Patents by Inventor Masashi Harakawa

Masashi Harakawa 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 producing inorganic fiber
    Patent number: 4961889
    Abstract: A process for producing an inorganic fiber superior in stretchability, which comprises; heating either a solution of a polymetalloxane in an organic solvent, the polymetalloxane content in the solution being at least 85% by weight and the viscosity of the solution at 25.degree. C. being at least 5000 poises, or a solid state polymetalloxane to prepare a spinning liquid having a viscosity of 1 to 3000 poises; spinning the spinning liquid to form a precursor fiber; and baking the precursor fiber.
    Type: Grant
    Filed: July 28, 1989
    Date of Patent: October 9, 1990
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Hidekimi Kadokura, Masashi Harakawa, Nagatoshi Nogami