Patents by Inventor Tomiji Nirasawa

Tomiji Nirasawa 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).

  • Marine radar transmission and reception system
    Patent number: 4008472
    Abstract: A marine radar transmission and reception system in which first and second transmission pulse radar waves are emitted as first and second pulse radar waves from first and second radar antennae or a common radar antenna; reflected waves of the first and second emitted pulse radar waves are received as first and second received pulse radar waves by the first and second radar antennae or the common radar antenna; the modes of the first and second transmission pulse radar waves are selected in cooperation with those of the first and second radar antennae or that of the common radar antenna so that the first and second received pulse radar waves may be received by the first and second radar antennae or the common radar antenna independently of each other; a quotient or difference output corresponding to the quotient or difference of the first and second received pulse radar waves or the first and second received outputs based thereon is obtained; and sea clutter eliminated received pulse radar waves or outputs bas
    Type: Grant
    Filed: February 21, 1975
    Date of Patent: February 15, 1977
    Assignee: Kabushiki Kaisha Tokyo Keikio
    Inventors: Tomiji Nirasawa, Hiroshi Ota
  • Marine radar transmission and reception system
    Patent number: 3955196
    Abstract: A marine radar transmission and reception system in which first and second transmission pulse radar waves are emitted as first and second pulse radar waves from first and second radar antennae or a common radar antenna; reflected waves of the first and second emitted pulse radar waves are received as first and second received pulse radar waves by the first and second radar antennae or the common radar antenna; the modes of the first and second transmission pulse radar waves are selected in cooperation with those of the first and second radar antennae or that of the common radar antenna so that the first and second received pulse radar waves may be received by the first and second radar antennae or the common radar antenna independently of each other; a quotient or difference output corresponding to the quotient or difference of the first and second received pulse radar waves or the first and second received outputs based thereon is obtained; and sea clutter eliminated received pulse radar waves or outputs bas
    Type: Grant
    Filed: February 21, 1975
    Date of Patent: May 4, 1976
    Assignee: Kabushikikaisha Tokyo Keiki
    Inventors: Tomiji Nirasawa, Hiroshi Ota
  • Marine radar transmission and reception system
    Patent number: 3952305
    Abstract: A marine radar transmission and reception system in which first and second transmission pulse radar waves are emitted as first and second pulse radar waves from first and second radar antennae or a common radar antenna; reflected waves of the first and second emitted pulse radar waves are received as first and second received pulse radar waves by the first and second radar antennae or the common radar antenna; the modes of the first and second transmission pulse radar waves are selected in cooperation with those of the first and second radar antennae or that of the common radar antenna so that the first and second received pulse radar waves may be received by the first and second radar antennae or the common radar antenna independently of each other; a quotient or difference output corresponding to the quotient or difference of the first and second received pulse radar waves or the first and second received outputs based thereon is obtained; and sea clutter eliminated received pulse radar waves or outputs bas
    Type: Grant
    Filed: February 21, 1975
    Date of Patent: April 20, 1976
    Assignee: Kabushiki Kaisha Tokyo Keiki
    Inventors: Tomiji Nirasawa, Hiroshi Ota