Patents by Inventor Wong Man Kwan

Wong Man Kwan 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: 4079891
    Abstract: A spray nozzle for a showerhead is controllable to deliver a pulsating spray or a continuous spray or a variable combination of the two. Water entering at the inlet of the nozzle is adjustably divided into two flow paths one of which leads to a group of spray outlets to provide a continuous spray and the other of which leads to a further group of spray outlets via a rotary valve to provide a pulsating spray. The rotary valve comprises a cylindrical valve chamber with a rotary valve member therein, the valve member having turbine blades so that in use water entering at the valve inlet drives the valve member in rotation, and pivoted flaps mounted on the valve member which in use are centrifugally urged against the cylindrical wall of the valve chamber, there to intermittently occlude the further group of spray outlets, which open from the cylindrical wall, and to provide the pulsation in the spray, without jamming the rotary valve member.
    Type: Grant
    Filed: January 21, 1977
    Date of Patent: March 21, 1978
    Inventor: Wong Man Kwan