Inventor
OBRECHT GERARD
FR4 patents
Patents
4 patentsUS5172143ADec 15, 1992
Artificial optical lens and method of manufacturing it
ESSILOR INT65 citations94
US4976534ADec 11, 1990
Simultaneous vision optical lens for correcting presbyopia
ESSILOR INT92 citations93
US4854689AAug 8, 1989
Progressive ophthalmic lens
ESSILOR INT34 citations89
US4796988AJan 10, 1989
Progressive lens
ESSILOR INT22 citations78