Patents by Inventor Frank W. Christianson

Frank W. Christianson 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).

  • Silencer for pneumatic grain conveyor
    Patent number: 4913597
    Abstract: A silencer (70) which is particularly adapted for use with a pneumatic grain conveyor (10) includes a housing (72) with an arrangement of internal baffles (78, 80 and 82) defining a serpentine flow path of increasing cross-sectional area between an inlet (74) and an outlet (76) which is self-cleaning and effects noise reduction without absorptive material that would otherwise quickly clog the silencer.
    Type: Grant
    Filed: August 12, 1987
    Date of Patent: April 3, 1990
    Assignee: Christianson Systems, Inc.
    Inventors: Roy O. Christianson, Frank W. Christianson
  • Cyclone separator with accelerator plate for pneumatic conveyor
    Patent number: 4887936
    Abstract: A cyclone separator (20) for a pneumatic grain conveyor (10) includes a filter assembly (60) mounted in the upper end thereof. The filter assembly (60) includes a cylindrical casing (62) extending into the separator (20) with a screen (70) therein and an adjustable accelerator plate (84) which cleans an adjacent portion of the screen and distributes the collected dust and foreign particles on the remainder of the screen for reduced clogging and fewer operational interruptions to clear the screen.
    Type: Grant
    Filed: August 12, 1987
    Date of Patent: December 19, 1989
    Assignee: Christianson Systems, Inc.
    Inventors: Roy O. Christianson, Frank W. Christianson
  • Pneumatic grain conveyor with universal frame
    Patent number: 4846605
    Abstract: A universal frame (80) which is particularly adapted for use with a pneumatic grain conveyor (10) includes an offset longitudinal tongue (16) and hitch (18) and structural members arranged in interconnected so as to provide a minimal outer periphery which in turn improves versatility and facilitates discharge of the grain into an adjacent trailer or truck.
    Type: Grant
    Filed: August 12, 1987
    Date of Patent: July 11, 1989
    Assignee: Christianson Systems, Inc.
    Inventors: Roy O. Christianson, Frank W. Christianson