Patents by Inventor Shozo Tsuji

Shozo Tsuji 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).

  • Thermally stabilized polyester-polyether block copolymer composition
    Patent number: 4013618
    Abstract: A polyester-polyether block copolymer composition being very stable even in the presence of heavy metals, which comprises a polyester-polyether block copolymer consisting of segments of polyester units and segments of polyether units; at least one compound containing the group of the following formula: ##STR1## wherein X is oxygen or sulfur, R.sub.1, R.sub.2 and R.sub.3 are each hydrogen or an organic residue, or R.sub.2 and R.sub.3 forms a Schiff's base with the adjacent nitrogen, and R.sub.4 and R.sub.5 are each hydrogen or an organic residue; at least one radical scavenger and/or at least one peroxide decomposer.
    Type: Grant
    Filed: December 31, 1974
    Date of Patent: March 22, 1977
    Assignee: Toyobo Co., Ltd.
    Inventors: Shozo Tsuji, Takahisa Minami, Misao Sumoto