Patents by Inventor Sinichi Akitaya

Sinichi Akitaya 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).

  • Polypropylene film and multilayered polypropylene film
    Patent number: 6511755
    Abstract: The present invention relates to a film using a polypropylene composition comprising crystalline polypropylene and a copolymer of propylene with &agr;-olefin in which a limiting viscosity of the said copolymer [&eegr;]RC is not more than 6.5 dl/g; the ratio of the limiting viscosity of the said polymer [&eegr;]RC to the limiting viscosity of the said crystalline polypropylene [&eegr;]PP is from 0.6 to 1.2; and the product i.e. ([&eegr;]RC/[&eegr;]PP)×(WPP/WRC), of the ratio of the limiting viscosity of the copolymer to the crystalline polypropylene with the ratio by weight of them is within a range of from 0.2 to 4.5 and also relates to a multi-layered film having at least one layer of the said film.
    Type: Grant
    Filed: February 12, 2001
    Date of Patent: January 28, 2003
    Assignee: Chisso Corporation
    Inventors: Yasuhiro Mochizuki, Yoshitaka Morimoto, Takanori Nakashima, Taketo Hirose, Takayuki Hattori, Sinichi Akitaya, Youichi Kugimiya