Patents by Inventor Steven S. Li

Steven S. Li 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: 4320539
    Abstract: A drain clearing device which effectively employs water pressure to clear a blocked drain where the drain opening is submerged or relatively inaccessible. The drain clearing device comprises a drain sealing member of resiliently compressible material attached to a water supply device having an elongated pipe with a side arm for coupling to a water hose. A plunger valve is mounted in an end of the pipe remote from the sealing member and when activated allows water pressure to clear the blocked drain.
    Type: Grant
    Filed: February 9, 1981
    Date of Patent: March 23, 1982
    Inventor: Steven S. Li
  • Patent number: 4144598
    Abstract: A semi-spherical drain-blocking member of soft rubber fits in a drain opening. A plunger and water supply device extend through the drain-blocking member. The plunger has a plunger member coaxially mounted in a plunger pipe for movement in axial directions and extending at one end out of the drain-blocking member. A water supply pipe extends from the plunger pipe and is coupled to a water hose.
    Type: Grant
    Filed: January 27, 1978
    Date of Patent: March 20, 1979
    Inventor: Steven S. Li