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Richard E. Ludwig
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Newtown Square, PA, US
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last 30 patents
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Patent Grant
Security paper from film-fibril sheets
Patent number
4,310,591
Issue date
Jan 12, 1982
E. I. Du Pont de Nemours and Company
Chi C. Lee
D04 - BRAIDING LACE-MAKING KNITTING TRIMMINGS NON-WOVEN FABRICS
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Patent Grant
Process for making security paper from film-fibril sheets
Patent number
4,247,318
Issue date
Jan 27, 1981
E. I. Du Pont de Nemours and Company
Chi C. Lee
D04 - BRAIDING LACE-MAKING KNITTING TRIMMINGS NON-WOVEN FABRICS