Patents by Inventor Randolph Frank Wojcik

Randolph Frank Wojcik 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: 7057390
    Abstract: An improved raster magnet driver for a linear particle beam is based on an H-bridge technique. Four branches of power HEXFETs form a two-by-two switch. Switching the HEXFETs in a predetermined order and at the right frequency produces a triangular current waveform. An H-bridge controller controls switching sequence and timing. The magnetic field of the coil follows the shape of the waveform and thus steers the beam using a triangular rather than a sinusoidal waveform. The system produces a raster pattern having a highly uniform raster density distribution, eliminates target heating from non-uniform raster density distributions, and produces higher levels of beam current.
    Type: Grant
    Filed: September 20, 2004
    Date of Patent: June 6, 2006
    Assignee: Southeastern Univ. Research Assn.
    Inventors: Nikolai I. Sinkine, Chen Yan, Cornelis Apeldoorn, Jeffrey Glenn Dail, Randolph Frank Wojcik, William Gunning
  • Patent number: 5896483
    Abstract: A liquid light guide system for ultraviolet light is disclosed that has a light shaping arrangement for the emitted light, a stable liquid core and sheath and reliable and effective end closures. The end closures include a metal crimping arrangement that utilizes two layers of deformable materials to prevent cracking of endplugs.
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: April 20, 1999
    Assignee: Southeastern Univ. Research Assn., Inc.
    Inventors: Randolph Frank Wojcik, Stanislaw Majewski, Carl John Zorn, Brian Kross
  • Patent number: 5859946
    Abstract: A termination for a light guide having optical cladding tubing and a liquid core includes a volumetric change device configured to allow fluid flow out of the tubing whenever the liquid core expands and to allow fluid flow into the tubing whenever the liquid core contracts, an end plug fixed to the tubing to retain the liquid in the liquid core within the tubing and the end piece and a crimping piece for holding the end plug in place.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: January 12, 1999
    Assignee: Southeastern Univ. Research Assn.
    Inventors: Randolph Frank Wojcik, Stanislaw Majewski, Carl John Zorn