US2913301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azoic dyeing of leather
Assignee: GAF Chemicals Corp
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Filing: 1955-10-31
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Granted: 1959-11-17
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Expires: 1975-10-31
Abstract
No abstract record available.
Inventors
- 👤 Streck Clemens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:05
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/32; D06P3/3273
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A PROCESS FOR THE AZOIC DYEING OF LEATHER COMPRISING TREATING LEATHER WITH AN ZOIC COUPLING COMPONENT DEVOID OF SULFONIC AND CARBOXYLIC ACID SOLUBILIZING GROUPS TROM AN AQUEOUS SOLUTION HAVING AN INITIAL PH OF MORE THAN 7 AND LESS THAN 11, WHILE LOWERING THE PH OF SAID AQUEOUS SOLUTION TO A FINAL PH OF NO MORE THAN 7 WHILE CONTROLLING THE RATE AT WHICH SUCH PH IS SO LOWERED SO THAT A PH OF MORE THAN 7 IS MAINTAINED FOR FROM ABOUT 15 MINUTES TO TWO HOURS, AND THEN TREATING THE LEATHER WITH A DIAZOTIZED AROMATIC PRIM,ARY AMNE COMPOUND DEVOID OF SULFONIC AND CARBOXYLIC ACID SOLUBILIZING GROUPS TO PRODUCE ITS REACTION PRODUCT WITH SAID COUPLING COMPONENT IN SITU.
Claim 2
Dependent Claim
117 words
A PROCESS FOR THE AZOIC DYEING OF LEATHER COMPRISING TREATING LEATHER WITH AN ZOIC COUPLING COMPONENT DEVOID OF SULFONIC AND CARBOXYLIC ACID SOLUBILIZING GROUPS TROM AN AQUEOUS SOLUTION HAVING AN INITIAL PH OF MORE THAN 7 AND LESS THAN 11, WHILE LOWERING THE PH OF SAID AQUEOUS SOLUTION TO A FINAL PH OF NO MORE THAN 7 WHILE CONTROLLING THE RATE AT WHICH SUCH PH IS SO LOWERED SO THAT A PH OF MORE THAN 7 IS MAINTAINED FOR FROM ABOUT 15 MINUTES TO TWO HOURS, AND THEN TREATING THE LEATHER WITH A DIAZOTIZED AROMATIC PRIM,ARY AMNE COMPOUND DEVOID OF SULFONIC AND CARBOXYLIC ACID SOLUBILIZING GROUPS TO PRODUCE ITS REACTION PRODUCT WITH SAID COUPLING COMPONENT IN SITU.
References Cited (Backward Citations)
US2150389A
Cited
GB707884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |