Patents by Inventor John Boldt

John Boldt 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).

  • Color printer
    Patent number: 4469459
    Abstract: A color impact matrix printer has replaceable color cartridges which are selectively brought into cooperative engagement with a print head. The printer includes a powered manifold for adjusting the print gap, a cartridge housing which is rapidly moveable by a lever system and a ribbon drive mechanism which allows for selective and incremental driving of each cartridge.
    Type: Grant
    Filed: April 21, 1982
    Date of Patent: September 4, 1984
    Assignee: Envision Technology, Inc.
    Inventors: Richard Trezise, John Boldt, Keith Gnutzman
  • Cartridge for matrix printer
    Patent number: 4448556
    Abstract: A ribbon cartridge for a matrix printer includes a capstan which is driven by an outboard gear accessible by a driver located on the printer from either the top or bottom. This allows cartridges to be closely stacked on a single carriage.
    Type: Grant
    Filed: April 21, 1982
    Date of Patent: May 15, 1984
    Assignee: Chroma
    Inventors: Richard Trezise, John Boldt, Keith Gnutzman