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Winfried T. Holfeld
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Wilmington, DE, US
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last 30 patents
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Patent Grant
Wool dyeing utilizing controlled dye addition
Patent number
5,366,511
Issue date
Nov 22, 1994
E. I. Du Pont de Nemours and Company
Winfried T. Holfeld
D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
Information
Patent Grant
Nonaqueous polyamide dyeing process utilizing controlled dye addition
Patent number
5,318,598
Issue date
Jun 7, 1994
E. I. Du Pont de Nemours and Company
Winfried T. Holfeld
D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
Information
Patent Grant
Process for the application of dye fixing agents to polyamide fiber...
Patent number
5,314,504
Issue date
May 24, 1994
E. I. Du Pont de Nemours and Company
Winfried T. Holfeld
D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
Information
Patent Grant
Polyamide dyeing process utilizing controlled anionic dye addition
Patent number
5,230,709
Issue date
Jul 27, 1993
E. I. Du Pont de Nemours and Company
Winfried T. Holfeld
D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
Information
Patent Grant
Process for improving dyeability
Patent number
4,030,880
Issue date
Jun 21, 1977
E. I. Du Pont de Nemours and Company
Winfried Thomas Holfeld
D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...