Patents by Inventor Tvasta David Strafford

Tvasta David Strafford 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).

  • Deterministic magnetorheological finishing
    Patent number: 6106380
    Abstract: A method and apparatus for finishing a workpiece surface using MR fluid is provided wherein the workpiece is positioned near a carrier surface such that a converging gap is defined between a portion of the workpiece surface and the carrier surface; a magnetic field is applied substantially at said gap; a flow of stiffened MR fluid is introduced into said converging gap such that a work zone is created in the MR fluid to form a sub-aperture transient finishing tool for engaging and causing material removal at the portion of the workpiece surface; and the workpiece or the work zone is moved relative to the other to expose different portions of the workpiece surface to the work zone for predetermined time periods to selectively finish said portions of said workpiece surface to predetermined degrees.
    Type: Grant
    Filed: February 19, 1998
    Date of Patent: August 22, 2000
    Assignee: Byelocorp Scientific, Inc.
    Inventors: Stephen David Jacobs, William Kordonski, Igor Victorovich Prokhorov, Donald Golini, Gennadii Rafailovich Gorodkin, Tvasta David Strafford
  • Apparatus deterministic magnetorheological finishing of workpieces
    Patent number: 5839944
    Abstract: A method and apparatus for finishing a workpiece surface using MR fluid is provided wherein the workpiece is positioned near a carrier surface such that a converging gap is defined between a portion of the workpiece surface and the carrier surface; a magnetic field is applied substantially at said gap; a flow of stiffened MR fluid is introduced into said converging gap such that a work zone is created in the MR fluid to form a sub-aperture transient finishing tool for engaging and causing material removal at the portion of the workpiece surface; and the workpiece or the work zone is moved relative to the other to expose different portions of the workpiece surface to the work zone for predetermined time periods to selectively finish said portions of said workpiece surface to predetermined degrees.
    Type: Grant
    Filed: July 14, 1997
    Date of Patent: November 24, 1998
    Assignees: Byelocorp, Inc., University of Rochester
    Inventors: Stephen David Jacobs, William Kordonski, Igor Victorovich Prokhorov, Donald Golini, Gennadii Rafailovich Gorodkin, Tvasta David Strafford
  • Magnetorheological fluid composition
    Patent number: 5804095
    Abstract: A magnetorheological fluid comprises non-colloidal magnetic particles, an abrasive, water, glycerol, and an alkaline buffer. The abrasive may be CeO.sub.2, the non-colloidal magnetic particles may be carbonyl iron, and the alkaline buffer may be Na.sub.2 CO.sub.3. The fluid is useful for magnetorheological finishing.
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: September 8, 1998
    Assignees: Byelocorp Scientific, Inc., University of Rochester
    Inventors: Stephen David Jacobs, William Kordonski, Igor Victorovich Prokhorov, Donald Golini, Gennadii Rafailovich Gorodkin, Tvasta David Strafford
  • Deterministic magnetorheological finishing
    Patent number: 5795212
    Abstract: A method and apparatus for finishing a workpiece surface using MR fluid is provided wherein the workpiece is positioned near a carrier surface such that a converging gap is defined between a portion of the workpiece surface and the carrier surface; a magnetic field is applied substantially at said gap; a flow of stiffened MR fluid is introduced into said converging gap such that a work zone is created in the MR fluid to form a sub-aperture transient finishing tool for engaging and causing material removal at the portion of the workpiece surface; and the workpiece or the work zone is moved relative to the other to expose different portions of the workpiece surface to the work zone for predetermined time periods to selectively finish said portions of said workpiece surface to predetermined degrees.
    Type: Grant
    Filed: October 16, 1995
    Date of Patent: August 18, 1998
    Assignees: Byelocorp Scientific, Inc., University of Rochester
    Inventors: Stephen David Jacobs, William Kordonski, Igor Victorovich Prokhorov, Donald Golini, Gennadii Rafailovich Gorodkin, Tvasta David Strafford