Patents by Inventor John E. Parkinson

John E. Parkinson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Processing of exposed lithographic printing plates by conducting second exposure under water
    Patent number: 4927741
    Abstract: The invention relates to an automatic machine for the reversal processing of lithographic printing plates which are required to be exposed overall after heating. The method and apparatus of the invention provide that the exposure be effected while the plates are being conveyed through water in a shallow bath.
    Type: Grant
    Filed: November 14, 1988
    Date of Patent: May 22, 1990
    Assignee: Horsell Graphic Industries Limited
    Inventors: Peter Garth, Stuart M. Simpson, John E. Parkinson, Alan H. Rogers