Patents by Inventor Kazuhide Ohkawara

Kazuhide Ohkawara 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 isolator and method for fabricating the same
    Patent number: 5305137
    Abstract: A polarizer, a Faraday rotator and an analyzer are fixed by fused glass applied on an outer periphery of the polarizer to be contacted with the Faraday rotator and on an outer periphery of the analyzer to be contacted with the Faraday rotator. No adhesive exists between contact planes of the polarizer and the Faraday rotator and those of the Faraday rotator and the analyzer.
    Type: Grant
    Filed: May 11, 1992
    Date of Patent: April 19, 1994
    Assignee: Nec Corporation
    Inventor: Kazuhide Ohkawara