Patents by Inventor Tomoyoshi Yamamoto

Tomoyoshi Yamamoto 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).

  • Catalyst for polyester production and process for producing polyester with the same
    Patent number: 6593447
    Abstract: A polyester having a good color tone, an excellent forming property and a high resistance to cohesion of foreign substance around a melt-spinning orifice when the polyester is melt-spun, is produced by polymerizing an aromatic difunctional carboxylic acid—alkyleneglycol ester and/or oligomer thereof in the presence of a catalyst including a reaction product of (A) a Ti compound component including a Ti compound (1) of formula (I) or a Ti compound (2) produced by reacting the Ti compound (1) with an aromatic difunctional carboxylic acid of the formula (III) or anhydride thereof, with (B) a P compound component selected from P compound (3) of the formula (III). [R1=C2-C10alkyl group; p=1-3, n=2-4, R2=substituted or unsubstituted C6-C20aryl or C1-C20 alkyl group, m=1 or 2, q=0 or 1, and m+q=1 or 2].
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: July 15, 2003
    Assignee: Teijin Limited
    Inventor: Tomoyoshi Yamamoto