Patents by Inventor Toshihiro Tanuma

Toshihiro Tanuma 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).

  • Recording sheet and record
    Patent number: 5670249
    Abstract: A recording sheet which comprises a substrate and a porous ink-receiving layer containing at least one compound selected from the group consisting of dithiocarbamates, thiurams, thiocyanate esters, thiocyanates and hindered amines, formed on the substrate.
    Type: Grant
    Filed: October 10, 1996
    Date of Patent: September 23, 1997
    Assignee: Asahi Glass Company Ltd.
    Inventor: Toshihiro Tanuma
  • Process for producing a hydrogen-containing 2,2-difluoropropane
    Patent number: 5545777
    Abstract: A process for producing a hydrogen-containing 2,2-difluoropropane of the following formula (2), which comprises subjecting a 2,2-difluoropropane of the following formula (1) to hydrogen reduction:C.sub.3 H.sub.a Cl.sub.b F.sub.c (1)C.sub.3 H.sub.a+x Cl.sub.b-y F.sub.c-z (2)wherein a, b, c, x, y and z are integers satisfying the following conditions:a.gtoreq.0, b.gtoreq.1, c.gtoreq.2, x.gtoreq.1, y.gtoreq.0, z.gtoreq.0, a+b+c=8, x=y+z b-y.gtoreq.0, and c-z.gtoreq.2.
    Type: Grant
    Filed: July 11, 1994
    Date of Patent: August 13, 1996
    Assignee: Asahi Glass Company Ltd.
    Inventors: Shinsuke Morikawa, Shunichi Samejima, Masaru Yoshitake, Hidekazu Okamoto, Keiichi Ohnishi, Toshihiro Tanuma
  • Recording sheet and record
    Patent number: 5445868
    Abstract: A recording sheet comprising a substrate and a colorant absorbing layer made of a porous inorganic oxide, formed on the substrate, wherein said colorant absorbing layer contains an organic acid with the first acid dissociation exponent of at most 5, which has an aromatic nucleus or at least two carboxyl groups.
    Type: Grant
    Filed: March 10, 1994
    Date of Patent: August 29, 1995
    Assignee: Asahi Glass Company Ltd.
    Inventors: Masako Harasawa, Katsutoshi Misuda, Toshiya Matsubara, Toshihiro Tanuma
  • Method for producing dichloropentafluoropropanes
    Patent number: 5434321
    Abstract: A method for producing a dichloropentafluoropropane, which comprises reacting dichlorofluoromethane (R21) with tetrafluoroethylene (4F) in the presence of a Lewis acid catalyst for addition reaction to obtain dichloropentafluoropropane, wherein a halide containing at least one element selected from the group consisting of Sb, Nb, Ta, B, Ga, In, Zr, Hf and Ti, or AlBr.sub.3, or AlI.sub.3, is used as the Lewis acid.
    Type: Grant
    Filed: April 18, 1994
    Date of Patent: July 18, 1995
    Assignee: Asahi Glass Company Ltd.
    Inventors: Keiichi Ohnishi, Hidekazu Okamoto, Toshihiro Tanuma, Koichi Yanase, Toru Kawasaki, Ryutaro Takei
  • Process for producing a 2,2-difluoropropane
    Patent number: 5264639
    Abstract: A process for producing a 2,2-difluoropropane of the following formula (2), which comprises fluorinating a chlorine-containing 2,2-halogenopropane of the following formula (1) by hydrogen fluoride or a fluorinating agent:C.sub.3 H.sub.a Cl.sub.b F.sub.c (1)C.sub.3 H.sub.a Cl.sub.b-x F.sub.c+x (2)wherein a, b, c and x are integers satisfying the following conditions:a.gtoreq.0, b.gtoreq.1, c.gtoreq.0, x.gtoreq.1, a+b+c=8.
    Type: Grant
    Filed: May 20, 1992
    Date of Patent: November 23, 1993
    Assignee: Asahi Glass Company Ltd.
    Inventors: Shinsuke Morikawa, Shunichi Samejima, Hidekazu Okamoto, Keiichi Ohnishi, Shin Tatematsu, Toshihiro Tanuma, Takashi Ohmori
  • Method for producing dichloropentafluoropropanes
    Patent number: 5227547
    Abstract: A method for producing a dichloropentafluoropropane, which comprises reacting dichlorofluoromethane (R21) with tetrafluoroethylene (4F) in the presence of a Lewis acid catalyst for addition reaction to obtain dichloropentafluoropropane, wherein a halide containing at least one element selected from the group consisting of Sb, Nb, Ta, B, Ga, In, Zr, Hf and Ti, or AlBr.sub.3, or AlI.sub.3, is used as the Lewis acid.
    Type: Grant
    Filed: July 20, 1992
    Date of Patent: July 13, 1993
    Assignee: Asahi Glass Company Ltd.
    Inventors: Keiichi Ohnishi, Hidekazu Okamoto, Toshihiro Tanuma, Koichi Yanase, Toru Kawasaki, Ryutaro Takei
  • Method for producing dichloropentafluoropropanes
    Patent number: 5220084
    Abstract: A method for producing a dichloropentafluoropropane, which comprises reacting dichlorofluoromethane (R21) with tetrafluoroethylene (4F) in the presence of a Lewis acid catalyst for addition reaction to obtain dichloropentafluoropropane, wherein a halide containing at least one element selected from the group consisting of Sb, Nb, Ta, B, Ga, In, Zr, Hf and Ti, or AlBr.sub.3, or AlI.sub.3, is used as the Lewis acid.
    Type: Grant
    Filed: July 20, 1992
    Date of Patent: June 15, 1993
    Assignee: Asahi Glass Company Ltd.
    Inventors: Keiichi Ohnishi, Hidekazu Okamoto, Toshihiro Tanuma, Koichi Yanase, Toru Kawasaki, Ryutaro Takei