Patents by Inventor John R. Sigman

John R. Sigman 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).

  • Publication number: 20030131463
    Abstract: An extractor tool for removing and replacing a plumbing fixture, such as a leaking, rusted tub shoe flange with or without cross hairs, includes a shaft having left-handed threads over most of its length and a frusto-conical wedge near one end terminating in a plurality of axial lugs forming a castle around an axial recess, the other end of the shaft being flatted to receive a wrench. A plurality of separate, arcuate shaped, shoes are slidably positioned around the threaded portion of the shaft and are maintained there by a flexible o-ring forming an expandable body having a central bore portion and at least the inner end adjacent the frusto-conical wedge of the shaft formed with a tapered circular recess. A washer and nut are assembled on the shaft from the threaded end. Both inner ends of the shoes may be formed with the tapered circular recess to make them reversible. The outside surfaces of the shoes and lugs may be knurled for added gripping.
    Type: Application
    Filed: January 16, 2002
    Publication date: July 17, 2003
    Inventor: John R. Sigman
  • Patent number: 6343411
    Abstract: An extractor tool for removing and replacing a plumbing fixture, such as a leaking, rusted tub shoe flange with or without cross hairs, includes a shaft having left-handed threads over most of its length and a frusto-conical wedge near one end terminating in a plurality of axial lugs forming a castle around an axial recess, the other end of the shaft being flatted to receive a wrench. A plurality of separate, arcuate shaped, shoes are slidably positioned around the threaded portion of the shaft and are maintained there by a flexible o-ring forming an expandable body having a central bore portion and at least the inner end adjacent the frusto-conical wedge of the shaft formed with a tapered circular recess. A washer and nut are assembled on the shaft from the threaded end. Both inner ends of the shoes may be formed with the tapered circular recess to make them reversible. The outside surfaces of the shoes and lugs may be knurled for added gripping.
    Type: Grant
    Filed: February 28, 2000
    Date of Patent: February 5, 2002
    Inventor: John R. Sigman