Patents by Inventor Naomasa Hanano

Naomasa Hanano 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).

  • Signal transmission system having a star coupled repeater
    Patent number: 5210632
    Abstract: A signal transmission system comprising an apparatus which inhibits the repeating in the opposite direction during reception and transmission of frames and which monitors the number of frames which were outputted in one direction from a repeater and the number of frames which were returned from such direction, whereby a destruction and circulation of the frame are inhibited without reducing response speed of a signal.
    Type: Grant
    Filed: May 22, 1990
    Date of Patent: May 11, 1993
    Assignees: Hitachi, Ltd., Hitachi Cable Ltd., Hitachi Process Computer Engineering, Inc.
    Inventors: Toshiyuki Murakami, Sadao Mizokawa, Hisayuki Maruyama, Masato Satake, Masanori Kogawa, Naomasa Hanano
  • Optical communication system utilizing light emitting diode
    Patent number: 4207459
    Abstract: In an optical communication system, wherein light intensity modulation with no carrier is performed using a light emitting diode with linear relation of the drive signal current vs. optical output power over a range which changes with frequency of the drive signal, the input signal is modulated for relatively larger amplification of frequencies higher than a predetermined frequency, above the thermal response frequency of the light emitting diode, than for frequencies lower than the predetermined frequency.
    Type: Grant
    Filed: September 9, 1977
    Date of Patent: June 10, 1980
    Assignee: Fujitsu Limited
    Inventors: Hiroshi Nakamura, Naomasa Hanano, Kazuo Iguchi