TREA

Ralf Graeffe

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  • Porvoo, FI
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Patents Grantslast 30 patents

  • Information Patent Grant

    Electroluminescence structure
    • Patent number 4,488,084
    • Issue date Dec 11, 1984
    • Oy LohJa AB
    • Sven G. Lindfors
    • H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Electroluminescent display component
    • Patent number 4,396,864
    • Issue date Aug 2, 1983
    • Oy LohJa AB
    • Tuomo S. Suntola
    • H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR