TREA

Walter Hrastnik

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  • Chicago, IL, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Wet modular film printer
    • Patent number 4,367,039
    • Issue date Jan 4, 1983
    • Bell & Howell Company
    • Walter Hrastnik
    • G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
  • Information Patent Grant

    Printing head assembly
    • Patent number 4,155,646
    • Issue date May 22, 1979
    • Bell & Howell Company
    • Walter Hrastnik
    • G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
  • Information Patent Grant

    Photographic film printer
    • Patent number 4,154,528
    • Issue date May 15, 1979
    • Bell & Howell Company
    • Charles J. Watson
    • G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
  • Information Patent Grant

    Light valve system for motion picture film printer
    • Patent number 4,108,537
    • Issue date Aug 22, 1978
    • Bell & Howell Company
    • Charles J. Watson
    • G02 - OPTICS