Patents by Inventor Richard D. Neilson

Richard D. Neilson 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).

  • Speed governor
    Patent number: 6854953
    Abstract: The present invention provides a speed governor (5) suitable for use in a fluid driven down-hole tool (3). The speed governor comprises an actuator (7) operatively coupled to a motive fluid flow control valve (6). The actuator is and arranged so as to be activatable, directly or indirectly, in response to the running speed of the tool (3), for opening of the control valve (6) with increasing rotational speed of the motor (3) above a predetermined speed limit thereby to limit the rotational speed of the downhole tool (3).
    Type: Grant
    Filed: August 5, 2002
    Date of Patent: February 15, 2005
    Assignee: Rotech Holdings, Limited
    Inventors: Hector F. A. Van Drentham-Susman, Kenneth Roderick Stewart, Richard D. Neilson, Donald Stewart, Gary L. Harris
  • Speed governor
    Publication number: 20030029308
    Abstract: The present invention provides a speed governor (5) suitable for use in a fluid driven down-hole tool (3). The speed governor comprises an actuator (7) operatively coupled to a motive fluid flow control valve (6). The actuator is and arranged so as to be activatable, directly or indirectly, in response to the running speed of the tool (3), for opening of the control valve (6) with increasing rotational speed of the motor (3) above a predetermined speed limit thereby to limit the rotational speed of the downhole tool (3).
    Type: Application
    Filed: August 5, 2002
    Publication date: February 13, 2003
    Inventors: Hector F. A. Van Drentham-Susman, Kenneth Roderick Stewart, Richard D. Neilson, Donald Stewart, Gary L. Harris