Patents by Inventor Ichiyo Maruyama

Ichiyo Maruyama 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).

  • System for detecting an alarm
    Patent number: 4536751
    Abstract: A system for detecting an alarm for emergency situations of a door or a window of a building or house in a predetermined guard area, comprising: an alarm circuit, including a plurality of alarm switch units for detecting emergencies and a resistor and a capacitor connected between first contacts and second contacts of the alarm switch units; and an alarm device, including a detecting circuit for detecting voltage changes of a predetermined measuring point, a pulse oscillator for generating a pulsating voltage, and a transistor for repeatedly turning on and off the current in response to the pulsating voltage applied from the pulse oscillator.
    Type: Grant
    Filed: June 23, 1983
    Date of Patent: August 20, 1985
    Assignee: Secom Co., Ltd.
    Inventors: Mineo Shigemitsu, Ichiyo Maruyama, Shigeru Niimura