Patents by Inventor Jiing Lai Chang

Jiing Lai Chang 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).

  • Automatic termination and alarm structure for motors used in versatile vacuum cleaner
    Patent number: 4776060
    Abstract: A multi-purpose vacuum cleaner for solids and liquids includes a motor mounting seat covering the vacuum cleaner tank and having a circular orifice, a filter cage mounted about the orifice on the underside of the motor mounting seat containing a spherical float, and a switch connected to the float so as to be operated when liquid in the tank reaches a predetermined level. Rising of liquid in the tank to the predetermined level lifts the float to obstruct the orifice, preventing liquid from entering the motor, and actuates the switch to disconnect power from the motor and to energize an alarm.
    Type: Grant
    Filed: May 11, 1987
    Date of Patent: October 11, 1988
    Inventor: Jiing Lai Chang