Patents by Inventor B. Keith Harshman

B. Keith Harshman 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).

  • Patent number: 10807468
    Abstract: A hydrostatic transaxle with a vent assembly disposed in a port. The vent assembly may include a main fitting having a bottom member having an inner surface forming a floor and a fitting sidewall extending upwardly from the periphery to encircle the floor. A cap is secured to the sidewall and the fitting sidewall, cap and floor form a basin. A valve is disposed in the fitting sidewall. The assembly also includes cylindrical lower section extending downwardly from the bottom member to form a passage between the opening and a sump. A tower extends upwardly from the floor to the vent cap and surrounds an opening in the floor. A passage formed in the tower member to permit fluid flow between the opening and the basin.
    Type: Grant
    Filed: January 22, 2018
    Date of Patent: October 20, 2020
    Assignee: Hydro-Gear Limited Partnership
    Inventors: Ryan S. Buescher, Ryan D. Gagnon, B. Keith Harshman
  • Patent number: 10731625
    Abstract: A thrust bearing assembly is provided for the pistons of a hydrostatic drive motor. The thrust bearing assembly includes first and second retainer components removably interconnected to form a retainer assembly, a thrust bearing captured between and encompassed by the first and second retainer components, and locking tangs extending outward from the first and second retainer components. Corresponding catches are formed on the internal surface of the housing to engage the locking tangs when the thrust bearing assembly is installed in the housing.
    Type: Grant
    Filed: May 24, 2018
    Date of Patent: August 4, 2020
    Assignee: Hydro-Gear Limited Partnership
    Inventors: B. Keith Harshman, Ryan D. Gagnon
  • Patent number: 9181958
    Abstract: A hydrostatic apparatus is disclosed. The hydrostatic apparatus comprises a pump, an input shaft, a fan and a fan shroud. The pump comprises a housing, an end cap, a first end and a second end. The input shaft extending from the first end and the second end of the pump. The fan is attached to one end of the input shaft. The fan shroud is also attached to the pump.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: November 10, 2015
    Assignee: Hydro-Gear Limited Partnership
    Inventors: Thomas Kopel, Thomas A. Roth, Thomas P. Gavin, B. Keith Harshman, Bryce E. Steenburg, Raymond Hauser, Lonnie E. Holder
  • Patent number: 8858198
    Abstract: A hydrostatic apparatus is disclosed. The hydrostatic apparatus comprises a pump, an input shaft, a fan and a fan shroud. The pump comprises a housing, an end cap, a first end and a second end. The input shaft extending from the first end and the second end of the pump. The fan is attached to one end of the input shaft. The fan shroud is also attached to the pump.
    Type: Grant
    Filed: July 19, 2013
    Date of Patent: October 14, 2014
    Assignee: Hydro-Gear Limited Partnership
    Inventors: Thomas Kopel, Thomas A. Roth, Thomas P. Gavin, B. Keith Harshman, Bryce E. Steenburg, Raymond Hauser, Lonnie E. Holder