Patents by Inventor Etsuo Ohtake

Etsuo Ohtake 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).

  • Process for producing a thin resin film
    Patent number: 4878973
    Abstract: A process for producing a thin film of unoriented cellulose ester held under uniform tension, the process including the steps of: casting a solution of cellulose ester in an organic solvent over a smooth glass plate and thereafter removing the solvent to form a thin film of a uniform thickness on the glass plate; permitting the thin film to separate from the glass plate by immersing the same into water; and recovering the thin film from the water and setting the wet film on a supporting mount, followed by drying the same.
    Type: Grant
    Filed: August 19, 1985
    Date of Patent: November 7, 1989
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Etsuo Ohtake, Kaoru Yamaki, Takayuki Kuroda
  • Porous spherical cellulose acetate particles
    Patent number: 4551389
    Abstract: Cellulose acetate is formed into porous, spherical particles, having an acetylation degree of 49 to 60%, a particle diameter of 0.05 to 10 mm, a sphericity of 0.7 or larger, a pore volume of 0.4 cc/g or larger and a collapsing strength of 9 kg or higher.
    Type: Grant
    Filed: January 23, 1985
    Date of Patent: November 5, 1985
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Etsuo Ohtake, Kazuhiro Yamazaki
  • Nitrocellulose composition and process for producing the same
    Patent number: 4460411
    Abstract: A nitrocellulose composition in the form of chips containing 50 to 80 wt % of nitrocellulose and less than 1 wt % of water is produced by adding to water-wetted nitrocellulose an organic solvent which dissolves nitrocellulose and polyurethane resin and is inert to isocyanate in an amount of 30 to 300 parts by weight based on 100 parts by weight of dry nitrocellulose, mixing, rolling or extrusion molding, drying at 30.degree. to 55.degree. C., and cutting. This composition is useful as nitrocellulose for magnetic tape binder.
    Type: Grant
    Filed: December 1, 1982
    Date of Patent: July 17, 1984
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Etsuo Ohtake, Akihiko Higuchi