Patents by Inventor John C. Stirrat

John C. Stirrat 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).

  • Toner feeder system
    Patent number: 4548490
    Abstract: A toner feeder is provided for use with a magnetic roller to tone electrostatic images. The feeder includes a doctor blade attached to an adjustable block for varying the gap between an edge of the blade and the magnetic roller. The block and blade combine to define a recess above the blade and toner builds up in the recess to present a living wall of toner. This reduces agglomeration and build up of toner lumps. The invention is particularly useful with toners requiring relatively low fusing pressures.
    Type: Grant
    Filed: August 16, 1983
    Date of Patent: October 22, 1985
    Assignee: Delphax Systems
    Inventors: John C. Stirrat, Kenneth L. Hurley, Brian F. Whittaker