Patents by Inventor Ian C. A. Leonard

Ian C. A. Leonard 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).

  • Drive mechanism
    Patent number: 4311080
    Abstract: A drive mechanism for driving one or a plurality of displaceable elements around a closed path, such as a circle, constituted by a linear induction actuator associated with means for constraining the displaceable elements to move in the closed path. A capacitive feedback control system determines the position of the element or elements around the path and controls the windings of the linear induction actuator in dependence on an error signal generated therefrom. An open path drive mechanism having a plurality of linear induction actuators and a capacitive feedback control system is also encompassed by the invention as are hybrid linear induction motors using sets of arcuate linear induction actuators around the rim of a reaction member which drives an output shaft of the motor.
    Type: Grant
    Filed: June 20, 1977
    Date of Patent: January 19, 1982
    Assignee: National Research Development Corporation
    Inventor: Ian C. A. Leonard
  • Drive mechanism
    Patent number: 4287808
    Abstract: A drive mechanism for driving one or a plurality of displaceable elements around a closed path, such as a circle, constituted by a linear induction actuator associated with means for constraining the displaceable elements to move in the closed path. A capacitive feedback control system determines the position of the element or elements around the path and controls the windings of the linear induction actuator in dependence on an error signal generated therefrom. An open path drive mechanism having a plurality of linear induction actuators and a capacitive feedback control system is also encompassed by the invention as are hybrid linear induction motors using sets of arcuate linear induction actuators around the rim of a reaction member which drives an output shaft of the motor.
    Type: Grant
    Filed: December 8, 1976
    Date of Patent: September 8, 1981
    Assignee: National Research Development Corp.
    Inventors: Ian C. A. Leonard, Barry E. Jones