Patents by Inventor Mark Raymond Duffy

Mark Raymond Duffy 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).

  • Positive sealing proportional control valve with sealable vent valve
    Patent number: 10331145
    Abstract: The proportional control valve for a fuel pump has a metering assembly within a tightly fit bore and a vent valve. The metering assembly includes a metering piston assembly, a piston biasing spring, an armature and a vent valve. The vent valve, such as a ball, is affixed to the armature and the metering piston assembly is configured around the vent valve in a manner that couples the metering piston to the armature. The metering piston assembly comprises a metering piston and a vent valve seat, permanently joined together, which contain a seal and a seat surface respectively between which the vent valve is permitted to move during the operation of the proportional control valve.
    Type: Grant
    Filed: January 30, 2017
    Date of Patent: June 25, 2019
    Assignee: Stanadyne LLC
    Inventor: Mark Raymond Duffy
  • Positive Sealing Proportional Control Valve With Sealable Vent Valve
    Publication number: 20180217619
    Abstract: The proportional control valve for a fuel pump has a metering assembly within a tightly fit bore and a vent valve. The metering assembly includes a metering piston assembly, a piston biasing spring, an armature and a vent valve. The vent valve, such as a ball, is affixed to the armature and the metering piston assembly is configured around the vent valve in a manner that couples the metering piston to the armature. The metering piston assembly comprises a metering piston and a vent valve seat, permanently joined together, which contain a seal and a seat surface respectively between which the vent valve is permitted to move during the operation of the proportional control valve.
    Type: Application
    Filed: January 30, 2017
    Publication date: August 2, 2018
    Inventor: Mark Raymond Duffy