Patents by Inventor Koushi Tamamura

Koushi Tamamura 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
    Patent number: 5151912
    Abstract: A semiconductor laser comprises a semiconductor substrate having first and second surfaces opposing to each other, first and second cladding layers formed on the first surface of the substrate, an active layer of a superlattice structure sandwiched between the first and second cladding layers, a capping layer formed on the second cladding layer, a first electrode provided on the capping layer, and a second electrode connected to the second surface of the substrate.
    Type: Grant
    Filed: October 29, 1991
    Date of Patent: September 29, 1992
    Assignee: Sony Corporation
    Inventors: Koushi Tamamura, Hiroyuki Iwamoto