Patents by Inventor Chang-Fei M. Yang

Chang-Fei M. Yang 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).

  • Plunger packing with wedge seal having extrusion recess
    Patent number: 9249797
    Abstract: A seal assembly is disposed in an annular recess in a cylinder chamber between a pump cavity and a pump exterior. The seal assembly includes a main seal and a back-up seal and seals to a pump plunger disposed within the cylinder chamber. The back-up seal includes an extrusion recess extending from a surface of the back-up seal adjacent the main seal along an inner or an outer diameter of the back-up seal. During pumping operations the plunger strokes through the cylinder chamber causing the main seal to extrude into the extrusion recess to form a seal between the plunger and the cylinder chamber.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: February 2, 2016
    Assignee: S.P.M. Flow Control, Inc.
    Inventors: Joseph H. Byrne, Chang-Fei M. Yang
  • PLUNGER PACKING WITH WEDGE SEAL HAVING EXTRUSION RECESS
    Publication number: 20120152111
    Abstract: A seal assembly is disposed in an annular recess in a cylinder chamber between a pump cavity and a pump exterior. The seal assembly includes a main seal and a back-up seal and seals to a pump plunger disposed within the cylinder chamber. The back-up seal includes an extrusion recess extending from a surface of the back-up seal adjacent the main seal along an inner or an outer diameter of the back-up seal. During pumping operations the plunger strokes through the cylinder chamber causing the main seal to extrude into the extrusion recess to form a seal between the plunger and the cylinder chamber.
    Type: Application
    Filed: December 16, 2011
    Publication date: June 21, 2012
    Applicant: S.P.M. FLOW CONTROL, INC.
    Inventors: Joseph H. Byrne, Chang-Fei M. Yang