Jean-Francois Dufresne

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Roissy En Brie, FR

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Patents Grantslast 30 patents

Information Patent Grant
Method for obtaining an ophthalmic lens comprising a surface utilit...
- Patent number 6,491,851
- Issue date Dec 10, 2002
- Essilor International Compagnie Generale d'Optique
- Gerhard Keller
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

Patents Applicationslast 30 patents

Information Patent Application
Method for obtaining an ophthalmic lens comprising a surface utilit...
- Publication number 20030075814
- Publication date Apr 24, 2003
- Essilor International Compagnie Generale d'Optique
- Gerhard Keller
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL