Patents by Inventor Graeme Dempster

Graeme Dempster 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).

  • Energy dissipation valves for hydraulic cylinders
    Publication number: 20060083640
    Abstract: A hydraulic actuator comprises a cylinder, a piston reciprocatingly received within the cylinder, a piston rod connected to the piston and a pressure release mechanism which allows hydraulic fluid to pass from a first side of the piston to a second side of the piston when the actuator encounters shock loading. This permits the piston to move. The pressure relief mechanism includes a passageway extending from the first side of the piston to the second side of the piston and a valve member adjacent to the passageway which releasably engages the piston. The valve member has a closed position where the valve member closes the passageway and engages the piston. A resilient member biases the valve member towards the closed position. A valve member limiter limits movement of the valve member away from the closed position.
    Type: Application
    Filed: October 7, 2004
    Publication date: April 20, 2006
    Inventors: Mark Ellens, Edward Leite, Graeme Dempster, Jasenn Howe
  • Energy dissipation valves for hydraulic cylinders
    Publication number: 20060083641
    Abstract: A hydraulic actuator comprises a cylinder, a piston reciprocatingly received within the cylinder, a piston rod connected to the piston and a pressure release mechanism which allows hydraulic fluid to pass from a first side of the piston to a second side of the piston when the actuator encounters shock loading. This permits the piston to move. The pressure relief mechanism includes a passageway extending from the first side of the piston to the second side of the piston and a valve member adjacent to the passageway which releasably engages the piston. The valve member has a closed position where the valve member closes the passageway and engages the piston. A resilient member biases the valve member towards the closed position. A valve member limiter limits movement of the valve member away from the closed position.
    Type: Application
    Filed: October 12, 2004
    Publication date: April 20, 2006
    Inventors: Mark Ellens, Edward Leite, Graeme Dempster, Jasenn Howe
  • Moving bed bioreactor carrier
    Patent number: D661778
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: June 12, 2012
    Assignee: Headworks Bio Inc.
    Inventors: Graeme Dempster, Gerald Seidl, Siva Angappan, Jack Collie Gardiner