Patents by Inventor Yasumasa Dougakiuchi

Yasumasa Dougakiuchi 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).

  • Loop-type optical fiber transmission system having master and slave apparatus
    Patent number: 4941206
    Abstract: In a loop-type optical fiber transmission system composed of a master apparatus (50) and a plurality of slave apparatus (54), when an intensity of incident light (6B, 6C, 6E) to a first slave apparatus (55) is insufficient, the first slave apparatus (55) sends a status signal (CS.sub.b) informing malfunction in the light intensity to the master apparatus (50), the master apparatus upon receipt of the status signal from the first slave apparatus (55) sends a command signal to increase an output light intensity of a second slave apparatus (54) which is positioned at the upper stream of the first slave apparatus (55), and thus the intensity of the output light from the second slave apparatus (54) is increased.
    Type: Grant
    Filed: November 28, 1988
    Date of Patent: July 10, 1990
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tsutomu Sakurai, Yoshifumi Hara, Yasumasa Dougakiuchi