Patents by Inventor Kazuhiko Matsuzawa

Kazuhiko Matsuzawa 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).

  • Intrusion detection and warning system
    Patent number: 6703932
    Abstract: A warning system comprises a piezo-electric ceramic capable of resonating with an ultrasonic wave having a frequency within a predetermined frequency band and thus outputting an electric signal, a resonator capable of detecting only a signal component having a specific frequency from the electric signal output from the piezo-electric ceramic. When the resonator has detected a signal component having a specific frequency, an alarm signal is continuously generated for a predetermined time set by a timer, so that a warning notice is produced by an alarm device in accordance with the alarm signal.
    Type: Grant
    Filed: March 7, 2002
    Date of Patent: March 9, 2004
    Assignee: Iwata Electric Co., Ltd.
    Inventor: Kazuhiko Matsuzawa
  • Warning system
    Publication number: 20030020609
    Abstract: A warning system comprises a piezo-electric ceramic capable of resonating with an ultrasonic wave having a frequency within a predetermined frequency band and thus outputting an electric signal, a resonator capable of detecting only a signal component having a specific frequency from the electric signal output from the piezoelectric ceramic. When the resonator has detected a signal component having a specific frequency, an alarm signal is continuously generated for a predetermined time set by a timer, so that a warning notice is produced by an alarm device in accordance with the alarm signal.
    Type: Application
    Filed: March 7, 2002
    Publication date: January 30, 2003
    Inventor: Kazuhiko Matsuzawa