Patents by Inventor Andrew Mark Withers

Andrew Mark Withers 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 actuators
    Patent number: 8118276
    Abstract: A valve actuator having an electric drive motor with a motor shaft and having an output shaft linked to the motor shaft to drive movement of a valve, the actuator further having a control system arranged to provide a first closed loop control of the actuator output shaft and including a controller coupled to a first position sensor to sense the position of the actuator output shaft, and to a second position sensor to sense the position of the motor shaft and to enable determination of the speed of the motor shaft, the control system being configured to respond to sensed signals from the first and second sensors and adjust the motor speed/position accordingly.
    Type: Grant
    Filed: July 9, 2007
    Date of Patent: February 21, 2012
    Assignee: Rotork Controls Limited
    Inventors: Peter George Sanders, Hemendra Parakrama Bandara Dassanayake, Andrew Mark Withers
  • VALVE ACTUATORS
    Publication number: 20090230338
    Abstract: A valve actuator having an electric drive motor with a motor shaft and having an output shaft linked to the motor shaft to drive movement of a valve, the actuator further having a control system arranged to provide a first closed loop control of the actuator output shaft and including a controller coupled to a first position sensor to sense the position of the actuator output shaft, and to a second position sensor to sense the position of the motor shaft and to enable determination of the speed of the motor shaft, the control system being configured to respond to sensed signals from the first and second sensors and adjust the motor speed/position accordingly.
    Type: Application
    Filed: July 9, 2007
    Publication date: September 17, 2009
    Inventors: Peter George Sanders, Hemendra Parakrama Bandara Dassanayake, Andrew Mark Withers