Patents by Inventor Chuan Hao Chao

Chuan Hao Chao 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).

  • Door bell with compact profile
    Patent number: 8026826
    Abstract: A door bell includes a case and a frame is located within the open space of the case. An electro-magnetic valve is connected to the frame and controls two hit pins and a circuit board is connected to the frame and electronically connected to the electro-magnetic valve. Two resilient members are mounted to the hit pins which hit a sound plate located beneath the hit pins to generate sound. The sound is amplified by two sound boxes. The circuit board transfers alternative current into direct current so that no hulky part projecting from the door bell.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: September 27, 2011
    Inventor: Chuan Hao Chao
  • DOOR BELL WITH COMPACT PROFILE
    Publication number: 20100231366
    Abstract: A door bell includes a case and a frame is located within the open space of the case. An electromagnetic valve is connected to the frame and controls two hit pins and a circuit board is connected to the frame and electronically connected to the electromagnetic valve. Two resilient members are mounted to the hit pins which hit a sound plate located beneath the hit pins to generate sound. The sound is amplified by two sound boxes. The circuit board transfers alternative current into direct current so that no hulky part projecting from the door bell.
    Type: Application
    Filed: March 12, 2009
    Publication date: September 16, 2010
    Inventor: CHUAN HAO CHAO