Patents by Inventor Yoshiko Kurosawa

Yoshiko Kurosawa 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).

  • Negative electrode for lithium secondary battery and lithium secondary battery using the negative electrode
    Patent number: 5900336
    Abstract: A negative electrode for a lithium secondary battery includes at least two kinds of carbon materials with a spacing of lattice plane (d.sub.002) of 3.4 .ANG. or less in the direction of the C axis thereof. A lithium secondary battery using this negative electrode is provided.
    Type: Grant
    Filed: August 6, 1997
    Date of Patent: May 4, 1999
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiyuki Kabata, Yoshiko Kurosawa, Toshiyuki Ohsawa, Nobuo Katagiri, Okitoshi Kimura, Toshishige Fujii, Yoshitaka Hayashi, Hiroyuki Iechi, Yumiko Suzuki, Tomohiro Inoue
  • Non-aqueous secondary lithium battery
    Patent number: 5885733
    Abstract: A non-aqueous secondary lithium battery includes a positive electrode; a negative electrode which including at least one component selected from the group consisting of lithium, a lithium alloy, and a host compound which forms an intercalation compound or complex in combination with lithium; and an electrolytic solution or solid electrolyte containing a silicone compound.
    Type: Grant
    Filed: July 18, 1997
    Date of Patent: March 23, 1999
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiyuki Ohsawa, Toshiyuki Kabata, Yoshiko Kurosawa, Okitoshi Kimura, Toshishige Fujii, Nobuo Katagiri, Yoshitaka Hayashi
  • Magneto-optical recording method
    Patent number: 5459701
    Abstract: A magneto-optical recording method is capable of carrying out overwriting on a magneto-optical recording medium including a single perpendicular magnetic layer serving as a recording layer, by applying laser beams thereto, thereby controlling the formation and erasure of magnetic domains, in which a magnetic domain with a desired length can be formed or erased by the application of a plurality of laser beams during the formation and erasure of the magnetic domains.
    Type: Grant
    Filed: June 17, 1992
    Date of Patent: October 17, 1995
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiaki Tokita, Motoharu Tanaka, Atsuyuki Watada, Yoshiko Kurosawa
  • Magneto-optical recording medium having first and second magnetic layers
    Patent number: 5420833
    Abstract: A magneto-optical recording medium is composed of a first magnetic layer and a second magnetic layer, which are overlaid, each having a perpendicular magnetic anisotropy, and the first magnetic layer having a Curie temperature of Tc.sub.1, a saturation magnetization of Ms.sub.1, a coercive force of Hc.sub.1, and a thickness of t.sub.1, the second magnetic layer having a compensation temperature of Tcomp.sub.2, a Curie temperature Tc.sub.2, and a coercive force of Hc.sub.2, and which satisfies the relationships:Troom<Tc.sub.1 <Tcomp.sub.2 <Tc.sub.2Hc.sub.1 >Hc.sub.2Hc.sub.1 >.sigma.w/2Ms.sub.1 t.sub.1wherein Troom is room temperature, and .sigma.w is the interface wall energy between the first magnetic wall and the second magnetic wall, and a magneto-optical recording method using this magneto-optical recording medium is provided, in which the application of a magnetic field for initialization of the magneto-optical recording medium is not required.
    Type: Grant
    Filed: November 17, 1993
    Date of Patent: May 30, 1995
    Assignee: Ricoh Company, Ltd.
    Inventors: Motoharu Tanaka, Atsuyuki Watada, Masaetsu Takahashi, Hiroshi Deguchi, Toshiaki Tokita, Yoshiko Kurosawa