Patents by Inventor Yakudo Tachibana

Yakudo Tachibana 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).

  • Patent number: 5945569
    Abstract: A catalyst for producing phenols consists essentially of;an iron oxide;a nickel oxide;at least one first oxide selected from the group consisting of a vanadium oxide and a molybdenum oxide; andat least one second oxide selected from the group consisting of an alkali metal oxide and an alkaline earth metal oxide.The catalyst is used to produce phenols from benzoic acid or an alkyl benzoic acid.
    Type: Grant
    Filed: May 16, 1996
    Date of Patent: August 31, 1999
    Assignee: NKK Corporation
    Inventors: Jun Miki, Minoru Asanuma, Takeshi Konishi, Yakudo Tachibana, Tsutomu Shikada, Aiko Watanabe
  • Patent number: 5268512
    Abstract: A catalyst for producing phenol consisting essentially of a nickel compound supported on a metal oxide carrier, or a catalyst for producing phenol consisting essentially of iron oxide and nickel oxide, and processes for producing phenol using either of the above catalyst. The catalysts of the invention exercise a high conversion of benzoic acid and a high selectivity to phenol, and phenol can be produced in a high yield, particularly in a high space time yield through the processes of the invention using the above catalysts. The above conversion, selectivity and space time yield can be improved by calcining the catalyst at 600.degree. to 900.degree. C.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: December 7, 1993
    Assignee: NKK Corporation
    Inventors: Jun Miki, Toshifumi Suzuki, Tsutomu Shikada, Kazuhiko Tate, Yakudo Tachibana
  • Patent number: 5139756
    Abstract: A process for decomposing ammonia recovered from coke oven gas through catalytic oxidation in the presence of oxygen gas, which comprises contacting a catalyst containing at least copper oxide or vanadium oxide in a fluidized state with the ammonia vapor. In the process of the invention, the reaction can be conducted at a low temperature of 400.degree. to 600.degree. C. and the generation of NO.sub.x is very small in quantity.
    Type: Grant
    Filed: January 21, 1992
    Date of Patent: August 18, 1992
    Assignee: NKK Corporation
    Inventors: Tsutomu Shikada, Minoru Asanuma, Yakudo Tachibana
  • Patent number: 5055612
    Abstract: A process for the preparation of naphthalene mono or polycarboxylic acids, such as 2,6-naphthalene dicarboxylic acid, is disclosed which includes oxidizing a naphthalene compound such as 2,6-diisopropylnaphthalene in a specific solvent with molecular oxygen in the presence of a catalyst containing a heavy metal compound and a bromine compound. The solvent is an aliphatic monocarboxylic acid and may further contain benzene and/or water. By controlling the ratio of the amount of catalyst metal to the feed rate of the raw material naphthalene compound, the yield of desired product can be controlled.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: October 8, 1991
    Assignees: NKK Corporation, Chiyoda Corporation
    Inventors: Yakudo Tachibana, Kazuhiko Tate, Masami Ono, Nobuhiro Takei, Jun Miki, Hiroaki Taniguchi, Yoshimi Shiroto, Misunori Shimura, Yoshio Fukui
  • Patent number: 4992622
    Abstract: A method of separating 2,6-diisopropylnaphthalene from a mixture containing 2,6-diisopropylnaphthalene and structural isomers thereof including the 2,7-isomer is disclosed, wherein the mixture is first subjected to a selective adsorption and desorption treatment using a zeolite absorbent capable of adsorbing the 2,7-isomer to obtain a first extract containing the sorbed 2,7-isomer and a first raffinate containing non-sorbed isomers including the 2,6-isomer, the 2,6-isomer being thereafter separated from the first raffinate.
    Type: Grant
    Filed: August 2, 1989
    Date of Patent: February 12, 1991
    Assignees: Chiyoda Corporation, NKK Corporation
    Inventors: Yoshimi Shiroto, Mitsunori Shimura, Kenji Shimokawa, Yoshio Fukui, Yakudo Tachibana, Kazuhiko Tate, Hiroaki Taniguchi
  • Patent number: 4950824
    Abstract: A process for the production of 2,6-diisopropylnaphthalene is disclosed wherein an isopropylation reaction mixture containing isopropylated naphthalenes is subjected to transalkylation with a triisopropylnaphthalene-containing mixture to obtain a mixture containing mono-, di- and tri-isopropylnaphthalenes which is then separated into a first fraction containing monisopropylnaphthalenes, a second fraction containing diisopropylnaphthalenes and a third fraction containing triisopropylnaphthalenes. The first and third fractions are recycled to the above system, while the second fraction is subjected to separation treatments for the recovery of 2,6-diisopropylnaphthalene. The second fraction from which 2,6-diisopropylnaphthalene has been removed is subjected to transalkylation with naphthalene to obtain a monoisopropylnaphthalene-rich mixture which is to be fed to the isopropylation step.
    Type: Grant
    Filed: August 2, 1989
    Date of Patent: August 21, 1990
    Assignees: Chiyoda Corporation, NKK Corporation
    Inventors: Yoshimi Shiroto, Mitsunori Shimura, Kenji Shimokawa, Yoshio Fukui, Sachio Asaoka, Hiroto Tajima, Kazuaki Ueda, Yakudo Tachibana, Kazuhiko Tate, Hiroaki Taniguchi
  • Patent number: 4942257
    Abstract: A method of manufacturing an alkali metal salt of 2,3,6,7-naphthalenetetracarboxylic acid. Either a sodium salt or a mixture of sodium salt and potassium salt of at least one naphthalenecarboxylic acid selected form the group consisting of naphthoic acids and naphthalenepolycarboxylic acids is heated to an elevated temperature in an inert gas atmosphere in the presence of a Henkel reaction catalyst and halogenated sodium.
    Type: Grant
    Filed: August 31, 1989
    Date of Patent: July 17, 1990
    Assignee: NKK Corporation
    Inventors: Yakudo Tachibana, Kazuhiko Tate, Toshifumi Suzuki, Kouji Chiba
  • Patent number: 4436657
    Abstract: A novel glycoprotein substance possessing a high antitumor activity is provided, which is recovered and isolated from the liquid portion coming from cooking of raw scallop with a hot aqueous solvent or vapor of such solvent and which is amphoteric electrolyte in nature with an average molecular weight of about 470,000 and with an isoelectric point of pH 5.5.
    Type: Grant
    Filed: August 2, 1983
    Date of Patent: March 13, 1984
    Assignee: Maruzen Oil Co., Ltd.
    Inventors: Takuma Sasaki, Kazuya Nakamichi, Yakudo Tachibana, Kiyoshi Minami
  • Patent number: 4436656
    Abstract: A novel glycoprotein substance possessing a high antitumor activity is provided, which is recovered and isolated from the liquid portion coming from cooking of raw scallop shellfish with a hot aqueous solvent or vapor of such solvent and which is amphoteric electrolyte in nature with an average molecular weight of about 5000 and with an isoelectric point of pH 5.2.
    Type: Grant
    Filed: August 2, 1983
    Date of Patent: March 13, 1984
    Assignee: Maruzen Oil Co., Ltd.
    Inventors: Takuma Sasaki, Kazuya Nakamichi, Yakudo Tachibana, Kiyoshi Minami