Patents by Inventor Christopher REDFERN

Christopher REDFERN 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).

  • Surge margin control
    Patent number: 9341076
    Abstract: A gas turbine engine control system comprising a variable stator vane schedule for normal operation of the gas turbine engine. The system is configured to generate an arm signal indicating potential shaft break. Then the system is configured to alter the variable stator vane schedule to slew each variable stator vane to decrease the available surge margin in response to the arm signal. Or the system is configured to limit a response rate of a variable stator vane actuator in response to the arm signal. Or the system is configured to alter the variable stator vane schedule and limit the response rate of the actuator.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: May 17, 2016
    Assignee: ROLLS-ROYCE plc
    Inventors: Arthur L. Rowe, Christopher Redfern
  • SURGE MARGIN CONTROL
    Publication number: 20120317955
    Abstract: A gas turbine engine control system comprising a variable stator vane schedule for normal operation of the gas turbine engine. The system is configured to generate an arm signal indicating potential shaft break. Then the system is configured to alter the variable stator vane schedule to slew each variable stator vane to decrease the available surge margin in response to the arm signal. Or the system is configured to limit a response rate of a variable stator vane actuator in response to the arm signal. Or the system is configured to alter the variable stator vane schedule and limit the response rate of the actuator.
    Type: Application
    Filed: June 11, 2012
    Publication date: December 20, 2012
    Applicant: ROLLS-ROYCE PLC
    Inventors: Arthur L. ROWE, Christopher REDFERN
  • Seat frame
    Patent number: D577518
    Type: Grant
    Filed: April 10, 2008
    Date of Patent: September 30, 2008
    Assignee: Emeco Industries, Inc.
    Inventors: Christopher Redfern, legal representative, Ettore Sottsass
  • Luminaire
    Patent number: D777967
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: January 31, 2017
    Assignee: ZUMTOBEL LIGHTING GMBH
    Inventor: Christopher Redfern
  • Luminaire
    Patent number: D777968
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: January 31, 2017
    Assignee: ZUMTOBEL LIGHTING GMBH
    Inventor: Christopher Redfern
  • Luminaire
    Patent number: D779100
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: February 14, 2017
    Assignee: ZUMTOBEL LIGHTING GMBH
    Inventor: Christopher Redfern
  • Luminaire
    Patent number: D779101
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: February 14, 2017
    Assignee: ZUMTOBEL LIGHTING GMBH
    Inventor: Christopher Redfern
  • Luminaire
    Patent number: D786472
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: May 9, 2017
    Assignee: ZUMTOBEL LIGHTING GMBH
    Inventor: Christopher Redfern
  • Luminaire
    Patent number: D810345
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: February 13, 2018
    Assignee: ZUMTOBEL LIGHTING GMBH
    Inventor: Christopher Redfern
  • Luminaire
    Patent number: D838892
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: January 22, 2019
    Assignee: ZUMTOBEL LIGHTING GMBH
    Inventor: Christopher Redfern