Patents by Inventor Toshiaki Kitano

Toshiaki Kitano 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).

  • Etching solution and etching method for semiconductors and method for evaluating GaAs surface
    Patent number: 5468343
    Abstract: An etchant includes a mixture of an organic acid, hydrogen peroxide, and a base added to adjust the pH. The etching solution has an eminent difference in the etching rates between GaAs and AlGaAs, GaAs and InGaAs, AlGaAs and InGaAs, InGaAs and AlGaAs, and InGaAs and GaAs. High selectivity etching is completed easily and with high precision. Precise control of etching of a heterostructure is achieved.
    Type: Grant
    Filed: March 18, 1994
    Date of Patent: November 21, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toshiaki Kitano
  • Etching solution and etching method for semiconductors
    Patent number: 5419808
    Abstract: An etchant includes an organic acid and hydrogen peroxide mixed in a volume ratio of 1:1 to 200:1 with a basic material added to adjust the pH. The etching solution presents an eminent difference in the etching rates between GaAs/AlGaAs, GaAs/InGaAs, AlGaAs/InGaAs, InGaAs/AlGaAs, and InGaAs/GaAs. High selectivity etching is completed easily and with high precision. Precise control of etching of a heterostructure is achieved.
    Type: Grant
    Filed: November 22, 1993
    Date of Patent: May 30, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Toshiaki Kitano
  • Process for the preparation of acetal polymer or copolymer
    Patent number: 4931535
    Abstract: Acetal polymer and copolymer are prepared by polymerizing formaldehyde or its cyclic oligomer as a principal monomer, or copolymerizing the principal monomer with a comonomer copolymerizable therewith, using an isopoly acid or an acid salt thereof as a polymerization catalyst.
    Type: Grant
    Filed: May 1, 1989
    Date of Patent: June 5, 1990
    Assignee: Polyplastics Co., Ltd.
    Inventors: Kaoru Yamamoto, Toshiaki Kitano, Hiroyuki Sano
  • Sealed multi-row roller bearing device for rolling mills
    Patent number: 4527915
    Abstract: A sealed multi-row roller bearing device for rolling mills, wherein the opposite ends of the inner race are extended, and a plurality of inner annular bodies which are of one of the groups of elements defining labyrinths are fitted on the extension of the inner race, while outer annular bodies which are of the other group of elements defining labyrinths are removably connected to the end of the outer race.
    Type: Grant
    Filed: May 29, 1984
    Date of Patent: July 9, 1985
    Assignees: Kawasaki Steel Corporation, Koyo Seiko Company Limited
    Inventors: Koichi Ikariishi, Toshiaki Kitano, Masanori Shinohara, Yasuo Shimoji