | 1967-07-12 | $7700.00 | Window Closed / Lapsed |