Patents by Inventor Manabu Shirasaka

Manabu Shirasaka 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).

  • Patent number: 5377257
    Abstract: A facsimile apparatus which carries out ringing of a telephone first for calling, and transmits a voice message informing of "absence" and "facsimile receivable" to a calling station when offhook is not detected during a predetermined period. The facsimile apparatus also transmits a called station identification signal CED after a silence interval of about 5 seconds. When the calling station onhooks a handset during the period of ringing of the telephone by judging that the called station is absent, a fee for a telephone call will not be charged. Furthermore, by setting the silence interval, the CED signal after the voice message is prevented from being heard by the calling station.
    Type: Grant
    Filed: November 6, 1992
    Date of Patent: December 27, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Manabu Shirasaka, Teiji Okamoto, Fumitaka Ito, Yasuyuki Kozima