Patents by Inventor Katsuhisa Tada

Katsuhisa Tada 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).

  • Semiconductor laser device
    Patent number: 5020065
    Abstract: A semiconductor laser device comprise a semiconductor laser light emitting element, and a cap that covers and hermetically seals the laser light emitting element in a package. Laser light emitted from the element goes out through a hole formed in the top wall of the cap. A reflected light blocking element is disposed in the hole in the top wall of the cap. The reflected light blocking element includes a twisted-nematic liquid crystal cell and a pair of polarizers between which the twisted-nematic liquid crystal cell is disposed.
    Type: Grant
    Filed: January 8, 1990
    Date of Patent: May 28, 1991
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Katsuhisa Tada
  • Optical semiconductor device
    Patent number: 4961616
    Abstract: An optical semiconductor device includes an optical semiconductor element which may be a light emitting element or a light receiving element, enclosed within a lensed-cap including a cap with a lens attached to it. A thread is formed on the outer surface of the lensed-cap so that the lensed-cap can be threaded into a housing having a corresponding thread on its inner wall. The optical semiconductor device is threaded into the housing to form a module.
    Type: Grant
    Filed: September 21, 1989
    Date of Patent: October 9, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Katsuhisa Tada