Patents by Inventor Hirohito Nagaiwa

Hirohito Nagaiwa 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).

  • Method for producing polyesters
    Patent number: 5703179
    Abstract: Method for producing polyesters by measuring the content of at least one of water, glycol and its ester-forming derivative in the distillate to be recycled, determining the amounts of the raw materials to be fed to the intended reaction device, on the basis of the data thus measured, and feeding stabilized amounts of recycle to the reaction device.
    Type: Grant
    Filed: August 8, 1996
    Date of Patent: December 30, 1997
    Assignee: Toray Industries, Inc.
    Inventors: Ryosuke Asakura, Hirohito Nagaiwa, Masashige Murakami