Patents by Inventor Ichiro Yokotake

Ichiro Yokotake 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).

  • Dihydroxysilicon compound and electrophotographic photoreceptor containing the compound
    Patent number: 6057071
    Abstract: An electrophotographic photoreceptor which is excellent in sensitivity, durability and environmental capability comprises a photosensitive layer containing dihydroxysilicon phthalocyanine which is monoclinic and has lattice constants a=12.8.+-.1.ANG., b=14.5.+-.1.ANG., c=6.8.+-.1.ANG. and .beta.=94.4.+-.1.degree..
    Type: Grant
    Filed: December 1, 1997
    Date of Patent: May 2, 2000
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Toyoshi Ohashi, Yasuko Osano, Yuko Kojima, Ichiro Yokotake, Hitoshi Ono, Yuka Nagao, Masatomi Ozawa
  • Method for producing an unsaturated glycol diester
    Patent number: 5177254
    Abstract: A method for producing an unsaturated glycol diester by reacting molecular oxygen, a carboxylic acid and a conjugated diene in the presence of a solid catalyst containing palladium and tellurium supported on a carrier, wherein an active carbon with the total pore volume of pores having radii of from 18 to 100,000 .ANG. being at least 0.45 cc/g and with the volume of pores having radii of at least 3,000 .ANG. constituting at least 50% of the total pore volume, is used as the carrier for the solid catalyst.
    Type: Grant
    Filed: February 4, 1988
    Date of Patent: January 5, 1993
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Junzo Haji, Ichiro Yokotake, Takahiro Yamaguchi, Masato Sato, Nobuyuki Murai
  • Process for producing monosilane
    Patent number: 4904460
    Abstract: A process for producing monosilane, which comprises disproportionating an alkoxysilane of the formula:H.sub.n Si(OR).sub.4-n (I)wherein R is an alkyl group having from 1 to 6 carbon atoms or a cycloalkyl group and n is an integer of 1, 2 or 3, in the presence of a catalyst, wherein the catalyst comprises at least one compound selected from the group consisting of aromatic alkoxides of the formula:MOAr (II)wherein M is a metal of Group Ia of the Periodic Table and Ar is a substituted or unsubstituted aromatic hydrocarbon group, and quaternary ammonium and phosphonium compounds of the formula:R.sup.1 R.sup.2 R.sup.3 R.sup.4 ZX (III)wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 which may be the same or different, is a substituted or unsubstituted alkyl or aryl group, Z is a nitrogen atom or a phosphorus atom and X is an anion.
    Type: Grant
    Filed: April 13, 1989
    Date of Patent: February 27, 1990
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Keisuke Wada, Junzo Haji, Ichiro Yokotake
  • Method for hydrogenating an aldehyde and/or a ketone
    Patent number: 4777302
    Abstract: A method for hydrogenating an aldehyde and/or a ketone in the presence of a ruthenium catalyst, wherein said ruthenium catalyst is obtained by reducing an alkali metal ruthenate with a reducing agent selected from the group consisting of methanol, formaldehyde and formic acid.
    Type: Grant
    Filed: July 30, 1987
    Date of Patent: October 11, 1988
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Junzo Haji, Ichiro Yokotake, Nobuyuki Murai, Toshihiro Kawakami