Patents by Inventor William Field

William Field 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).

  • Pipe plug
    Patent number: 7225836
    Abstract: A pipe plug apparatus configured for insertion into a section of pipe and adapted to radially expand so as to engage the inner surface of the pipe and form a positive seal therewith. The pipe plug is preferably configurable from a non-sealing configuration wherein radially expandable seals are relaxed by application of pressure from a compressed fluid, to a spring biased sealing configuration automatically upon release of the pressure. A positive seal is automatically formed and maintained by spring biased axial compression.
    Type: Grant
    Filed: November 12, 2005
    Date of Patent: June 5, 2007
    Inventor: William Field
  • Pipe plug
    Publication number: 20060225801
    Abstract: A pipe plug apparatus configured for insertion into a section of pipe and adapted to radially expand so as to engage the inner surface of the pipe and form a positive seal therewith. The pipe plug is preferably configurable from a non-sealing configuration wherein radially expandable seals are relaxed by application of pressure from a compressed fluid, to a spring biased sealing configuration automatically upon release of the pressure. A positive seal is automatically formed and maintained by spring biased axial compression.
    Type: Application
    Filed: November 12, 2005
    Publication date: October 12, 2006
    Inventor: William Field
  • Pipe plug
    Patent number: 6966343
    Abstract: A pipe plug apparatus configured for insertion into a section of pipe and adapted to radially expand so as to engage the inner surface of the pipe and form a positive seal therewith. The pipe plug is preferably configurable from a non-sealing configuration wherein radailly expandable seals are relaxed by application of pressure from a compressed fluid, to a spring biased sealing configuration automatically upon release of the pressure. A positive seal is automatically formed and maintained by spring biased axial compression.
    Type: Grant
    Filed: April 11, 2005
    Date of Patent: November 22, 2005
    Inventor: William Field