Patents by Inventor Gerard ter Horst

Gerard ter Horst 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).

  • Rotary valve actuators having partial stroke damping apparatus
    Patent number: 8567752
    Abstract: Rotary valve actuators having partial stroke damping apparatus are described herein. An example rotary valve actuator described herein includes a housing containing a first piston and a second piston opposite the first piston, where the pistons move in opposite directions to rotate a shaft of the rotary valve actuator. A damper is operatively coupled to at least one of the first piston or the second piston to slow the movement of the piston for only a portion of a stroke of the rotary valve actuator.
    Type: Grant
    Filed: September 2, 2009
    Date of Patent: October 29, 2013
    Assignee: Emerson Process Management, Valve Automation Inc.
    Inventors: Gerard ter Horst, Erwin van Dorp
  • ROTARY VALVE ACTUATORS HAVING PARTIAL STROKE DAMPING APPARATUS
    Publication number: 20110049400
    Abstract: Rotary valve actuators having partial stroke damping apparatus are described herein. An example rotary valve actuator described herein includes a housing containing a first piston and a second piston opposite the first piston, where the pistons move in opposite directions to rotate a shaft of the rotary valve actuator. A damper is operatively coupled to at least one of the first piston or the second piston to slow the movement of the piston for only a portion of a stroke of the rotary valve actuator.
    Type: Application
    Filed: September 2, 2009
    Publication date: March 3, 2011
    Inventors: Gerard ter Horst, Erwin van Dorp