Patents by Inventor John C. K. Sham

John C. K. Sham 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: 5386612
    Abstract: A vacuum cleaning apparatus is provided which includes a housing having a handle portion and a nozzle portion. A reservoir is defined in the housing for retaining cleaning solution or water, and a heating unit is associated with the reservoir for heating the liquid so as to generate steam for delivery to a flat surface such as a window to be cleaned. A squeegee assembly is mounted to the housing adjacent the nozzle portion for wiping the window after liquid has been deposited thereon. A motor driven fan assembly is disposed within the housing in communication with the nozzle portion for drawing excess liquid and debris into the nozzle portion. The nozzle portion defines structure for separating and containing the liquid which is drawn into the apparatus.
    Type: Grant
    Filed: April 23, 1993
    Date of Patent: February 7, 1995
    Inventor: John C. K. Sham
  • Patent number: 5341541
    Abstract: A portable hand-held steam vacuum cleaner is provided which includes a housing having a handle portion and a nozzle portion. A reservoir is defined in the housing for retaining cleaning solution or water, and a heating unit is associated with the reservoir for heating the liquid so as to generate steam for delivery to a surface to be cleaned. A motor driven fan assembly is disposed within the housing in communication with the nozzle portion for drawing excess liquid and debris into the nozzle portion. The nozzle portion defines structure for separating and containing the liquid which is drawn into the vacuum cleaner.
    Type: Grant
    Filed: September 9, 1992
    Date of Patent: August 30, 1994
    Inventor: John C. K. Sham
  • Patent number: 5144516
    Abstract: A leakage current interrupter device for use with appliances. The device of the present invention includes a switching device having an electromagnet which is energized by a sensing circuit upon the detection of leakage current or a ground fault condition. The magnetic field generated by the electromagnet moves a lever arm to instantaneously interrupt the flow of current through the circuit to disconnect the appliance from the power supply.
    Type: Grant
    Filed: February 4, 1991
    Date of Patent: September 1, 1992
    Assignee: Wing Shing Products Company, Ltd.
    Inventor: John C. K. Sham
  • Patent number: D345671
    Type: Grant
    Filed: June 12, 1991
    Date of Patent: April 5, 1994
    Inventors: John C. K. Sham, Yu S. Kwong
  • Patent number: D346090
    Type: Grant
    Filed: June 12, 1991
    Date of Patent: April 19, 1994
    Inventors: John C. K. Sham, Yu S. Kwong
  • Patent number: D348585
    Type: Grant
    Filed: July 13, 1992
    Date of Patent: July 12, 1994
    Inventor: John C. K. Sham