Patents by Inventor Narimasa Takahashi

Narimasa Takahashi 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).

  • Sensor device, and disaster prevention system and electronic equipment each having sensor device incorporated therein
    Patent number: 5830412
    Abstract: A sensor device of the present invention is capable of surely detecting occurrence of a fire and a type of the fire. The sensor device includes a detection element made of an organic semiconductor element or an inorganic semiconductor element which is varied in characteristic value (i.e., resistance) thereof by both gas produced in a flaming-type fire and a smouldering-type fire and of which a variation in resistance by gas produced in a flaming-type fire is different in polarity from that by gas produced in a smouldering-type fire. A resistance of the detection element is extracted by a resistance extractor and then fed to a resistance decrease discriminator and a resistance increase discriminator, wherein a decrease or increase in resistance of the element is discriminated. An information output circuit outputs a predetermined signal depending on discrimination results provided by the discriminators, to thereby detect occurrence of a fire and/or a type of the fire.
    Type: Grant
    Filed: August 16, 1996
    Date of Patent: November 3, 1998
    Assignee: Nittan Company Limited
    Inventors: Tetsuo Kimura, Seiichi Tanaka, Narimasa Takahashi, Ryukichi Hashimoto