Patents by Inventor Amy H. Lu

Amy H. Lu 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).

  • Underwater breathing apparatus
    Patent number: 5535734
    Abstract: The present invention provides an underwater breathing device that does not require the use of a pump, engine or pressurized air supply. The invention includes two overlapping hollow cylindrical tubes. The outer tube has holes at its base to let the flow of air move inside the device, up the inside of the outer tube and into the inner tube so that the swimmer can breath in air without any water. The device is constructed to operate whether it is right side up or upside down and can be utilized by more than one swimmer at the same time.
    Type: Grant
    Filed: January 26, 1995
    Date of Patent: July 16, 1996
    Inventors: Mike C. T. Lu, Amy H. Lu