Patents by Inventor Tomoko Ohtsuki

Tomoko Ohtsuki 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).

  • Magneto-optical recording medium having two RE-TM layers with the same Curie temperature
    Patent number: 5325343
    Abstract: The medium consists of two exchange-coupled RE-TM amorphous layers (a memory layer and a reference layer) whose Curie temperatures are almost the same and only one of which is RE-rich without a compensation temperature, the two layers being laminated directly or indirectly with an intermediate layer that allows exchange-coupling to be interposed. Before recording is carried out, the reference layer is magnetized in one direction. Pulses of energy are emitted from the memory layer side so that the temperature of the reference layer remains below its Curie temperature when one of the bit data is recorded but reaches its Curie temperature when the other of the bit data is recorded.
    Type: Grant
    Filed: November 3, 1992
    Date of Patent: June 28, 1994
    Assignee: International Business Machines Corporation
    Inventor: Tomoko Ohtsuki
  • Method , apparatus, and medium for magneto-optical recording
    Patent number: 5224080
    Abstract: The medium consists of two exchange-coupled RE-TM amorphous layers (a memory layer and a reference layer) whose Curie temperatures are almost the same and only one of which is RE-rich without a compensation temperature, the two layers being laminated directly or indirectly with an intermediate layer that allows exchange-coupling to be interposed. Before recording is carried out, the reference layer is magnetized in one direction. Pulses of energy are emitted from the memory layer side so that the temperature of the reference layer remains below its Curie temperature when one of the bit data is recorded but reaches its Curie temperature when the other of the bit data is recorded.
    Type: Grant
    Filed: February 18, 1992
    Date of Patent: June 29, 1993
    Assignee: International Business Machines Corporation
    Inventor: Tomoko Ohtsuki