Patents by Inventor Jacobus Petrus Heemskerk

Jacobus Petrus Heemskerk 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).

  • Optical recording medium and playback method for the same
    Publication number: 20050169158
    Abstract: An optical disc or other optical recording medium enables reading barcode-shaped-BCA marks in a burst cutting area (BCA) with tracking on while making tampering with the BCA marks difficult. The optical disc 100 has a first area 102 containing tracks at a first track pitch d2, and a second area 101 containing tracks at a second track pitch d1. The barcode-shaped marks 104 are recorded in the second area, and the second track pitch is wider than the first track pitch.
    Type: Application
    Filed: February 10, 2003
    Publication date: August 4, 2005
    Inventors: Shinya Abe, Shin-ichi Tanaka, Hiroshi Ogawa, Jacobus Petrus Heemskerk, Tamotsu Yamagami, Cornelis Schep