Patents by Inventor Song How Wong-Jessel

Song How Wong-Jessel 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).

  • Disk drive platter using sputter shadows thereon for determining orientation thereof
    Patent number: 6567240
    Abstract: A disk for a disk drive uses a circular platter having first and second sides and a circumferential edge. The circumferential edge of the disk has four symmetrically spaced apart shadows and a fifth or additional shadow that gives the disk an asymmetrical shadow signature. The fifth shadow is offset relative to the other shadows, which have congruent arcuate lengths and separation. The fifth shadow has an arcuate length that is about half as long as those of the other shadows, and is closely spaced adjacent to one of the other shadows. The asymmetric shadow signatures of the disk is used to precisely determine both the circumferential position of the platters and their planar orientation (i.e., A-side or B-side). For example, when the disk is mounted on a tool spindle and rotated, an optical detector detects the pattern of the shadows and feeds the data to a computer system. The rotational position of the spindle also is relayed to the computer for coordinating the processing of the rotating disk.
    Type: Grant
    Filed: February 26, 2001
    Date of Patent: May 20, 2003
    Assignee: International Business Machines Corporation
    Inventors: Bradley Frederick Baumgartner, Andrew John Buhler, Erich Chuh, Hang Fai Ngo, Alma Lujan Ortega-Avery, Bob C. Robinson, Song How Wong-Jessel, Elmer Tyree York
  • Apparatus and method of using sputter shadows on disk for determining orientation thereof
    Publication number: 20020118630
    Abstract: A disk for a disk drive uses a circular platter having first and second sides and a circumferential edge. The circumferential edge of the disk has four symmetrically spaced apart shadows and a fifth or additional shadow that gives the disk an asymmetrical shadow signature. The fifth shadow is offset relative to the other shadows, which have congruent arcuate lengths and separation. The fifth shadow has an arcuate length that is about half as long as those of the other shadows, and is closely spaced adjacent to one of the other shadows. The asymmetric shadow signatures of the disk is used to precisely determine both the circumferential position of the platters and their planar orientation (i.e., A-side or B-side). For example, when the disk is mounted on a tool spindle and rotated, an optical detector detects the pattern of the shadows and feeds the data to a computer system. The rotational position of the spindle also is relayed to the computer for coordinating the processing of the rotating disk.
    Type: Application
    Filed: February 26, 2001
    Publication date: August 29, 2002
    Applicant: International Business Machines Corporation
    Inventors: Bradley Frederick Baumgartner, Andrew John Buhler, Erich Chuh, Hang Fai Ngo, Alma Lujan Ortega-Avery, Bob C. Robinson, Song How Wong-Jessel, Elmer Tyree York