Patents by Inventor Tamihiro Nakayama

Tamihiro Nakayama 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).

  • Casting films of poly(meta-phenylene isophthalamide) and its copolymers
    Patent number: 4070433
    Abstract: An aromatic polyamide film having a dielectric strength of at least about 150 kv/mm which is useful as an electric insulating material. This film is obtained by casting a solution comprising poly(m-phenylene isophthalamide) or a copolymer thereof and an amide type solvent, drying the cast product to form a film having a residual solvent content of not more than about 60% by weight, immersing the film in an aqueous medium kept at not more than about 20.degree. C, and stretching the resulting wet film containing at least about 5% by weight of the aqueous medium in at least one direction to at least about 1.4 times the original dimension.
    Type: Grant
    Filed: June 16, 1976
    Date of Patent: January 24, 1978
    Assignee: Unitika Ltd.
    Inventors: Akira Miyoshi, Masanori Masuda, Tamihiro Nakayama