Patents by Inventor Bruce Ha

Bruce Ha 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).

  • Hybrid optical disc construction
    Publication number: 20010005357
    Abstract: A hybrid optical recording disc having a substrate and a recording layer disposed over the substrate, the substrate having a read-only (ROM) area in which a groove is modulated by depressions in the substrate and a recordable area in which the groove from the read-only area extends into the substrate in the recordable area. The groove in the read-only area forming wobbling tracks having a depth greater than 170 nm and wherein the depth d2 of the depression in the groove in the read-only area is in a range greater than 170 nm and less than 350 nm.
    Type: Application
    Filed: December 18, 2000
    Publication date: June 28, 2001
    Applicant: Eastman Kodak Company
    Inventors: Bruce Ha, James A. Barnard, Thomas C. Burgo
  • Hybrid optical disc construction
    Patent number: 6212158
    Abstract: A hybrid optical recording disc having a substrate and a recording layer disposed over the substrate, the substrate having a read-only (ROM) area in which a groove is modulated by depressions in the substrate and a recordable area in which the groove from the read-only area extends into the substrate in the recordable area, the groove in the read-only area forming wobbling tracks having a depth greater than 170 nm.
    Type: Grant
    Filed: June 1, 1999
    Date of Patent: April 3, 2001
    Assignee: Eastman Kodak Company
    Inventors: Bruce Ha, James A. Barnard, Thomas C. Burgo