Patents by Inventor David Tat Wai Cheung

David Tat Wai Cheung 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: 5730325
    Abstract: A toy water gun comprises a main housing including provisions for holding a reservoir of water, a nozzle for receiving and discharging water pumped from the reservoir, and a pump housing positioned substantially outside the main housing. The pump housing contains a pump for pumping water from the reservoir to the nozzle. The pump is operated by an actuator which comprises a rotatable driveshaft extending from the main housing to the pump housing, a transmission interconnecting the pump and the driveshaft for operating the pump in response to rotation of the driveshaft, and a drive carried by the main housing and interconnected with the driveshaft for rotating the driveshaft. The drive may comprise a manually operable hand crank rotatably mounted outside the main housing.
    Type: Grant
    Filed: May 20, 1996
    Date of Patent: March 24, 1998
    Inventor: David Tat Wai Cheung