Patents by Inventor Steven J. Butcher

Steven J. Butcher 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).

  • Composite multilayer ceramic structure
    Patent number: 5382865
    Abstract: A composite multilayer ceramic structure which comprises in a single device a plurality of layers of an electrostrictive dielectric material separated by a plurality of electrode layers in which a first portion is adapted to operate as an electrostrictive actuator and a second portion, which is adjacent to the first portion and which is not inherently piezoelectric, is adapted to operate in the same way as a piezoelectric sensor.
    Type: Grant
    Filed: March 26, 1993
    Date of Patent: January 17, 1995
    Assignee: Cookson Group PLC
    Inventors: Steven J. Butcher, James D. Hobby, David H. M. Kings
  • Optical fiber sensor for producing a variable transverse strain in a localized portion of the fiber
    Patent number: 5336883
    Abstract: A sensor assembly 1 comprises an optical fibre 4 and a transducer 23 arranged to apply transverse strain to a localised portion 24 of the fibre. Birefringence effects induced by the fibre strain are remotely sensed to obtain a signal representative of the transducer input which in turn is connected to a current sensing coil 34 thereby enabling electric current in a conductor 32 to be remotely sensed. The localised portion 24 of the fibre 4 is stripped to remove an outer jacket and is embedded in a relatively rigid matrix material. Damage to the fibre and the effects of creep are thereby avoided. The resulting sensor is particularly suited to the measurement of high currents in power distribution systems.
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: August 9, 1994
    Assignee: Focas Limited
    Inventors: James D. Hobby, Steven J. Butcher