Patents by Inventor Dan Rushton

Dan Rushton 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).

  • High pressure pump and method of reducing fluid mixing within same
    Patent number: 8061328
    Abstract: Mixing of lubrication fluid and pumped fluid within a pump can undermine lubricity of the lubrication fluid and/or contaminate the pumped fluid (e.g. fuel) with lubrication fluid. In order to reduce mixing of fluids within a high pressure pump of the present disclosure, a lubrication fluid is supplied to the high pressure pump. A low pressure pump supplies a second fluid to the high pressure pump. The pressure of the second fluid is increased within at least one piston bore of the high pressure pump. Mixing of the lubrication fluid and the second fluid is reduced by fluidly connecting a weep annulus which is opened to the at least one piston bore to a low pressure pump inlet of the low pressure pump.
    Type: Grant
    Filed: March 9, 2005
    Date of Patent: November 22, 2011
    Assignee: Caterpillar Inc.
    Inventors: Scott F. Shafer, Alan R. Stockner, Greg W. Hefler, Chris L. Stewart, Dan Rushton
  • High pressure pump and method of reducing fluid mixing within same
    Publication number: 20060201484
    Abstract: Mixing of lubrication fluid and pumped fluid within a pump can undermine lubricity of the lubrication fluid and/or contaminate the pumped fluid (e.g. fuel) with lubrication fluid. In order to reduce mixing of fluids within a high pressure pump of the present disclosure, a lubrication fluid is supplied to the high pressure pump. A low pressure pump supplies a second fluid to the high pressure pump. The pressure of the second fluid is increased within at least one piston bore of the high pressure pump. Mixing of the lubrication fluid and the second fluid is reduced by fluidly connecting a weep annulus which is opened to the at least one piston bore to a low pressure pump inlet of the low pressure pump.
    Type: Application
    Filed: March 9, 2005
    Publication date: September 14, 2006
    Inventors: Scott Shafer, Alan Stockner, Greg Hefler, Chris Stewart, Dan Rushton