US2553375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of dyeing fur skins with insoluble azo dyestuffs
Assignee: NAPHTOL CHEMIE OFFENBACH
•
Filing: 1950-10-09
•
Granted: 1951-05-15
•
Expires: 1970-10-09
Abstract
No abstract record available.
Inventors
- 👤 Kirst Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:29
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/30; D06P3/3075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS OF DYEING FURSKINS WITH INSOLUBLE AZO DYESTUFFS, WHICH COMPRISES TREATING THE FURSKINS WITH AN ALKALINE SOLUTION OF A COUPLING COMPONENT HAVING AT LEAST ONE HYDROXY GROUP AND BEING CAPABLE OF COUPLING IN ORTHO-POSITION TO THE HYDROXY GROUP, SAID SOLUTION CONTAINING AT LEAST 2 MOLS OF FORMALDEHYDE FOR EACH MOL OF THE COUPLING COMPONENT AND HAVING A PH VALUE IN EXCESS OF 11, AND THEREAFTER DEVELOPING THE DYESTUFF ON THE FURSKINS BY TREATMENT WITH A SOLUTION OF A DIAZONIUM COMPOUND.
Claim 2
Dependent Claim
81 words
A PROCESS OF DYEING FURSKINS WITH INSOLUBLE AZO DYESTUFFS, WHICH COMPRISES TREATING THE FURSKINS WITH AN ALKALINE SOLUTION OF A COUPLING COMPONENT HAVING AT LEAST ONE HYDROXY GROUP AND BEING CAPABLE OF COUPLING IN ORTHO-POSITION TO THE HYDROXY GROUP, SAID SOLUTION CONTAINING AT LEAST 2 MOLS OF FORMALDEHYDE FOR EACH MOL OF THE COUPLING COMPONENT AND HAVING A PH VALUE IN EXCESS OF 11, AND THEREAFTER DEVELOPING THE DYESTUFF ON THE FURSKINS BY TREATMENT WITH A SOLUTION OF A DIAZONIUM COMPOUND.
References Cited (Backward Citations)
US13206A
Cited
US787923A
Cited
US1628484A
Cited
US1718882A
Cited
US1978800A
Cited
GB451264A
Cited
GB457798A
Cited
US2183752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |