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Patent US2607782A successfully refreshed from Google Patents.
US2607782A
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Process for the production of 1:4:5:8 tetraamino-anthraquinone
Assignee: Celanese Corp
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Filing: 1947-09-30
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Granted: 1952-08-19
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Expires: 1967-09-30
Abstract
No abstract record available.
Inventors
- 👤 George W Seymour
- 👤 Victo S Salvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:17
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
IN A PROCESS FOR THE PRODUCTION OF 1:4:5:8TETRAAMINO - ANTHRAQUINONE SUBSTANTIALLY FREE FROM TRIAMINO-ANTHRAQUINONE, WHICH INCLUDES NUTRATING A MIXTURE OF ACETYLATED 1:5- AND 1:8DIAMINO-ANTHRAQUINONE, REDUCING THE ADDED NITRO GROUPS, AND THEN HYDROLYZING THE ACETYLAMINO GROUPS TO FORM FREE AMINO GROUPS, THE STEP WHICH COMPRISES EFFECTING THE NITRATION OF THE MIXED ACETYLATED 1:5- AND 1:8-DIAMINO-ANTHRAQUINONE AT A TEMPERATURE OF FROM 10 TO 20* C. IN A SOLUTION CONTAINING A TOTAL OF 6.0 TO 9.6 PARTS BY WEIGHT OF 100% SULFURIC ACID AND ABOUT 0.6 PART BY WEIGHT OF NITRIC ACID ON THE WEIGHT OF THE ANTHRAQUINONE COMPOUND.
Claim 2
Dependent Claim
96 words
IN A PROCESS FOR THE PRODUCTION OF 1:4:5:8TETRAAMINO - ANTHRAQUINONE SUBSTANTIALLY FREE FROM TRIAMINO-ANTHRAQUINONE, WHICH INCLUDES NUTRATING A MIXTURE OF ACETYLATED 1:5- AND 1:8DIAMINO-ANTHRAQUINONE, REDUCING THE ADDED NITRO GROUPS, AND THEN HYDROLYZING THE ACETYLAMINO GROUPS TO FORM FREE AMINO GROUPS, THE STEP WHICH COMPRISES EFFECTING THE NITRATION OF THE MIXED ACETYLATED 1:5- AND 1:8-DIAMINO-ANTHRAQUINONE AT A TEMPERATURE OF FROM 10 TO 20* C. IN A SOLUTION CONTAINING A TOTAL OF 6.0 TO 9.6 PARTS BY WEIGHT OF 100% SULFURIC ACID AND ABOUT 0.6 PART BY WEIGHT OF NITRIC ACID ON THE WEIGHT OF THE ANTHRAQUINONE COMPOUND.
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) | 1955-08-19 | 1956-02-18 | 1956-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-19 | 1960-02-18 | 1960-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-19 | 1964-02-18 | 1964-08-19 | $7700.00 | Window Closed / Lapsed |