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Udo Fischer
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Darmstadt, DE
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last 30 patents
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Patent Grant
Process for manufacture of fresnel lenses
Patent number
5,870,233
Issue date
Feb 9, 1999
Roehm GmbH Chemische Fabrik
Volker Benz
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Patent Grant
Process for manufacture of Fresnel lenses
Patent number
5,656,209
Issue date
Aug 12, 1997
Roehm GmbH Chemische Fabrik
Volker Benz
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL