Patents by Inventor Mari Aoyama

Mari Aoyama 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).

  • Method of forming a porous polyolefin film
    Patent number: 4921653
    Abstract: A gas-permeable porous film which is prepared by stretching a film made from a mixture containing a polyolefin resin and an inorganic filler at least uniaxially and possesses a rugged pattern on its surface. One process for producing the film comprises forming the aforesaid mixture into a film, providing on the surface of the film a rugged pattern, stretching the resulting film at least uniaxially, and forming on the stretched film thus-formed a rugged pattern by means of a heated emboss roll and simultaneously allowing the stretched film to contract.
    Type: Grant
    Filed: November 2, 1988
    Date of Patent: May 1, 1990
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Mari Aoyama, Michiyasu Ito, Syoichi Tsuji, Toshiyuki Ishii, Tomohide Tanaka
  • Preparation of gas permeable porous film
    Patent number: 4814124
    Abstract: A gas permeable porous film which is prepared by stretching a film made from a mixture containing a polyolefin resin and an inorganic filler at least uniaxially and possesses a rugged pattern on its surface. One process for producing the film comprises forming the aforesaid mixture into a film, providing on the surface of the film a rugged pattern, stretching the resulting film at least uniaxially, and forming on the stretched film thus-formed a rugged pattern by means of a heated emboss roll and simultaneously allowing the stretched film to contract.
    Type: Grant
    Filed: January 20, 1987
    Date of Patent: March 21, 1989
    Assignee: Mitsui Toatsu Chemicals Inc.
    Inventors: Mari Aoyama, Michiyasu Ito, Syoichi Tsuji, Toshiyuki Ishii, Tomohide Tanaka