Patents by Inventor Athumi Kukidome

Athumi Kukidome 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 the production of bishenol A
    Patent number: 5382711
    Abstract: High quality bisphenol A is produced from a neutral crystalline adduct of bisphenol A and phenol by fusing the adduct in an atmosphere having a maximum oxygen content of 0.005 % by volume, followed by evaporation of liberated phenol. The crystalline adduct may be mixed with an aliphatic carboxylic acid before the fusion to reduce the coloring of the product. When an acidic crystalline adduct is used, the use of a strong alkali salt of an aliphatic carboxylic acid is suitably used. Interior surfaces of the apparatuses for carrying out the fusion and evaporation are desirably washed with an organic solvent to remove oxygen therefrom. The evaporation of phenol is suitably performed by two stage steam stripping wherein a used stripping gas obtained in the second stage is employed as a stripping gas in the first stage while steam is used as the stripping gas in the second stage.
    Type: Grant
    Filed: April 18, 1994
    Date of Patent: January 17, 1995
    Assignee: Chiyoda Corporation
    Inventors: Sachio Asaoka, Tetsuo Maejima, Kouji Sakashita, Noriyuki Yoneda, Makoto Yasui, Nobuhiro Onda, Tsuneo Watanabe, Nobuo Moriya, Akio Shindo, Hiroaki Nishijima, Athumi Kukidome, Ryuichi Inaba, Takashi Imazeki, Kaoru Shimogawara
  • Process for the production of bisphenol A
    Patent number: 5382712
    Abstract: High quality bisphenol A is produced from a neutral crystalline adduct of bisphenol A and phenol by fusing the adduct in an atmosphere having a maximum oxygen content of 0.005% by volume, followed by evaporation of liberated phenol. The crystalline adduct may be mixed with an aliphatic carboxylic acid before the fusion to reduce the coloring of the product. When an acidic crystalline adduct is used, the use of a strong alkali salt of an aliphatic carboxylic acid is suitably used. Interior surfaces of the apparatuses for carrying out the fusion and evaporation are desirably washed with an organic solvent to remove oxygen therefrom. The evaporation of phenol is suitably performed by two stage steam stripping wherein a used stripping gas obtained in the second stage is employed as a stripping gas in the first stage while steam is used as the stripping gas in the second stage.
    Type: Grant
    Filed: April 18, 1994
    Date of Patent: January 17, 1995
    Assignee: Chiyoda Corporation
    Inventors: Sachio Asaoka, Tetsuo Maejima, Kouji Sakashita, Noriyuki Yoneda, Makoto Yasui, Nobuhiro Onda, Tsuneo Watanabe, Nobuo Moriya, Akio Shindo, Hiroaki Nishijima, Athumi Kukidome, Ryuichi Inaba, Takashi Imazeki, Kaoru Shimogawara
  • Process for the production of bisphenol A.
    Patent number: 5324867
    Abstract: High quality bisphenol A is produced from a neutral crystalline adduct of bisphenol A and phenol by fusing the adduct in an atmosphere having a maximum oxygen content of 0.005% by volume, followed by evaporation of liberated phenol. The crystalline adduct may be mixed with an aliphatic carboxylic acid before the fusion to reduce the coloring of the product. When an acidic crystalline adduct is used, the use of a strong alkali salt of an aliphatic carboxylic acid is suitably used. Interior surfaces of the apparatuses for carrying out the fusion and evaporation are desirably washed with an organic solvent to remove oxygen therefrom. The evaporation of phenol is suitably performed by two stage steam stripping wherein a used stripping gas obtained in the second stage is employed as a stripping gas in the first stage while steam is used as the stripping gas in the second stage.
    Type: Grant
    Filed: July 13, 1992
    Date of Patent: June 28, 1994
    Assignee: Chiyoda Corporation
    Inventors: Sachio Asaoka, Tetsuo Maejima, Kouji Sakashita, Noriyuki Yoneda, Makoto Yasui, Nobuhiro Onda, Tsuneo Watanabe, Nobuo Moriya, Akio Shindo, Hiroaki Nishijima, Athumi Kukidome, Ryuichi Inaba, Takashi Imazeki, Kaoru Shimogawara