TREA

Robert F. Johnston

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  • Wildwood, IL, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Automatic calibration for D.C. transducers
    • Patent number 4,459,475
    • Issue date Jul 10, 1984
    • Bell & Howell Company
    • John R. Flint
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    Reversible ribbon drive
    • Patent number 4,448,364
    • Issue date May 15, 1984
    • Bell & Howell Company
    • Richard Frystak
    • B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
  • Information Patent Grant

    Microfiche reader
    • Patent number 4,120,573
    • Issue date Oct 17, 1978
    • Bell & Howell Company
    • Robert F. Johnston
    • G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
  • Information Patent Grant

    Automatic focusing system
    • Patent number 4,032,934
    • Issue date Jun 28, 1977
    • Kenneth L. Hendrickson
    • G02 - OPTICS
  • Information Patent Grant

    Photoreceptor assembly for automatic focusing system
    • Patent number 3,984,846
    • Issue date Oct 5, 1976
    • John A. Gallagher
    • G02 - OPTICS