Patents by Inventor Bradley J. Ashbrook

Bradley J. Ashbrook 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).

  • Patent number: 5099158
    Abstract: An improved electromagnetic actuator of the type comprising (a) a first assembly; (b) a second assembly movable relative to the first assembly along an axis of relative movement in response to a command signal, the second assembly comprising magnetic flux source means for defining radially directed flux both in an inward and outward direction relative to the axis of relative movement; (c) coil assembly means for defining at least two coil segments respectively disposed in the paths of the flux in the inward and outward directions; and (d) means for applying the command signal to the coil segments so that a current flows in one direction around the axis through the inward directed flux, and flows in the opposite direction around the axis through the outward directed flux so that the flux/current force applied between the first and second assemblies is additive. In accordance with one aspect of the invention flat magnets and flux focussing elements are used to provide the radially directed flux.
    Type: Grant
    Filed: March 26, 1990
    Date of Patent: March 24, 1992
    Assignee: Aura Systems, Inc.
    Inventors: Keith O. Stuart, Bradley J. Ashbrook, Dennis C. Bulgatz