Patents by Inventor Wan-Tsai Li

Wan-Tsai 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: 6132172
    Abstract: An improved windmill includes a conical rotor unit, a frame for supporting the conical rotor unit and a base for supporting the frame. The conical rotor unit has a conical rotor with a plurality of spaced curved blades disposed thereon and a plurality of spaced slant blades located at an outer rim of the conical rotor. The conical rotor has small wind resistance and may rotate under low speed wind to generate rotor rotation. The frame is rotationable about the base to enable the conical rotor to capture wind from different directions. The conical rotor is heavier than conventional windmill rotor and may serve as a fly wheel to store kinetic energy for the windmill to produce steady rotation under different wind speed for a long period of time.
    Type: Grant
    Filed: June 7, 1999
    Date of Patent: October 17, 2000
    Inventor: Wan-Tsai Li
  • Patent number: 5910688
    Abstract: An improvement for windmill includes a rotor unit, a transmission unit and a stabilizer. The rotor unit includes a plural number of blades with one end riveting to an annular outer ring and another end being twisted at an angle to engage with the slots formed in the hub of the rotor unit. The transmission unit includes a transmission box, an input shaft to receive wind generating power from the rotor unit and an output spindle for delivering output power for productive use. The stabilizer connects with the transmission unit at an opposite side to the rotor unit. The stabilizer has a tail fin for reducing the swaying of the windmill in the wind.
    Type: Grant
    Filed: May 12, 1997
    Date of Patent: June 8, 1999
    Inventor: Wan-Tsai Li