Patents by Inventor Donald R. Friedland

Donald R. Friedland 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 ink mixing apparatus
    Patent number: 5236263
    Abstract: An apparatus to mix printing inks consisting of a mixing container having a single power source for rotating the container and the mixing blade therein with an automatic safety power shut off upon detachment of the mixing blade and a guard member about the rotating container.
    Type: Grant
    Filed: October 8, 1992
    Date of Patent: August 17, 1993
    Inventor: Donald R. Friedland
  • Liquid mixing apparatus
    Patent number: 4720194
    Abstract: Apparatus mixing printing inks consisting of two or more mixing containers having a single power source for rotating both the containers and the mixing blades therein and being arranged to rotate the containers and their respective mixing blades individually or collectively.
    Type: Grant
    Filed: January 16, 1987
    Date of Patent: January 19, 1988
    Inventor: Donald R. Friedland