Patents by Inventor Da Wei David Chen

Da Wei David Chen 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).

  • Battery-powered pump for liquid sprayer
    Patent number: 7207500
    Abstract: A pump apparatus for a liquid sprayer is provided having a housing adapted to be releasably connected to a vessel containing liquid to be sprayed. The housing includes an upper portion and a lower portion releasably connected to the upper portion. The upper portion includes at least a pump and an electric motor for driving the pump. The lower portion includes at least a power supply for providing power to the motor.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: April 24, 2007
    Assignee: H.D. Hudson Manufacturing Co.
    Inventors: William A. Hudson, Robert C. Hudson, Jr., Da Wei David Chen