Process and composition of sulfur dyes
Patent 6287349 Issued on September 11, 2001. Estimated Expiration Date: 
November 22, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 22, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3294475 3415808 Dyeing of cellulose-containing textiles in glycol and glycol ether solvents Dyeing leather with water-insoluble sulphur dyes Patent #: 5240466 InventorsAssigneeApplicationNo. 447126 filed on 11/22/1999US Classes:8/640, With sulfur dye or vat dye8/642, Sulfur dye or vat dye8/650, Sulfur dye or vat dye8/652Sulfur dye (sulfur-organic reaction product dye)ExaminersPrimary: Einsmann, MargaretAttorney, Agent or FirmForeign Patent References
International ClassesD06P 001/22D06P 001/30 C09B 067/22 AbstractA process for dyeing fibrous substrates which comprises the steps of: providing a fibrous substrate; providing at least one sulfur dye; providing at least one reduction stable direct dye; and applying said reduction stable direct dye and sulfur dye to said fibrous substrate in the presence of a suitable reducing agent. Further, it has been surprising to find that these reduction stable direct dyes can be processed without a sulfur dye present. This results in a process for dyeing fibrous substrates which comprises the steps of: providing a fibrous substrate; providing a reduction stable direct dye; and applying said reduction stable direct dye to said fibrous substrate in the presence of a suitable reducing agent. | |
