Patents by Inventor Yoshikazu Tokuoka

Yoshikazu Tokuoka 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).

  • Halogen scavengers
    Patent number: 5759441
    Abstract: A halogen scavenger contains as an effective ingredient an aromatic compound which has a resonance-effect-relying electron donating group as a substituent. The aromatic compound is constituted, for example, by an aromatic ring such as a substituted or unsubstituted benzene, naphthalene, anthracene and pyridine ring, and at least one group (a resonance-effect-relying electron donating group) which contains a lone-pair-containing hetero atom, such as an oxygen, sulfur or nitrogen atom, adjacent to the aromatic ring.
    Type: Grant
    Filed: January 22, 1996
    Date of Patent: June 2, 1998
    Assignee: S. T. Chemical Co., Ltd.
    Inventors: Yoshikazu Tokuoka, Haruo Shibatani
  • Halogen scavengers
    Patent number: 5503768
    Abstract: A halogen scavenger contains as an effective ingredient an aromatic compound which has a resonance-effect-relying electron donating group as a substituent. The aromatic compound is constituted, for example, by an aromatic ring such as a substituted or unsubstituted benzene, naphthalene, anthracene and pyridine ring, and at least one group (a resonance-effect-relying electron donating group) which contains a lone-pair-containing hetero atom, such as an oxygen, sulfur or nitrogen atom, adjacent to the aromatic ring.
    Type: Grant
    Filed: May 31, 1994
    Date of Patent: April 2, 1996
    Assignee: S.T. Chemical Co., Ltd.
    Inventors: Yoshikazu Tokuoka, Haruo Shibatani