Richard E. Ludwig

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Newtown Square, PA, US

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Patents Grantslast 30 patents

Information 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
Information 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