Patents by Inventor David Mumford

David Mumford 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).

  • Dual fuel injection valve and method of operating a dual fuel injection valve
    Patent number: 6761325
    Abstract: A dual fuel injection valve separately and independently injects two different fuels into a combustion chamber of an internal combustion engine. A first fuel is delivered to the injection valve at injection pressure and a second fuel is either raised to injection pressure by an intensifier provided within the injection valve, or delivered to the injection valve at injection pressure. Electronically controlled valves control hydraulic pressure in control chambers disposed within the injection valve. The pressure of the hydraulic fluid in these control chambers is employed to independently actuate a hollow outer needle that controls the injection of the first fuel. Disposed within the outer needle is an inner needle that controls the injection of the second fuel. The outer needle closes against a seat associated with the injection valve body and the inner needle closes against a seat associated with the outer needle.
    Type: Grant
    Filed: November 20, 2001
    Date of Patent: July 13, 2004
    Assignee: Westport Research Inc.
    Inventors: S. Michael Baker, David Mumford, Adrian Post, Tim Lennox, Alain M. J. Touchette, Bradley D. Douville
  • Dual fuel injection valve and method of operating a dual fuel injection valve
    Publication number: 20020070295
    Abstract: A dual fuel injection valve separately and independently injects two different fuels into a combustion chamber of an internal combustion engine. A first fuel is delivered to the injection valve at injection pressure and a second fuel is either raised to injection pressure by an intensifier provided within the injection valve, or delivered to the injection valve at injection pressure. Electronically controlled valves control hydraulic pressure in control chambers disposed within the injection valve. The pressure of the hydraulic fluid in these control chambers is employed to independently actuate a hollow outer needle that controls the injection of the first fuel. Disposed within the outer needle is an inner needle that controls the injection of the second fuel. The outer needle closes against a seat associated with the injection valve body and the inner needle closes against a seat associated with the outer needle.
    Type: Application
    Filed: November 20, 2001
    Publication date: June 13, 2002
    Inventors: S. Michael Baker, David Mumford, Adrian Post, Tim Lennox, Alain M.J. Touchette, Bradley D. Douville