Patents by Inventor Yuki Kuroiwa

Yuki Kuroiwa 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: 20200222370
    Abstract: Provided is a pharmaceutical composition containing pemafibrate, a salt thereof or a solvate thereof and having excellent storage stability. The pharmaceutical composition is provided to contain pemafibrate, a salt thereof or a solvate thereof, wherein a pH value of a solution produced by dissolving or dispersing the pharmaceutical composition in water is 7 or more.
    Type: Application
    Filed: June 29, 2018
    Publication date: July 16, 2020
    Applicant: KOWA COMPANY, LTD.
    Inventors: Yuki KUROIWA, Akito MINAMIZONO
  • Patent number: 10392293
    Abstract: The present invention provides a high-transparency glass having a high fining action at a low temperature and capable of achieving redox lowering more than before. The present invention relates to a glass containing 1 to 500 ppm of a total iron oxide (t-Fe2O3) in terms of Fe2O3, having a redox ([divalent iron (Fe2+) in terms of Fe2O3]/[total (Fe2++Fe3+) of divalent iron (Fe2+) and trivalent iron (Fe3+) in terms of Fe2O3]) of 0% or more and 25% or less, containing, as expressed by mass percentage based on oxides, 50 to 81% of SiO2, 1 to 20% of Al2O3, 0 to 5% of B2O3, 5 to 20% of Li2O+Na2O+K2O, and 5 to 27% of MgO+CaO+SrO+BaO, and having a bubble disappearance-starting temperature (TD) of 1485° C. or lower.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: August 27, 2019
    Assignee: AGC Inc.
    Inventors: Yusaku Matsuo, Yutaka Kuroiwa, Yusuke Arai, Hiroyuki Hijiya, Yuki Kondo
  • Patent number: 6984350
    Abstract: An apparatus for manufacturing a transversely aligned web has a spinning device provided with a plurality of nozzles for extruding molten polymer as filaments, and a conveyor on which the filaments spun by the spinning device are piled and traveling in a direction cross to the direction of array of the nozzles. The spinning device is provided with a high-speed fluid blowing unit for blowing a high-speed fluid in a direction parallel with a direction in which the filaments are extruded from the nozzles so as to attenuate the filaments. Further, the apparatus for manufacturing the transversely aligned web has at least one air stream vibrating mechanism for cyclically changing the flowing direction of the high-speed fluid blown from the high-speed fluid blowing unit in a direction cross to the machine direction of the conveyor. The filaments are vibrated in a direction cross to the machine direction of the conveyor, owing to the high-speed fluid by the air stream vibrating unit.
    Type: Grant
    Filed: February 26, 2002
    Date of Patent: January 10, 2006
    Assignees: Nippon Petrochemicals Co., Ltd., Polymer Processing Research Institute Ltd.
    Inventors: Yuki Kuroiwa, Kazuhiko Kurihara, Kazuhiro Yabe, Shin-ichi Umejima, Yoshiro Morino
  • Patent number: 6637128
    Abstract: A transversely stretched nonwoven fabric is manufactured by transversely stretching a nonwoven fabric. First, an original web comprising a plurality of un-oriented filaments is heated to a temperature higher than its stretch suitable temperature by 5° C. or more. Next, the heated original web is stretched at a rate of 1.2 to 3 in its transverse direction to stretch the filaments of the original web with almost no molecular orientation involved. Then, the original web stretched transversely at a rate of 1.2 to 3 is heated to the stretch suitable temperature and the original web is further stretched transversely at the stretch suitable temperature. With these steps, a transversely stretched nonwoven fabric in which the original web is stretched transversely at a rate of 7 times or more in total as compared with the state of the stretch thereof is manufactured with a high tensile strength of 132.5 mN/tex (1.5 g/d) in the transverse direction.
    Type: Grant
    Filed: December 4, 2002
    Date of Patent: October 28, 2003
    Assignees: Nippon Petrochemicals Co., Ltd., Polymer Processing Research Institute Ltd.
    Inventors: Yuki Kuroiwa, Yoshiro Morino, Kazuhiko Kurihara, Shuichi Murakami
  • Patent number: 6605553
    Abstract: A multiaxial laminated non-woven fabric is formed with tows overlaid and bonded with one another. The starting material tow is crimped and has a total tex of not more than 300,000 and filaments in the tow have an average fineness of not more than 3 tex. A three-dimensional molded product made from the multiaxial non-woven fabric is also provided. The non-woven tow fabric of ensured quality is produced by bonding tows multiaxially and obliquely overlaid with one another, for example by needle punching or heat treatment, while the tows are held by pins of an overlaying machine.
    Type: Grant
    Filed: December 26, 2000
    Date of Patent: August 12, 2003
    Assignee: Polymer Processing Research Institute, Ltd.
    Inventors: Yuki Kuroiwa, Kazuhiko Kurihara, Yasuo Sasaki
  • Publication number: 20030082976
    Abstract: A transversely stretched nonwoven fabric is manufactured by transversely stretching a nonwoven fabric. First, an original web comprising a plurality of un-oriented filaments is heated to a temperature higher than its stretch suitable temperature by 5° C. or more. Next, the heated original web is stretched at a rate of 1.2 to 3 in its transverse direction to stretch the filaments of the original web with almost no molecular orientation involved. Then, the original web stretched transversely at a rate of 1.2 to 3 is heated to the stretch suitable temperature and the original web is further stretched transversely at the stretch suitable temperature. With these steps, a transversely stretched nonwoven fabric in which the original web is stretched transversely at a rate of 7 times or more in total as compared with the state of the stretch thereof is manufactured with a high tensile strength of 132.5 mN/tex (1.5 g/d) in the transverse direction.
    Type: Application
    Filed: December 4, 2002
    Publication date: May 1, 2003
    Inventors: Yuki Kuroiwa, Yoshiro Morino, Kazuhiko Kurihara, Shuichi Murakami
  • Publication number: 20030082977
    Abstract: A transversely stretched nonwoven fabric is manufactured by transversely stretching a nonwoven fabric. First, an original web comprising a plurality of unoriented filaments is heated to a temperature higher than its stretch suitable temperature by 5° C. or more. Next, the heated original web is stretched at a rate of 1.2 to 3 in its transverse direction to stretch the filaments of the original web with almost no molecular orientation involved. Then, the original web stretched transversely at a rate of 1.2 to 3 is heated to the stretch suitable temperature and the original web is further stretched transversely at the stretch suitable temperature. With these steps, a transversely stretched nonwoven fabric in which the original web is stretched transversely at a rate of 7 times or more in total as compared with the state of the stretch thereof is manufactured with a high tensile strength of 132.5 mN/tex (1.5 g/d) in the transverse direction.
    Type: Application
    Filed: December 4, 2002
    Publication date: May 1, 2003
    Inventors: Yuki Kuroiwa, Yoshiro Morino, Kazuhiko Kurihara, Shuichi Murakami
  • Publication number: 20030077968
    Abstract: A transversely stretched nonwoven fabric is manufactured by transversely stretching a nonwoven fabric. First, an original web comprising a plurality of un-oriented filaments is heated to a temperature higher than its stretch suitable temperature by 5° C. or more. Next, the heated original web is stretched at a rate of 1.2 to 3 in its transverse direction to stretch the filaments of the original web with almost no molecular orientation involved. Then, the original web stretched transversely at a rate of 1.2 to 3 is heated to the stretch suitable temperature and the original web is further stretched transversely at the stretch suitable temperature. With these steps, a transversely stretched nonwoven fabric in which the original web is stretched transversely at a rate of 7 times or more in total as compared with the state of the stretch thereof is manufactured with a high tensile strength of 132.5 mN/tex (1.5 g/d) in the transverse direction.
    Type: Application
    Filed: December 4, 2002
    Publication date: April 24, 2003
    Inventors: Yuki Kuroiwa, Yoshiro Morino, Kazuhiko Kurihara, Shuichi Murakami
  • Patent number: 6524521
    Abstract: An apparatus for manufacturing a nonwoven fabric has a spinning mechanism having a plurality of nozzles for extruding filaments, and a conveyor for collecting and delivering the extruded filaments. Between the spinning mechanism and the conveyor, there are disposed a high-speed air stream generating mechanism for generating a high-speed air stream to carry the filaments extruded from the nozzles to attenuate the filaments, and an air stream vibrating mechanism for periodically changing the direction of the high-speed air stream in the machine direction of the conveyor.
    Type: Grant
    Filed: August 24, 2000
    Date of Patent: February 25, 2003
    Assignees: Nippon Petrochemicals Co., Ltd., Polymer Processing Research Institute Ltd.
    Inventors: Yuki Kuroiwa, Kazuhiko Kurihara, Kazuhiro Yabe, Akira Nii, Shin-ichi Umejima
  • Patent number: 6511625
    Abstract: A transversely stretched nonwoven fabric is manufactured by transversely stretching a nonwoven fabric. First, an original web comprising a plurality of un-oriented filaments is heated to a temperature higher than its stretch suitable temperature by 5° C. or more. Next, the heated original web is stretched at a rate of 1.2 to 3 in its transverse direction to stretch the filaments of the original web with almost no molecular orientation involved. Then, the original web stretched transversely at a rate of 1.2 to 3 is heated to the stretch suitable temperature and the original web is further stretched transversely at the stretch suitable temperature. With these steps, a transversely stretched nonwoven fabric in which the original web is stretched transversely at a rate of 7 times or more in total as compared with the state of the stretch thereof is manufactured with a high tensile strength of 132.5 mN/tex (1.5 g/d) in the transverse direction.
    Type: Grant
    Filed: August 23, 2000
    Date of Patent: January 28, 2003
    Assignees: Nippon Petrochemicals Co., Ltd., Polymer Processing Research Institute Ltd.
    Inventors: Yuki Kuroiwa, Yoshiro Morino, Kazuhiko Kurihara, Shuichi Murakami
  • Publication number: 20020158362
    Abstract: An apparatus for manufacturing a transversely aligned web has a spinning device provided with a plurality of nozzles for extruding molten polymer as filaments, and a conveyor on which the filaments spun by the spinning device are piled and traveling in a direction cross to the direction of array of the nozzles. The spinning device is provided with a high-speed fluid blowing unit for blowing a high-speed fluid in a direction parallel with a direction in which the filaments are extruded from the nozzles so as to attenuate the filaments. Further, the apparatus for manufacturing the transversely aligned web has at least one air stream vibrating mechanism for cyclically changing the flowing direction of the high-speed fluid blown from the high-speed fluid blowing unit in a direction cross to the machine direction of the conveyor. The filaments are vibrated in a direction cross to the machine direction of the conveyor, owing to the high-speed fluid by the air stream vibrating unit.
    Type: Application
    Filed: February 26, 2002
    Publication date: October 31, 2002
    Applicant: NIPPON PETROCHEMICALS , CO., LTD.
    Inventors: Yuki Kuroiwa, Kazuhiko Kurihara, Kazuhiro Yabe, Shin-ichi Umejima, Yoshiro Morino
  • Publication number: 20010006866
    Abstract: A multiaxial laminated non-woven fabric is comprised of tows used as a constituent material and overlaid and bonded with one another. The starting material tow has crimps and has total tex of not more than 300,000 and tow-constituting filaments have an average fineness of not more than 3 tex. A three-dimensional moulded products from the multiaxial non-woven fabric is also provided, and a method for stably producing the non-woven tow fabric while ensuring quality comprises subjecting tows multiaxially and obliquely overlaid with one another to bonding treatment, such as needle punching, or heat treatment while they are held by pins of an overlaying machine.
    Type: Application
    Filed: December 26, 2000
    Publication date: July 5, 2001
    Applicant: POLYMER PROCESSING RESEARCH INSTITUTE, LTD.
    Inventors: Yuki Kuroiwa, Kazuhiko Kurihara, Yasuo Sasaki
  • Patent number: 6132661
    Abstract: A longitudinally stretched nonwoven fabric and a method for producing the same, which nonwoven fabric is a web mainly composed of long fiber filaments of 3 .mu.m to 15 .mu.m in diameter and made by short distance stretching in one direction at a stretching ratio of at least 5, and which production method is characterized in the steps of: maintaining the spun filaments in a draftable state; cooling the filaments with a cooling fluid, then guiding the filaments onto a conveyer with inclining the flow of filaments toward the transferring direction, and sucking by a reduced pressure from the back side of said conveyer, and further subjecting the web of filaments to short distance stretching in the longitudinal direction.
    Type: Grant
    Filed: November 17, 1997
    Date of Patent: October 17, 2000
    Assignees: Nippon Petrochemical Company, Limited, Polymer Processing Research Inst., Ltd.
    Inventors: Kazuhiko Kurihara, Hiroshi Yazawa, Shuichi Murakami, Yoichi Mazawa, Yuki Kuroiwa, Yukio Matsumura, Kazuhiro Yabe, Shin'ichi Umejima
  • Patent number: 6048808
    Abstract: The invention provides a nonwoven fabric of stretched filaments of different kind polymers, having a strength equal to that of a woven fabric and features including an elongation, a uniformity, good feeling, a bulkiness and a thinness, characterized in that the nonwoven fabric is provided with stretched filament webs comprising long filaments formed out of a plural kinds of thermoplastic polymers of different properties, the long filaments as a whole being aligned in one direction, and a method for manufacturing the same. The invention provides also a nonwoven fabric of stretched filaments having a high strength as well as a high bulkiness and comprising different kind polymers which is provided with a first web layer of crimped filaments and a second web layer of substantially non-crimped, stretched long filaments, and a method for manufacturing the same.
    Type: Grant
    Filed: July 6, 1998
    Date of Patent: April 11, 2000
    Assignees: Polymer Processing Research Inst., Ltd., Nippon Petrochemicals Company, Ltd.
    Inventors: Kazuhiko Kurihara, Hiroshi Yazawa, Toshikazu Ohishi, Yoichi Mazawa, Yuki Kuroiwa, Shuichi Murakami, Sadayuki Ishiyama, Jun Yamada
  • Patent number: 5840633
    Abstract: The invention provides a nonwoven fabric of stretched filaments of different kind polymers, having a strength equal to that of a woven fabric and features including an elongation, a uniformity, good feeling, a bulkiness and a thinness, characterized in that the nonwoven fabric is provided with stretched filament webs comprising long filaments formed out of a plural kinds of thermoplastic polymers of different properties, the long filaments as a whole being aligned in one direction, and a method for manufacturing the same. The invention provides also a nonwoven fabric of stretched filaments having a high strength as well as a high bulkiness and comprising different kind polymers which is provided with a first web layer of crimped filaments and a second web layer of substantially non-crimped, stretched long filaments, and a method for manufacturing the same.
    Type: Grant
    Filed: September 17, 1996
    Date of Patent: November 24, 1998
    Assignees: Polymer Processing Research Inst., Ltd., Nippon Petrochemicals Company, Ltd.
    Inventors: Kazuhiko Kurihara, Hiroshi Yazawa, Toshikazu Ohishi, Yoichi Mazawa, Yuki Kuroiwa, Shuichi Murakami, Sadayuki Ishiyama, Jun Yamada
  • Patent number: 5791030
    Abstract: A relatively inexpensive web widening apparatus which is suitable for the manufacture of a widened web having a large width and a lightweight web while maintaining a high widening ratio and the uniformity of the web and can be operated with ease at a high efficiency comprises a widening tool in contact with the web, having first and second groups of widening plates arranged in a width direction of the web to face each other, at least one pair of cross guiders which can nip both side end portions of the web, and guide means for moving the widening plates of the first and second groups in such a manner that the interval between the widening plates expands gradually as they rotate and then narrows gradually.
    Type: Grant
    Filed: August 25, 1997
    Date of Patent: August 11, 1998
    Assignee: Nippon Petrochemicals Co., Ltd.
    Inventors: Kintaro Aihara, Kazuhiko Kurihara, Hiroshi Yazawa, Yuki Kuroiwa, Shuichi Murakami
  • Patent number: 5729878
    Abstract: A web spreading apparatus for transversely spreading a web, such as a split web formed of a longitudinally uniaxially stretched film, includes a spreading means arranged in a travelling path of the web for transversely spreading the web. The spreading means comprises a curved rod-like member and projections arranged generally circumferentially about an axis of the curved rod-like member. The curved rod-like member is arranged so that the concave side is directed forward and the convex side is directed rearward, in the web travelling direction, and the projections are rotatable about the axis of the curved rod-like member at a speed higher than the travelling speed of the web. In one aspect, the curved rod-like member comprises a curved shaft and an outer tube arranged about the curved shaft and rotatable relative to the curved shaft, the projections being formed between the grooves cut on the outer tube. In another aspect, the projections are formed of a spring arranged about the curved rod-like member.
    Type: Grant
    Filed: March 31, 1997
    Date of Patent: March 24, 1998
    Assignees: Nippon Petrochemicals Company, Limited, Polymer Processing Research Instr., Ltd.
    Inventors: Kazuhiko Kurihara, Hiroshi Yazawa, Yuki Kuroiwa, Shuichi Murakami
  • Patent number: 5382773
    Abstract: An apparatus for fabricating a perforated web comprising an endless masking plate arranged above a continuously conveyed web. The masking plate has a plurality of apertures arranged in a predetermined pattern, the masking plate being adapted so as to be continuously circulated. The light is irradiated to the web via the masking plate so that apertures or slits are formed in the web corresponding to the apertures of the masking plate. The light may be a laser, an infrared light, or an ultraviolet light, and the light from the source is diverged transversely about the web and converged longitudinally about the web.
    Type: Grant
    Filed: December 24, 1992
    Date of Patent: January 17, 1995
    Assignees: Nippon Petrochemicals Company, Limited, Polymer Processing Research Institute, Ltd.
    Inventors: Kazuhiko Kurihara, Hiroshi Yazawa, Shoichi Yazawa, Yuki Kuroiwa, Shuichi Murakami
  • Patent number: 4411722
    Abstract: A process for producing a non-woven fabric of cross-laminated warp web and weft webs is provided, which comprises first preparing the weft webs by ejecting a molten polymer of specified properties through orifices provided on the peripheral surface of a rotating vessel, in the lateral direction of the vessel and toward elongated stocks arranged in parallel and in cylindrical form and running around the vessel vertically in the direction of the polymer ejection; causing the ejected polymer to form adhesive filaments adhered onto the stocks to thereby fix the arrangement of the stocks; cutting open the resulting web and cutting the cut-open web by a length corresponding to a width of the above cross-laminated product; successively placing the cut webs onto the above warp web without gaps; and melting the adhesive filaments constituting the weft webs by heating the laminate to thereby bond the cross-points of the weft webs and the warp web to obtain the above product.
    Type: Grant
    Filed: July 2, 1981
    Date of Patent: October 25, 1983
    Assignee: Polymer Processing Research Institute Ltd.
    Inventors: Masahide Yazawa, deceased, by Hiroshi Yazawa, executor, Kazuhiko Kurihara, Hiroshi Yazawa, Yuki Kuroiwa, Shuichi Murakami