Stewart G. Helfrich

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Hamburg, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Heather dyed fabric and method of producing same
- Patent number 5,667,533
- Issue date Sep 16, 1997
- The Virkler Company
- Peter J. Hauser
- D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...