Patents by Inventor Mitsuyoshi Ookubo

Mitsuyoshi Ookubo 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).

  • Method for manufacturing semiconductor laser device having current blocking layers
    Patent number: 5543355
    Abstract: In a method for manufacturing a semiconductor laser device, striped grooves are formed in a compound semiconductor substrate (or crystal element) on both sides of a light emission area, Then, the compound semiconductor substrate on both outer sides of the striped grooves is etched, so that the compound semiconductor substrate is lower than at both outer sides of the striped grooves than at the light emission area. Then, Current blocking layers are buried in the compound semiconductor substrate except for the light emission area.
    Type: Grant
    Filed: April 17, 1995
    Date of Patent: August 6, 1996
    Assignee: NEC Corporation
    Inventor: Mitsuyoshi Ookubo