Hans Brettel

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Paris, FR

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Patents Grantslast 30 patents

Information Patent Grant
Method of obtaining a range of colors
- Patent number 6,864,981
- Issue date Mar 8, 2005
- Essilor International (Compagnie Generale d'Optique)
- Françoise Vienot
- G01 - MEASURING TESTING

Patents Applicationslast 30 patents

Information Patent Application
Method of obtaining a range of colors
- Publication number 20030053063
- Publication date Mar 20, 2003
- Francoise Vienot
- G01 - MEASURING TESTING