Patents by Inventor Jeffrey A. Tyler

Jeffrey A. Tyler 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: 6883320
    Abstract: A servomechanism for a valve controlling engine intake flow via a cooler and a bypass uses a proportional solenoid operating a hydraulic valve to power a hydraulic actuator setting the position of the control valve. An engine sensor and electric controller provide input to the proportional solenoid, and feedback from the position of the control valve is applied to the hydraulic valve by a cam and spring applying a force in opposition to the proportional solenoid.
    Type: Grant
    Filed: July 8, 2003
    Date of Patent: April 26, 2005
    Assignee: G. W. Lisk Company, Inc.
    Inventor: Jeffrey A. Tyler
  • Patent number: 6601821
    Abstract: A two-stage proportional control valve assembly regulates flow of a first fluid such as an engine exhaust gas using a second fluid such as engine oil for power. A directional valve under control of an electrical actuator regulates flows of the second fluid to operate a fluid-powered actuator. A mechanical connection between the fluid powered actuator and a flow control valve for regulating flows of the first fluid enables the electrical actuator to indirectly control the flow control valve with a minimum draw.
    Type: Grant
    Filed: November 15, 2001
    Date of Patent: August 5, 2003
    Assignee: G. W. Lisk Company, Inc.
    Inventor: Jeffrey A. Tyler
  • Publication number: 20020066441
    Abstract: A two-stage proportional control valve assembly regulates flow of a first fluid such as an engine exhaust gas using a second fluid such as engine oil for power. A directional valve under control of an electrical actuator regulates flows of the second fluid to operate a fluid-powered actuator. A mechanical connection between the fluid powered actuator and a flow control valve for regulating flows of the first fluid enables the electrical actuator to indirectly control the flow control valve with a minimum draw.
    Type: Application
    Filed: November 15, 2001
    Publication date: June 6, 2002
    Inventor: Jeffrey A. Tyler
  • Patent number: 5306076
    Abstract: A directional valve (170) includes an actuator (92, 144) responsive to feedback pressure from a closed volume load (182) for regulating fluid pressure of the load proportional to an electric signal (172). A double-acting cylinder (64, 148) has a plunger (58, 150) operatively associated with the actuator (92, 144) for opposing movement of the actuator proportional to the feedback pressure of the closed volume load. Opposite faces (66, 68 and 156, 158) of the plunger (58, 150) are arranged to balance the directional valve (170) against working pressure within the valve and to control the magnitude of the feedback force opposing movement of the actuator (92, 144).
    Type: Grant
    Filed: May 20, 1992
    Date of Patent: April 26, 1994
    Assignee: G. W. Lisk Company, Inc.
    Inventor: Jeffrey A. Tyler