Patents by Inventor Hiroki Naitou

Hiroki Naitou 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 including a gallium-aluminum arsenic compound
    Patent number: 5297158
    Abstract: In a semiconductor laser device, a Ga.sub.1-y Al.sub.y As cladding layer of a conduction type is provided on at least one principal plane of an active layer, while a Ga.sub.1-Z Al.sub.Z As current blocking layer of the other conduction type is provided on the cladding layer and has a stripe-like window. The AlAs mode fractions Y and Z has a relation, Z>Y. The semiconductor laser device has low noises and a low operating current value.
    Type: Grant
    Filed: April 21, 1992
    Date of Patent: March 22, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroki Naitou, Masahiro Kume, Issei Ota, Hirokazu Shimizu