Patents by Inventor John H. Tholen

John H. Tholen 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).

  • Double-creased lithoplate and method of mounting on a web press
    Patent number: 4643093
    Abstract: To mount a lithoplate onto a plate cylinder of a conventional web press, the lithoplate is double crimped, a stiffener is fitted snugly between the two crimps, and the stiffener and crimped portion of the lithoplate are inserted into a longitudinal channel in a plate cylinder. The invention permits for the first time precision mounting of a lithoplate which has a stretchable base such as a polyester base. A stretchable lithoplate preferably is mounted over underpacking with which it has a high effective coefficient of friction.
    Type: Grant
    Filed: March 1, 1985
    Date of Patent: February 17, 1987
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Richard T. Goar, John H. Tholen
  • Automatic camera for dual printing plates
    Patent number: 3953873
    Abstract: A camera adapted for making a chemically developed printing plate or a more economical dry developed printing plate. The camera has a magazine for supplying selectively one of two types of light sensitive film material, advancing a severed sheet of the selected material to the image plane, and directing that subsequently imaged plate to the associated processing station to produce a developed and ready printing press plate.
    Type: Grant
    Filed: November 13, 1974
    Date of Patent: April 27, 1976
    Assignee: Minnesota Mining & Manufacturing Company
    Inventors: John H. Tholen, John C. Winters