TREA

Martin Berkenkopf

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  • Pfungstadt, DE
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Patents Grantslast 30 patents

  • Information 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
  • Information 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