Patents by Inventor Hiroo Yamashita

Hiroo Yamashita 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 FOR PRODUCING POLYIMIDE FILM
    Publication number: 20170137571
    Abstract: A method for producing a polyimide film includes: (i) applying a polyamic acid solution composition, which includes at least one of the following solvents: N-methylformamide, N,N-dimethylpropionamide, N,N-dimethylisobutylamide and tetramethylurea, and a polyamic acid, to a substrate; and then (ii) imidizing the polyamic acid by subjecting the composition to heat treatment, to obtain the polyimide film.
    Type: Application
    Filed: June 4, 2015
    Publication date: May 18, 2017
    Inventors: Tomonori NAKAYAMA, Shohei INOUE, Takeshige NAKAYAMA, Hiroo YAMASHITA, Naoki KITAYAMA
  • Process for producing polyimide siloxane solution composition, and polyimide siloxane solution composition
    Patent number: 9012537
    Abstract: There may be provided a process for producing a polyimide siloxane solution composition having a further improved long-term viscosity stability; and a polyimide siloxane solution composition. In the process for producing the polyimide siloxane solution composition by polymerizing/imidizing a tetracarboxylic acid component and a diamine component consisting of (a) a diaminopolysiloxane, (b) a diamine having a polar group and (c) a diamine other than (a) and (b) in a solvent, the tetracarboxylic acid component and the diamine component excluding (b) the diamine having a polar group are polymerized/imidized to provide a reaction mixture solution, and then (b) the diamine having a polar group is added to the reaction mixture solution last, and the mixture is polymerized/imidized.
    Type: Grant
    Filed: August 17, 2010
    Date of Patent: April 21, 2015
    Assignee: Ube Industries, Ltd.
    Inventors: Susumu Takasaki, Hiroo Yamashita, Seiichirou Takabayashi, Tomoko Hayashida, Mitsuo Yamanaka, Takafumi Hirakawa
  • PROCESS FOR PRODUCING POLYIMIDE SILOXANE SOLUTION COMPOSITION, AND POLYIMIDE SILOXANE SOLUTION COMPOSITION
    Publication number: 20120157574
    Abstract: There may be provided a process for producing a polyimide siloxane solution composition having a further improved long-term viscosity stability; and a polyimide siloxane solution composition. In the process for producing the polyimide siloxane solution composition by polymerizing/imidizing a tetracarboxylic acid component and a diamine component consisting of (a) a diaminopolysiloxane, (b) a diamine having a polar group and (c) a diamine other than (a) and (b) in a solvent, the tetracarboxylic acid component and the diamine component excluding (b) the diamine having a polar group are polymerized/imidized to provide a reaction mixture solution, and then (b) the diamine having a polar group is added to the reaction mixture solution last, and the mixture is polymerized/imidized.
    Type: Application
    Filed: August 17, 2010
    Publication date: June 21, 2012
    Applicant: UBE INDUSTRIES, LTD.
    Inventors: Susumu Takasaki, Hiroo Yamashita, Selichirou Takabayashi, Tomoko Hayashida, Mitsuo Yamanaka, Takafumi Hirakawa