Patents by Inventor Toshiya Yoshi-i

Toshiya Yoshi-i 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).

  • Process for the production of a shaped article of a heat resistant polymer
    Patent number: 3961009
    Abstract: A process is provided for manufacturing heat resistant polymeric film. A concentrated polymer composition containing solvent is provided, which composition is a solid at room temperature. The composition comprises (a) a polymer having in the repeating units thereof a member selected from the group consisting of precursor units which on heat curing form heterocyclic rings, and a mixture of said precursor units and heterocyclic rings formed from said precursor units and (b) 25-130% by weight of an organic solvent for said polymer, the composition being a solid at room temperature.According to the process, the solid composition is heated to a temperature above room temperature and is extruded into film at this high temperature to form film at a temperature above room temperature and below the curing temperature of the polymer.
    Type: Grant
    Filed: August 1, 1973
    Date of Patent: June 1, 1976
    Assignee: Toray Industries, Inc.
    Inventors: Naoya Yoda, Toshiya Yoshi-i, Saburo Fujita, Hiroshi Mochizuki, Hirosuke Yumoto, Masaru Kurihara, Takashi Kubota, Noriaki Dokoshi, Chiaki Tanaka