Patents by Inventor Nobuhisa Shinozaki

Nobuhisa Shinozaki 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).

  • Ringing circuit for use in portable telephone set
    Patent number: 5337356
    Abstract: A portable telephone set having a ringing circuit for producing different ringing tones depending upon the use mode of the portable telephone set, a portable mode or a mobile mode. The ringing circuit comprises a mode detecting circuit for detecting the use mode, an internal loudspeaker housed in a housing of the portable telephone set for producing a first ringing signal when the portable telephone set is in the portable mode, an external loudspeaker connected externally of the housing for producing a second ringing signal when it is in the mobile mode and a ringing tone generator for generating a first and a second ringing tones for driving the respective loudspeakers producing first and second ringings. The first and second ringing tones have frequency spectra compatible with frequency characteristics of these loudspeakers to produce the respective ringings efficiently.
    Type: Grant
    Filed: February 23, 1993
    Date of Patent: August 9, 1994
    Assignee: NEC Corporation
    Inventor: Nobuhisa Shinozaki
  • Ringing circuit for use in a telephone set for detecting a mobile mode or a portable mode of the telephone set
    Patent number: 5317622
    Abstract: A portable telephone set having a ringing circuit for producing different ringing tones depending upon the use mode of the portable telephone set, a portable mode or a mobile mode. The ringing circuit comprises a mode detecting circuit for detecting the use mode, an internal loudspeaker housed in a housing of the portable telephone set for producing a first ringing signal when the portable telephone set is in the portable mode, an external loud-speaker connected externally of the housing for producing a second ringing signal when it is in the mobile mode and a ringing tone generator for generating a first and a second ringing tones for driving the respective loud-speakers producing first and second ringings. The first and second ringing tones have frequency spectra compatible with frequency characteristics of these loudspeakers to produce the respective ringings efficiently.
    Type: Grant
    Filed: February 23, 1993
    Date of Patent: May 31, 1994
    Assignee: NEC Corporation
    Inventor: Nobuhisa Shinozaki
  • Ringing circuit for use in portable telephone set
    Patent number: 5303284
    Abstract: A portable telephone set having a ringing circuit for producing different ringing tones depending upon the use mode of the portable telephone set, a portable mode or a mobile mode. The ringing circuit comprises a mode detecting circuit for detecting the use mode, an internal loudspeaker housed in a housing of the portable telephone set for producing a first ringing signal when the portable telephone set is in the portable mode, an external loudspeaker connected externally of the housing for producing a second ringing signal when it is in the mobile mode and a ringing tone generator for generating a first and a second ringing tones for driving the respective loudspeakers producing first and second ringings. The first and second ringing tones have frequency spectra compatible with frequency characteristics of these loudspeakers to produce the respective ringings efficiently.
    Type: Grant
    Filed: January 31, 1991
    Date of Patent: April 12, 1994
    Assignee: NEC Corporation
    Inventor: Nobuhisa Shinozaki