Patents by Inventor Takeshi Koizumi

Takeshi Koizumi 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: 20040265822
    Abstract: To prepare high-performance specific gene-amplification primers for detecting, quantitatively determining or identifying Vibrio parahaeinolyticus having low possibility of mis-identification and practically sufficient amplification efficiency and amplification specificity.
    Type: Application
    Filed: January 30, 2004
    Publication date: December 30, 2004
    Inventors: Takeshi Koizumi, Satoshi Yamamoto, Takeshi Itoh, Hiroshi Nakagawa
  • Publication number: 20040110182
    Abstract: The present invention has an object of providing a process for improving the efficiency of a DNA amplification reaction, and a process for improving the hybridization specificity of an oligonucleotide to a DNA.
    Type: Application
    Filed: June 20, 2003
    Publication date: June 10, 2004
    Applicant: Nichirei Corporation
    Inventors: Takeshi Koizumi, Yoko Hamano, Satoshi Yamamoto
  • Patent number: 6705193
    Abstract: An optical fiber band for decoration is formed of a plurality of optical fibers woven obliquely in a band shape. The band forms a mesh pattern, where each of the optical fibers changes positions above or below at least every two other fibers in a longitudinal direction of the fiber.
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: March 16, 2004
    Inventor: Takeshi Koizumi
  • Publication number: 20030110930
    Abstract: An optical fiber band for decoration is formed of a plurality of optical fibers woven obliquely in a band shape. The band forms a mesh pattern, where each of the optical fibers changes positions above or below at least every two other fibers in a longitudinal direction of the fiber.
    Type: Application
    Filed: July 30, 2002
    Publication date: June 19, 2003
    Inventor: Takeshi Koizumi
  • Patent number: 6501728
    Abstract: An over-writable magneto-optical recording medium in which a recording section has at least a first dielectric layer, a first recording layer, a second recording layer, and a second dielectric layer formed sequentially and a reflective layer and a protective layer formed on the recording section. A groove is formed on the transparent substrate along a recording track, both sidewalls of the groove are formed into an independent wobbling shape, a relationship of 0.470 ≦W/Ø≦0.610 is effectuated where the width of the groove as W, and a relationship of 0.120≦D(&lgr;/n)≦0.142 is effectuated where the depth of the groove as D, and the angle Ø between wall faces of the groove is 150°±10. a relationship of 0.55≦(d2/d1)≦0.9 is effectuated when assuming the thickness of the first dielectric is d1 and the reflective layer is d2.
    Type: Grant
    Filed: April 19, 2001
    Date of Patent: December 31, 2002
    Assignee: Sony Corporation
    Inventors: Takeshi Koizumi, Norio Adachi, Hiroyuki Sakai
  • Patent number: 6480461
    Abstract: A recording medium cartridge housing a disc wherein the vibration of the disc can be reduced by printing a vibration isolating ink layer containing acrylic particles and having a projecting and depressing surface on a portion including at least a support area of an upper half of the cartridge housing. The isolating ink layer acts by absorbing the vibration transmitted to the cartridge housing.
    Type: Grant
    Filed: October 10, 2000
    Date of Patent: November 12, 2002
    Assignee: Sony Corporation
    Inventors: Taku Watanabe, Takeshi Koizumi
  • Publication number: 20020054564
    Abstract: An over-writable magneto-optical recording medium in which a recording section has at least a first dielectric layer, a first recording layer, a second recording layer, and a second dielectric layer formed sequentially and a reflective layer and a protective layer formed on the recording section. A groove is formed on the transparent substrate along a recording track, both sidewalls of the groove are respectively formed into an independent wobbling shape, a relationship of 0.470≦W/Ø≦0.610 is effectuated when assuming the width of the groove as W, and a relationship of 0.120≦D(&lgr;/n)≦0.142 is effectuated when assuming the depth of the groove as D, and the angle ⊖ between wall faces of the groove is kept at 150°±10°.
    Type: Application
    Filed: April 19, 2001
    Publication date: May 9, 2002
    Inventors: Takeshi Koizumi, Norio Adachi, Hiroyuki Sakai
  • Patent number: 6268043
    Abstract: A magnetic recording medium which is capable of improving durability and reliability while satisfactory electromagnetic conversion characteristics are being maintained, the magnetic recording medium incorporating a non-magnetic support member; and a magnetic layer formed on the non-magnetic support member and mainly composed of magnetic powder and a binder and having a two-layer structure composed of a first magnetic layer and a second magnetic layer, wherein Young's modulus of the first magnetic layer is 140×105 N/m2 to 160×105 N/m2 and Young's modulus of the second magnetic layer is 45×105 N/m2 to 50×105 N/m2. The specific surface area of the magnetic powder for use in the first magnetic layer is 42 m2/g to 46 m2/g and the specific surface area of the magnetic powder for use in the second magnetic layer is 32 m2/g to 35 m2/g.
    Type: Grant
    Filed: February 16, 2000
    Date of Patent: July 31, 2001
    Assignee: Sony Corporation
    Inventors: Takeshi Koizumi, Miwako Sato, Norio Adachi
  • Patent number: 5997987
    Abstract: This invention intends to offer a magnetic recording medium which is so devised as to give a wide dynamic range and a flat response over whole audible frequencies.This invention attains the object by providing a magnetic recording medium which has two magnetic layers each composed mainly of ferromagnetic powder and a binder spread one over the other on one surface (front surface) of a non-magnetic substrate, wherein the ferromagnetic powder of either magnetic layer has a coercive force of 54.0-59.0 kA/m, and the coercive forces of the two magnetic layers differ by 3.2 kA/m or less. In addition, if a phase shift has to be minimized, the frictional coefficient of the back surface, and roughness (Ra.sup.f) of the magnetic surface with respect to that (Ra.sup.b) of the back surface or Ra.sup.f /Ra.sup.b should be adjusted properly.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: December 7, 1999
    Assignee: Sony Corporation
    Inventors: Takeshi Koizumi, Norio Adachi, Miwako Sato
  • Patent number: 5932340
    Abstract: A magnetic recording medium exhibiting not only good durability and traveling reliability but also improved static magnetic properties and electromagnetic transduction characteristics can be obtained according to the present invention. The magnetic recording medium includes a non-magnetic substrate and a magnetic layer composed of a magnetic powder, a binder and a lubricant, wherein the binder contains not less than 50% by weight of a polyester-polyurethane resin having a number-average molecular weight (Mn) of not greater than 15,000 and a ratio of a weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of not smaller than 2.5.
    Type: Grant
    Filed: May 28, 1998
    Date of Patent: August 3, 1999
    Assignee: Sony Corporation
    Inventors: Masahiro Sawaguchi, Hiroshi Kudo, Takeshi Koizumi, Yuko Abe, Kazuhiko Suzuki
  • Patent number: 5800915
    Abstract: A magnetic recording medium exhibiting not only good durability and traveling reliability but also improved static magnetic properties and electromagnetic transduction characteristics can be obtained according to the present invention. The magnetic recording medium includes a non-magnetic substrate and a magnetic layer composed of a magnetic powder, a binder and a lubricant, wherein the binder contains not less than 50% by weight of a polyester-polyurethane resin having a number-average molecular weight (Mn) of not greater than 15,000 and a ratio of a weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of not smaller than 2.5.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: September 1, 1998
    Assignee: Sony Corporation
    Inventors: Masahiro Sawaguchi, Hiroshi Kudo, Takeshi Koizumi, Yuko Abe, Kazuhiko Suzuki