Patents by Inventor Sirou Sirai

Sirou Sirai 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).

  • Pattern comparison ultrasonic surveillance system with noise suppression
    Patent number: 4499564
    Abstract: An ultrasonic surveillance system which emits pulse-like ultrasonic waves to an area under surveillance, which statistically compares a reflected-wave pattern established by receiving ultrasonic waves reflected from the under surveillance with a predetermined reference pattern, and which produces an alarm signal when these two patterns are not in agreement. According to this system, the alarm signal is prevented from being erroneously produced by ultrasonic noises.
    Type: Grant
    Filed: January 7, 1982
    Date of Patent: February 12, 1985
    Assignee: Secom Co., Ltd.
    Inventor: Sirou Sirai