Patents by Inventor Koji Tatsumi

Koji Tatsumi 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).

  • Publication number: 20060222951
    Abstract: A positive electrode material for a lithium secondary battery for high voltage high capacity use exhibiting high cycle durability and high safety. The positive electrode material is composed of particles having a composition represented by the general formula: LiaCObMgcAdOeFf (A is the group 6 transition element or the group 14 element, 0.90?a?1.10, 0.97?b?1.00, 0.0001?c>0.03, 0.0001?d?0.03, 1.98?e?2.02, 0?f?0.02 and 0.0001?c+d?0.03), and magnesium, the element A and fluorine exist uniformly in the vicinity of the surfaces of the particles.
    Type: Application
    Filed: August 16, 2004
    Publication date: October 5, 2006
    Inventors: Koji Tatsumi, Toshiaki Abe, Naoshi Saito, Manabu Suhara
  • Publication number: 20060154146
    Abstract: It is to provide a positive electrode active material for a lithium secondary battery, which has a large volume capacity density and high safety, is excellent in uniform coating properties and is excellent in the charge and discharge cyclic durability and low temperature characteristics even at a high charge voltage. A process for producing a lithium-containing composite oxide represented by the formula LipQqNxMyOzFa (wherein Q is at least one element selected from the group consisting of titanium, zirconium, niobium and tantalum, N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than the Q element and the N element, 0.9?p?1.1, 0<q?0.03, 0.97?x<1.00, 0?y<0.03, 1.9?z?2.1, q+x+y=1 and 0?a?0.
    Type: Application
    Filed: March 10, 2006
    Publication date: July 13, 2006
    Applicant: Seimi Chemical Co., Ltd.
    Inventors: Takeshi Kawasato, Naoshi Saito, Megumi Uchida, Kazushige Horichi, Koji Tatsumi, Kunihiko Terase, Manabu Suhara
  • Publication number: 20060109849
    Abstract: A first communication device receives an ATM cell bound for a second ATM device from a first ATM device via an ATM interface, and then the first communication device sends a data frame including the ATM cell to the second ATM device via wide area Ethernet. In addition, the first communication device sends a synchronization frame to the second ATM device via the wide area Ethernet continuously at a predetermined time interval in accordance with a clock frequency of the first ATM device. A second communication device receives the synchronization frame and measures a clock frequency of the first ATM device in accordance with a time interval of receiving the synchronization frame so as to reproduce a clock having the same frequency as the measured clock frequency. After that, the second communication device sends the clock to the second ATM device via an ATM interface.
    Type: Application
    Filed: April 25, 2005
    Publication date: May 25, 2006
    Applicant: FUJITSU LIMITED
    Inventors: Norihisa Uchimoto, Koji Tatsumi, Kazuhisa Shimazaki, Koichiro Yamada, Satoshi Namura, Akio Morimoto, Michio Kusayanagi
  • Publication number: 20050250013
    Abstract: There is obtained a material of a positive electrode for a secondary lithium-ion cell having high cycle durability and high safety in high-voltage and high-capacity applications, which is a particulate positive electrode active material for a secondary lithium-ion cell represented by a general formula, LiaCObAcBdOeFf (A is Al or Mg, B is a group-IV transition element, 0.90?a?1.10, 0.97?b?1.00, 0.0001?c?0.03, 0.0001?d?0.03, 1.98?e?2.02, 0?f?0.02, and 0.0001?c+d?0.03), where element A, element B and fluorine are evenly present in the vicinity of the particle surfaces.
    Type: Application
    Filed: June 6, 2003
    Publication date: November 10, 2005
    Applicant: Seimi Chemical Co., Ltd.
    Inventors: Koji Tatsumi, Manabu Suhara, Naoshi Saito, Kazushige Horichi, Yukio Jitsugiri
  • Publication number: 20050220701
    Abstract: To provide a process for producing a lithium-cobalt composite oxide for a positive electrode of a lithium secondary battery excellent in volume capacity density, safety, charge and discharge cyclic durability, press density and productivity, by using in expensive cobalt hydroxide and lithium carbonate. A mixture having a cobalt hydroxide powder and a lithium carbonate powder mixed so that the atomic ratio of lithium/cobalt would be from 0.98 to 1.01, is fired in an oxygen-containing atmosphere at from 250 to 700° C., and the fired product is further fired in an oxygen-containing atmosphere at from 850 to 1,050° C., or such a mixture is heated at a temperature-raising rate of at most 4° C./min in a range from 250 to 600° C. and fired in an oxygen-containing atmosphere at from 850 to 1,050° C.
    Type: Application
    Filed: May 13, 2005
    Publication date: October 6, 2005
    Applicant: Seimi Chemical Co., Ltd.
    Inventors: Manabu Suhara, Naoshi Saito, Kazushige Horichi, Koji Tatsumi
  • Publication number: 20040217327
    Abstract: The present invention relates to a method for readily producing an anode for rechargeable batteries having conflicting properties in good balance, including the corrosion resistance and the activities such as the initial activity and the high rate discharge performance, and having excellent recyclability. The method includes the steps of mixing and molding anode materials containing an electrically conductive material and at least two kinds of AB5 type hydrogen storage alloys, wherein said alloys have substantially single phase structures and the same composition, wherein each of the alloys have an average crystal long axis diameter of 30 to 350 &mgr;m, and wherein the alloys have different ratios (D1/D2) of the average crystal long axis diameter (D1) to the average short axis diameter (D2).
    Type: Application
    Filed: December 4, 2003
    Publication date: November 4, 2004
    Inventors: Kiyofumi Takamaru, Hideaki Ikeda, Koji Tatsumi
  • Publication number: 20040159377
    Abstract: The present invention relates to hydrogen storage alloys, methods for producing the same, and anodes produced with such alloys for nickel-hydrogen rechargeable batteries. The alloys are useful as electrode materials for nickel-hydrogen rechargeable batteries, excellent, when used as anode materials, in corrosion resistance or activity such as initial activity and high rate discharge performance, of low cost compared to the conventional alloys with a higher Co content, and recyclable. The alloys are of a composition represented by the formula (1), and has a substantially single phase structure, and the crystals thereof have an average long axis diameter of 30 to 160 &mgr;m, or not smaller than 5 &mgr;m and smaller than 30 &mgr;m. The present anodes for rechargeable batteries contain at least one of these hydrogen storage alloys.
    Type: Application
    Filed: March 5, 2004
    Publication date: August 19, 2004
    Inventors: Kiyofumi Takamaru, Hideaki Ikeda, Koji Tatsumi
  • Patent number: 6487173
    Abstract: A network system comprises a first communication device and a second communication device. When device failure caused in the first communication device, the first communication device generates the device failure information and transmits the device failure information to the second communication device. The second communication device receives the device failure information, and memorizes the device failure information, and makes a display unit display the device failure information.
    Type: Grant
    Filed: March 16, 1998
    Date of Patent: November 26, 2002
    Assignee: Fujitsu Limited
    Inventor: Koji Tatsumi
  • Publication number: 20020003778
    Abstract: A network system comprises a first communication device and a second communication device. When device failure caused in the first communication device, the first communication device ganerates the device failure information and transmits the device failure information to the second communication device. The second communication device receives the device failure information, and memorizes the device failure information, and makes a display unit display the device failure information.
    Type: Application
    Filed: March 16, 1998
    Publication date: January 10, 2002
    Inventor: KOJI TATSUMI