Patents by Inventor Michael R. Johns

Michael R. Johns 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).

  • Stepper motor controller for microstepping a stepper motor and a method for microstepping a stepper motor
    Patent number: 6140793
    Abstract: A low overhead controller for microstepping a stepper motor and a low overhead method for microstepping a stepper motor. The reduction in overhead in system processor is accomplished by the control circuit which dynamically interpolates motor positions between steps commanded from the processor. Also, the reduction in overhead is accomplished by a microstepping method used to effect microstepping resolution control by employing a stored look-up table which gives a resolution value at a given speed according to a predetermined function.
    Type: Grant
    Filed: August 19, 1999
    Date of Patent: October 31, 2000
    Assignee: Bristol-Myers Squibb Company
    Inventors: Raymond A. Carr, Michael R. Johns