Patents by Inventor Katsuyuki Takeda

Katsuyuki Takeda 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: 5215833
    Abstract: A magnetic recording medium is disclosed. The medium comprises a non-magnetic support and, provided thereon, plural magnetic layers comprising the uppermost magnetic layer having a thickness of 1.5 .mu.m or less and lower magnetic layers, said plural magnetic layers containing a ferromagnetic powder, a binder and a lubricant, wherein a dynamic friction coefficient of the uppermost layer against a metal pin is 0.25 or less under the condition of a temperature of 20.degree. C. and a relative humidity of 60%, and 0.20 or less under the condition of a temperature of 40.degree. C. and a relative humidity of 20%.
    Type: Grant
    Filed: June 20, 1991
    Date of Patent: June 1, 1993
    Assignee: Konica Corporation
    Inventors: Narito Goto, Katsuyuki Takeda, Kunitsuna Sasaki, Nobuyuki Sekiguchi
  • Patent number: 5149585
    Abstract: A magnetic recording medium is disclosed, which is improved in electromagnetic conversion properties. The recording medium comprises a support, an uppermost magnetic mayer being provided on the support and one or more lower magnetic layers being provided between the support and the uppermost magnetic layer, in which the uppermost magnetic layer comprises a binder and a hexagonal magnetic powder and has a layer thickness of from 0.1 .mu.m to 1.0 .mu.m, and at least one of the lower magnetic layer comprises a binder having a anionic functional group and a magnetic powder, and has a coercive force of from 500 Oe to 1200 Oe, and the uppermost magnetic layer and the lower layer were formed on the support by wet-on-wet simultaneous multi-layer coating.
    Type: Grant
    Filed: July 8, 1991
    Date of Patent: September 22, 1992
    Assignee: Konica Corporation
    Inventors: Narito Goto, Katsuyuki Takeda, Kunitsuna Sasaki, Nobuyuki Sekiguchi
  • Patent number: 4751124
    Abstract: An information recording medium such as a magneto-optical recording medium is disclosed. The medium comprises two pieces of recording elements. Each element comprises a support and a recording layer provided on a part of one surface of the support. The two pieces of the elements adhere to each other by a non-corrosion-causing adhesive provided on a part of said surface where a recording layer is provided and a fast-hardening adhesive provided on a part of the surface where no recording layer is provided. The time required to adhere the two pieces of the elements can be considerably decreased and the corrosion of the recording layer by the adhesive can be avoided.
    Type: Grant
    Filed: February 13, 1987
    Date of Patent: June 14, 1988
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Takahiro Matsuzawa, Katsuyuki Takeda, Hiromichi Enomoto, Yoshitaka Takahashi, Shozo Ishibashi