Patents by Inventor Yoshiyuki Kisaka

Yoshiyuki Kisaka 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).

  • Magneto optical recording medium
    Patent number: 5576102
    Abstract: A magneto optical recording medium comprising the following elements has been developed:a substrate;an interference layer of tantalum oxide having 500 to 1,200 .ANG. in thickness and formed on said substrate;a recording layer formed on said interference layer;a heat insulating layer of silicon nitride, silicon oxide or a mixture thereof having 200 to 500 .ANG. in thickness and formed on said recording layer; anda reflective layer of Al or an Al-based alloy having 400 to 1,200 .ANG. in thickness and formed on said heat insulating layer.
    Type: Grant
    Filed: June 3, 1994
    Date of Patent: November 19, 1996
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Yoshiyuki Kisaka, Ichiro Nobuhara, Seiki Nojiri, Toshifumi Kawano
  • Read-only optical disk containing a reflective layer comprising an Al alloy containing Ta
    Patent number: 5276673
    Abstract: Disclosed herein is a read-only optical disk comprising an annulus transparent substrate of a synthetic resin having information pits thereon, a reflective layer comprising an Al alloy containing Ta and a protective layer provided thereover. The read-only optical disk according to the present invention is excellent in the corrosion resistance and has a high reliability.
    Type: Grant
    Filed: May 16, 1990
    Date of Patent: January 4, 1994
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Yoshimitsu Kobayashi, Yoshiyuki Kisaka, Takashi Hashimoto, Toshifumi Kawano, Mitsugu Wakabayashi
  • Optical recording medium and process for producing the same
    Patent number: 4839207
    Abstract: Disclosed herein is an optical recording medium for recording informations by irradiating the optical recording medium with a laser beam to form a hole or a deformed part thereon, said optical recording medium comprising a substrate and a recording layer containing at least Te, Se and F in the amounts of from 35 to 94.9 atomic % of Te, from 5 to 25 atomic % of Se and from 0.1 to 40 atomic % of F, produced by a reactive sputtering, said Se being derived from selenium fluoride and a sputtering target of Te or a sputtering target comprising Te-Se-alloy, and a process for producing the same.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: June 13, 1989
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Toshihiko Yoshitomi, Yoshimitsu Kobayashi, Yoshiyuki Kisaka, Hidemi Yoshida, Michikazu Horie, Takanori Tamura, Mitsuaki Ohgaki
  • Process for preparing lithographic printing plate bases
    Patent number: 4367124
    Abstract: There is disclosed a process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an electrolytic solution containing hydrochloric acid and a .beta.-dicarbonyl compound.
    Type: Grant
    Filed: July 2, 1981
    Date of Patent: January 4, 1983
    Assignee: Mitsubishi Chemical Industries, Limited
    Inventors: Nobuji Kikuchi, Yoshiyuki Kisaka, Kazuo Torige, Masayuki Onose
  • Process for preparing lithographic printing plate bases
    Patent number: 4339315
    Abstract: There is disclosed a process for preparing lithographic printing plate bases, which comprises electrolytically etching a sheet made of aluminum or an aluminum alloy in an aqueous electrolytic solution containing hydrochloric acid and citric or malic acid at a bath temperature of 10.degree. to 40.degree. C.
    Type: Grant
    Filed: March 6, 1981
    Date of Patent: July 13, 1982
    Assignee: Mitsubishi Chemical Industries Limited
    Inventors: Nobuji Kikuchi, Yoshiyuki Kisaka, Kazuo Torige, Masayuki Onose