Patents by Inventor John Sleeman Rogers

John Sleeman Rogers 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).

  • Printing plate water sensing means and method
    Patent number: 4052937
    Abstract: The amount of water present on a lithographic printing plate during printing is determined by measuring the amount of water present on a surface which is other than that of the printing plate but which carries an amount of water related to the amount of water present on the printing plate. The surface upon which the measurement is made may be the surface of a control pad mounted on the printing roller in the gap between opposite ends of the printing plate, the surface of one of the rollers of the damp train applying water to the printing plate, or the surface of an auxiliary roller contacting one of the rollers of the damp train applying water to the printing plate. The amount of water subsequently applied to the printing plate may be regulated in dependence upon the amount of water determined as being already present on the printing plate.
    Type: Grant
    Filed: July 22, 1975
    Date of Patent: October 11, 1977
    Assignee: Vickers Limited
    Inventors: Leslie Edward Lawson, John Sleeman Rogers, Peter Edward Watts