Patents by Inventor Walter F. Johnson

Walter F. Johnson 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).

  • Printer calibration mechanism
    Patent number: 11922241
    Abstract: A printing system is disclosed.
    Type: Grant
    Filed: March 13, 2023
    Date of Patent: March 5, 2024
    Assignee: Ricoh Company, Ltd.
    Inventors: Mikel Stanich, Walter F. Kailey, Scott R. Johnson, Pallavi Premkumar, William Manchester
  • Filter for use in dry powder spray coating systems
    Patent number: 5224974
    Abstract: A filter for use in a dry powder spray booth that includes a frame containing a quantity of pleated filter sheet material. The ends and sides of the pleated sheet are secured in the frame by a sealant. The material forming the pleated sheet is a fiber paper having a smooth and rough side and is treated with a flame retardant coating. The surface area of the pleated sheet is varied between five and ten times the interior area of the frame. The smooth side of the fiber paper faces upstream with respect to the air flow and the filter is positioned at an acute angle to the vertical with the top inclined upstream. The frame is provided with a manual vibrator and an expanded wire mesh on the downstream side.
    Type: Grant
    Filed: January 2, 1992
    Date of Patent: July 6, 1993
    Inventor: Walter F. Johnson
  • Liquid to powder spray booth conversion insert
    Patent number: 5103760
    Abstract: A liquid to powder spray booth conversion insert compartment is provided that can be rolled up to a conventional wet paint spray booth to convert it to dry powder usage. A pleated fiber filter having a pore size of 20 microns inclined above powder collection trays is provided to allow collection and reuse of the powdered materials. A prefilter of progressive weave filter material is provided at the input side of the compartment to remove large size matter while allowing the sprayed powder particles to pass therethrough.
    Type: Grant
    Filed: December 17, 1990
    Date of Patent: April 14, 1992
    Inventor: Walter F. Johnson