Patents by Inventor Kyouji Muraoka

Kyouji Muraoka 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).

  • Diaphragm and method for producing same
    Patent number: 5180785
    Abstract: A diaphragm formed of a material for molding mainly composed of a uniform mixture of an ultra-high molecular weight polyolefin with a high melting viscosity and a polyolefin with a lower melting viscosity, wherein the ultra-high molecular weight polyolefin is extensively oriented by the lubricating action of polyolefin having the lower melting viscosity and the method for producing the diaphragm. The diaphragm superior in specific modulus of elasticity and internal losses may be produced by producing the polyolefin composition by multi-stage polymerization and injection molding the composition for radially orienting the molecular chains of the ultra-high molecular weight polyolefin.
    Type: Grant
    Filed: October 23, 1990
    Date of Patent: January 19, 1993
    Assignee: Sony Corporation
    Inventors: Masaru Uryu, Kunihiko Tokura, Kyouji Muraoka