Patents by Inventor Mari Ohfuti

Mari Ohfuti 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 semiconductor device using a SiGeC random mixed crystal
    Patent number: 6678296
    Abstract: An optical semiconductor device is constructed on a Si substrate and includes an active layer of a SiGeC mixed crystal in which Si, Ge and C atoms are distributed at random.
    Type: Grant
    Filed: September 19, 2000
    Date of Patent: January 13, 2004
    Assignee: Fujitsu Limited
    Inventor: Mari Ohfuti