Patents by Inventor Shuji Yoda

Shuji Yoda 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).

  • Heat sensitive recording material
    Patent number: 5212145
    Abstract: A heat sensitive recording material having a recording layer formed on a substrate and containing a colorless or light-colored basic dye and a color acceptor, the heat sensitive recording material being characterized in that at least one ethyleneimine derivative of the following formula (1) is contained in the recording layer as a preservability improving agent for record images ##STR1## wherein R.sub.1 is direct bond, --O--, --S--, --SO.sub.2 -- or C.sub.1 .about.C.sub.6 alkylene, R.sub.2 and R.sub.3 are each C.sub.1 .about.C.sub.4 alkyl, C.sub.1 .about.C.sub.4 alkoxyl or halogen atom, m and n are each zero or an integer of 1 to 4.
    Type: Grant
    Filed: July 23, 1992
    Date of Patent: May 18, 1993
    Assignee: Kanzaki Paper Manufacturing Co., Ltd.
    Inventors: Tetsuo Tsuchida, Yasuji Koga, Haruo Omura, Yoshihiro Shimizu, Shuji Yoda