Patents by Inventor Hajime Kondo

Hajime Kondo 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: 6472464
    Abstract: A styrene-butadiene copolymer having excellent low hysteresis loss characteristic, wet skid resistance, fracture characteristics, and abrasion resistance and a rubber composition comprising the copolymer are disclosed. The styrene-butadiene copolymer has a total styrene content in the range of 33 to 42% by weight of the styrene-butadiene copolymer; a content of styrene sequences having 4 to 20 styrene units in the range of 40 to 65% by weight of the total styrene content, as obtained by measurements by NMR and GPC; a content of styrene sequences having more than 20 styrene units in the range of 5% by weight or less of the total styrene content, as obtained by measurement by GPC; a content of vinyl unit in the range of 30% by mol or less of a butadiene part of the styrene-butadiene copolymer; a sum of the total styrene value and ½ of the content of vinyl units in the range of 46 to 52%; and an inner or end structure having, for example tin-carbon bond.
    Type: Grant
    Filed: March 27, 1997
    Date of Patent: October 29, 2002
    Assignee: Bridgestone Corporation
    Inventors: Koichi Morita, Hajime Kondo, Yoichi Ozawa
  • Publication number: 20020156169
    Abstract: A rubber composition comprises a polar group-containing diene polymer synthesized through an emulsion polymerization as a rubber component, and an inorganic filler represented by a formula of mM.xSiOy.zH2O wherein M is a metal selected from the group consisting of aluminum, magnesium, titanium and calcium, an oxide or a hydroxide of such a metal or an hydrate thereof, m is an integer of 1 to 5, x is an integer of 0 to 10, y is an integer of 2 to 5 and z is an integer of 0 to 10.
    Type: Application
    Filed: December 21, 2001
    Publication date: October 24, 2002
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Hajime Kondo, Kazuhiro Yanagisawa, Tomohisa Konno, Yoshiyuki Udagawa, Toshihiro Tadaki
  • Publication number: 20020103089
    Abstract: A lubricant composition for a surface treatment of a steel filament comprises at least one specified compound as a lubricant component and a rubber-steel filament composite body is prepared by using a steel filament treated with the lubricant composition.
    Type: Application
    Filed: June 29, 2001
    Publication date: August 1, 2002
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yasuo Fukushima, Hajime Kondo
  • Patent number: 6369167
    Abstract: The object of the present invention is to provide a modified diene polymer capable of creating good reinforcing characteristics and filler dispersing effect independently of the kinds of the filler as well as a process for making the polymer and to provide a rubber composition having good fracture characteristics, wear resistance, and low exothermicity without the impairment of wet performance.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: April 9, 2002
    Assignee: Bridgestone Corporation
    Inventors: Koichi Morita, Hajime Kondo
  • Patent number: 6010563
    Abstract: A nontoxic anticorrosive pigment composition free from toxic heavy metals comprises a condensed phosphoric acid aluminum salt, typically aluminum dihydrogen tripolyphosphate, and magnesium silicate, typically magnesium hexasilicate. The anticorrosive pigment composition enhances the thermal resistance of paint films when formulated in a coating composition containing a chlorine-containing vinyl polymer such as vinyl chloride-vinylidene chloride copolymer emulsion paints.
    Type: Grant
    Filed: December 2, 1997
    Date of Patent: January 4, 2000
    Assignee: Tayca Corporation
    Inventors: Yukihiko Taketani, Hajime Kondo
  • Patent number: 5482544
    Abstract: The disclosure describes a rust-preventive composition comprising a layered phosphate whose active hydrogen is reacted with ammonia in an amount of 20 to 80 mol % based on the total amount of hydrogen of the layered phosphate, and an amphoteric or basic oxide, a ratio by weight of the layered phosphate to the amphoteric or basic oxide being 10:1 to 1:10.
    Type: Grant
    Filed: July 14, 1994
    Date of Patent: January 9, 1996
    Assignee: Tayca Corporation
    Inventors: Masaaki Okuda, Hajime Kondo, Eiji Fujiwara