Patents by Inventor Wen-Chung Pai

Wen-Chung Pai 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: 5167877
    Abstract: An air purifier with perfume dispensing control, comprising a base plate which has a controller and an air pump, a stepped cap mounted on said base plate at the top for holding a plurality of perfume dispensers, a rotary table mounted on said stepped cap and said perfume dispensers at the top, a hood for securing said stepped cap, said perfume dispensers and said rotary table to said base plate, a trigger arm assembly controlled by an electromagnet to alternatively move back and forth causing said rotary table to rotate, and a stop arm assembly to stop said rotary table from reverse rotation. Compressed air from the pump is alternatively delivered to the perfume dispensers while the rotary table is caused to rotate, causing the perfume dispensers to give off different pleasant smells.
    Type: Grant
    Filed: December 10, 1991
    Date of Patent: December 1, 1992
    Inventor: Wen-Chung Pai