US2593406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyestuffs and method of making same
Assignee: Diamond Shamrock Corp
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Filing: 1947-12-26
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Granted: 1952-04-22
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Expires: 1967-12-26
Abstract
No abstract record available.
Inventors
- 👤 David A Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:06
CPC Classifications
C; C09; C09B; C09B39/00; Y; Y10; Y10S; Y10S534/00; Y10S534/01
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
122 words
THE PROCESS FOR PREPARING AN AZO DYESTUFF COMPOSITION WHICH INCLUDES THE STEPS OF CONDENSING CHLORINATED PARAFFIN WAX HAVING FROM 18-36 CARBON ATOMS IN THE MOLECULES THEREOF AND CONTAINING ABOUT 60% OF CHEMICALLY COMBINED CHLORINE, WITH ABOUT TWICE ITS WEIGHT OF ACETANILIDE, TO SUBSTITUTE SAID ANILIDE THROUGH A CARBON ATOM OF THE AROMATIC NUCLEUS THEREOF FOR AT LEAST ONE AND LESS THAN ALL OF THE EQUIVALENTS OF THE CHEMICALLY COMBINED CHLORINE OF SAID CHLORINATED WAX, HYDROLYZING THE ANILINE OF THE REACTION PRODUCT THUS OBTAINED TO A PRIMARY AMINE, DIAZOTIZED THE AMINE THUS FORMED, COUPLING DIAZOTIZED PRODUCT WITH 1-NAPHTHYLAMINE-2SULFONIC ACID, SUBJECTING THE PRODUCT THUS FORMED TO DISAZOTIZATION, COUPLING SAID PRODUCT OF THE SECOND DIAZOTIZATION WITH SULFANILIC ACID, AND RECOVERING THE AZO DYESTUFF THUS FORMED.
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) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |