Patents by Inventor Joseph S. Y. Liew

Joseph S. Y. Liew 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).

  • Recessed cutting edge for wire cutting gate valves
    Patent number: 8070131
    Abstract: A gate valve having a body, a chamber housed in the body, a passage through the body that intersects the chamber, a gate for selectively opening and closing the valve, and a cutting edge on the gate. The cutting edge can sever any lines that may be in the valve and still seal after closing. The gate includes a recess formed to collect cuttings formed while severing the line.
    Type: Grant
    Filed: October 27, 2008
    Date of Patent: December 6, 2011
    Assignee: Vetco Gray Inc.
    Inventor: Joseph S. Y. Liew
  • Recessed Cutting Edge For Wire Cutting Gate Valves
    Publication number: 20100102263
    Abstract: A gate valve having a body, a chamber housed in the body, a passage through the body that intersects the chamber, a gate for selectively opening and closing the valve, and a cutting edge on the gate. The cutting edge can sever any lines that may be in the valve and still seal after closing. The gate includes a recess formed to collect cuttings formed while severing the line.
    Type: Application
    Filed: October 27, 2008
    Publication date: April 29, 2010
    Applicant: Vetco Gray Inc.
    Inventor: Joseph S. Y. Liew