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Kazuaki Yokoyama

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  • Saitama, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Surface light source device
    • Patent number 6,152,570
    • Issue date Nov 28, 2000
    • Enplas Corporation
    • Kazuaki Yokoyama
    • G02 - OPTICS
  • Information Patent Grant

    Surface light source device
    • Patent number 5,988,826
    • Issue date Nov 23, 1999
    • Enplas Corporation
    • Kazuaki Yokoyama
    • G02 - OPTICS
  • Information Patent Grant

    Surface light source device
    • Patent number 5,971,559
    • Issue date Oct 26, 1999
    • Enplas Corporation
    • Tsuyoshi Ishikawa
    • G02 - OPTICS
  • Information Patent Grant

    Surface light source device
    • Patent number 5,899,552
    • Issue date May 4, 1999
    • Enplas Corporation
    • Kazuaki Yokoyama
    • G02 - OPTICS
  • Information Patent Grant

    Surface light source device
    • Patent number 5,818,555
    • Issue date Oct 6, 1998
    • Enplas Corporation
    • Kazuaki Yokoyama
    • G02 - OPTICS
  • Information Patent Grant

    Surface light source device of side light type
    • Patent number 5,810,464
    • Issue date Sep 22, 1998
    • Enplas Corporation
    • Tsuyoshi Ishikawa
    • G02 - OPTICS
  • Information Patent Grant

    Surface light source device
    • Patent number 5,779,338
    • Issue date Jul 14, 1998
    • Enplas Corporation
    • Tsuyoshi Ishikawa
    • G02 - OPTICS
  • Information Patent Grant

    Surface light source device
    • Patent number 5,769,522
    • Issue date Jun 23, 1998
    • Enplas Corporation
    • Isamu Kaneko
    • G02 - OPTICS
  • Information Patent Grant

    Surface light source device
    • Patent number 5,718,497
    • Issue date Feb 17, 1998
    • Enplas Corporation
    • Kazuaki Yokoyama
    • G02 - OPTICS
  • Information Patent Grant

    Surface light source device
    • Patent number 5,655,827
    • Issue date Aug 12, 1997
    • Enplas Corporation
    • Isamu Kaneko
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Prismatic member with coarsened portions or triangular prismatic an...
    • Patent number 5,600,455
    • Issue date Feb 4, 1997
    • Enplas Corporation
    • Tsuyoshi Ishikawa
    • G02 - OPTICS
  • Information Patent Grant

    Surface light source device
    • Patent number 5,584,556
    • Issue date Dec 17, 1996
    • Enplas Corporation
    • Kazuaki Yokoyama
    • G02 - OPTICS
  • Information Patent Grant

    Surface light source device
    • Patent number 5,575,549
    • Issue date Nov 19, 1996
    • Enplas Corporation
    • Tsuyoshi Ishikawa
    • G02 - OPTICS
  • Information Patent Grant

    Surface light source device
    • Patent number 5,450,292
    • Issue date Sep 12, 1995
    • Enplas Corporation
    • Kazuaki Yokoyama
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Surface light source device
    • Patent number 5,414,599
    • Issue date May 9, 1995
    • Enplas Corporation
    • Isamu Kaneko
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
  • Information Patent Grant

    Surface illuminant device
    • Patent number 5,402,324
    • Issue date Mar 28, 1995
    • Enplas Corporation
    • Kazuaki Yokoyama
    • G02 - OPTICS
  • Information Patent Grant

    Surface light source device
    • Patent number 5,134,549
    • Issue date Jul 28, 1992
    • Enplas Corporation
    • Kazuaki Yokoyama
    • G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS