US2913302A
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 11:54
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/32; D06P3/3273
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A PROCESS FOR THE AZOIC DYEING OF LEATHER COMPRISING TREATING LEATHER WITH AN AZOIC COUPLING COMPONENT DEVOID OF SULFONIC AND CARBOXYLIC ACID SOLUBILIZING GROUPS AND SELECTED FROM THE GROUP CONSISTING OF PYRAZOLONES AND AROMATIC HYDROXY COMPOUNDS CAPABLE OF COUPLING FROM AN AQUEOUS SOLUTION HAVING AN INITIAL PH OF MORE THAN 7 AND LESS THAN 11 AND CONTAINING A FORMALDEHYDE YIELDING SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, PARAFORMALDEHYDE, HEXAMETHYLENETETRAMINE, AND FORMALDEHYDE BISULFITE, AND A WATER-SOLUBLE LOWER NONAROMATIC AMINE OF NO MORE THAN 6 CARBON ATOMS, LOWERING THE PH OF SAID SOLUTION TO A FINAL PH OF NO MORE THAN 7 OVER A PERIOD OF FROM ABOUT 15 MINUTES TO 1.5 HOURS, AND THEN TREATING THE LEATHER WITH A DIAZOTIZED AROMATIC PRIMARY AMINE COMPOUND DEVOID OF SULFONIC AND CARBOXYLIC ACID SOLUBILIZING GROUPS TO PRODUCE ITS REACTION PRODUCT WITH SAID COUPLING COMPONENT IN SITU.
Claim 2
Dependent Claim
143 words
A PROCESS FOR THE AZOIC DYEING OF LEATHER COMPRISING TREATING LEATHER WITH AN AZOIC COUPLING COMPONENT DEVOID OF SULFONIC AND CARBOXYLIC ACID SOLUBILIZING GROUPS AND SELECTED FROM THE GROUP CONSISTING OF PYRAZOLONES AND AROMATIC HYDROXY COMPOUNDS CAPABLE OF COUPLING FROM AN AQUEOUS SOLUTION HAVING AN INITIAL PH OF MORE THAN 7 AND LESS THAN 11 AND CONTAINING A FORMALDEHYDE YIELDING SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, PARAFORMALDEHYDE, HEXAMETHYLENETETRAMINE, AND FORMALDEHYDE BISULFITE, AND A WATER-SOLUBLE LOWER NONAROMATIC AMINE OF NO MORE THAN 6 CARBON ATOMS, LOWERING THE PH OF SAID SOLUTION TO A FINAL PH OF NO MORE THAN 7 OVER A PERIOD OF FROM ABOUT 15 MINUTES TO 1.5 HOURS, AND THEN TREATING THE LEATHER WITH A DIAZOTIZED AROMATIC PRIMARY AMINE COMPOUND DEVOID OF SULFONIC AND CARBOXYLIC ACID SOLUBILIZING GROUPS TO PRODUCE ITS REACTION PRODUCT WITH SAID COUPLING COMPONENT IN SITU.
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) | 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 |