Patents Examined by Le H. Thi
  • Magnetic medium comprising a substrate having pits and grooves of specific shapes and depths
    Patent number: 5350618
    Abstract: A magnetic medium comprising a substrate formed with a stepped pit and a magnetic substance buried in the stepped pit. A method of manufacturing a magnetic medium comprising the steps of forming a first groove in a substrate by photoetching, forming a second groove in the first groove or in a portion adjacent to the first groove by the photoetching, the second groove being different in depth from the first groove, and burying magnetic substances into the first and second grooves.
    Type: Grant
    Filed: February 26, 1992
    Date of Patent: September 27, 1994
    Assignee: Teijin Seiki Co., Ltd.
    Inventors: Masayuki Togawa, Kiyoshi Toyama