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Donald E. Hallam
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Wilmington, DE, US
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last 30 patents
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Patent Grant
Apparatus and process for forming alternate twist plied yarn and pr...
Patent number
5,012,636
Issue date
May 7, 1991
E. I. Du Pont de Nemours and Company
Donald E. Hallam
D02 - YARNS MECHANICAL FINISHING OF YARNS OR ROPES WARPING OR BEAMING
Information
Patent Grant
Apparatus and process for forming alternate twist plied yarn and pr...
Patent number
5,003,763
Issue date
Apr 2, 1991
E. I. Du Pont de Nemours and Company
Donald E. Hallam
D02 - YARNS MECHANICAL FINISHING OF YARNS OR ROPES WARPING OR BEAMING
Information
Patent Grant
Apparatus and process for forming alternate twist plied yarn
Patent number
4,873,821
Issue date
Oct 17, 1989
E. I. Du Pont de Nemours and Company
Donald E. Hallam
D02 - YARNS MECHANICAL FINISHING OF YARNS OR ROPES WARPING OR BEAMING