Patents by Inventor David Anthony Chang

David Anthony Chang 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).

  • Valve control device
    Patent number: 10385986
    Abstract: A valve control device includes a housing provided with a control shaft, a motor for driving the control shaft to rotate, a control circuit board connected to the motor, and a sensor for detecting a rotational position of the control shaft. The sensor is connected to the control circuit board, which controls the motor to drive the control shaft to rotate in response to a position signal returned by the sensor. The valve control device may further include a position pointer, an indicating light, or a buzzer to facilitate observation of the opening and closing position of the valve.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: August 20, 2019
    Inventor: David Anthony Chang
  • Valve Control Device
    Publication number: 20170254434
    Abstract: A valve control device includes a housing provided with a control shaft, a motor for driving the control shaft to rotate, a control circuit board connected to the motor, and a sensor for detecting a rotational position of the control shaft. The sensor is connected to the control circuit board, which controls the motor to drive the control shaft to rotate in response to a position signal returned by the sensor. The valve control device may further include a position pointer, an indicating light, or a buzzer to facilitate observation of the opening and closing position of the valve.
    Type: Application
    Filed: March 6, 2017
    Publication date: September 7, 2017
    Inventor: David Anthony Chang