Patents by Inventor Hifumi Ota

Hifumi Ota 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).

  • Telephone apparatus with howling prevention function
    Patent number: 6339642
    Abstract: A telephone apparatus having a howling preventing function is connected to a communication partner via a telephone exchange and is constructed by a communication unit, including a microphone and a speaker, for communicating with the communication partner, and a preventing unit for preventing howling by the communication unit based on a mode of the communication unit and a signal according to the communication partner received from the telephone exchange.
    Type: Grant
    Filed: March 19, 1996
    Date of Patent: January 15, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hifumi Ota, Shigeru Hiroki