Patents by Inventor Makoto Tadeka

Makoto Tadeka 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).

  • Calcium carboxylate phenol derivative
    Patent number: 4694102
    Abstract: A phenol derivative represented by the formula ##STR1## wherein R.sup.1 is a secondary or tertiary hydrocarbon residue of having 3 to 8 carbon atoms, R.sup.2 is a hydrocarbon residue having 1 to 12 carbon atoms, X is ##STR2## wherein R.sup.3, R.sup.4 and R.sup.5 each is an alkylene group having 1 to 4 carbon atoms, Z is an n-valent group and n is an integer of 1 to 8.This compound is effective to prevent the oxidation of organic materials.
    Type: Grant
    Filed: May 23, 1986
    Date of Patent: September 15, 1987
    Assignee: Mitsubishi Yuka Fine Chemicals Co., Ltd.
    Inventors: Akiyoshi Oonishi, Kenji Tanaka, Makoto Tadeka, Kazuhiko Konno, Masaki Saito
  • Anti-oxidant phenol derivatives
    Patent number: 4633008
    Abstract: A phenol derivative represented by the formula ##STR1## wherein R.sup.1 is a secondary or tertiary hydrocarbon residue of having 3 to 8 carbon atoms, R.sup.2 is a hydrocarbon residue having 1 to 12 carbon atoms, X is ##STR2## wherein R.sup.3, R.sup.4 and R.sup.5 each is an alkylene group having 1 to 4 carbon atoms, Z is an n-valent group and n is an integer of 1 to 8.This compound is effective to prevent the oxidation of organic materials.
    Type: Grant
    Filed: February 29, 1984
    Date of Patent: December 30, 1986
    Assignee: Mitsubishi Yuka Fine Chemicals Co., Ltd.
    Inventors: Akiyoshi Oonishi, Kenji Tanaka, Makoto Tadeka, Kazuhiko Konno, Masaki Saito