Patents by Inventor Syoji Sakaguchi

Syoji Sakaguchi 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).

  • Substrate for magnetic recording media using dried thermoplastic norbornene resin and magnetic recording media using substrate
    Patent number: 7147944
    Abstract: The gas components in thermoplastic norbornene resin pellets are suppressed below certain levels by drying the resin under vacuum or under the ordinary pressure and under vacuum. A substrate for magnetic recording media is manufactured by injection-molding the resin dried by the method according to the invention. The magnetic recording medium, employing the substrate manufactured according to the invention, includes at least a magnetic layer, a protection layer on the magnetic layer and a liquid lubricant layer on the protection layer. The magnetic recording medium is manufactured by forming these layers, one after another, on the substrate according to the invention.
    Type: Grant
    Filed: February 20, 2004
    Date of Patent: December 12, 2006
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Youich Tei, Syoji Sakaguchi, Katsunori Suzuki
  • Magnetic recording medium substrate using thermoplastic allyloxymethylstyrene resin, magnetic recording medium using the substrate, and method of manufacturing the magnetic recording medium
    Patent number: 6939595
    Abstract: An injection molded thermoplastic magnetic recording substrate a medium formed therewith, and a method thereof is composed of a thermoplastic or allyloxymethylstyrene type resin.
    Type: Grant
    Filed: November 13, 2003
    Date of Patent: September 6, 2005
    Assignee: Fuji Electric Device Technology Co., Ltd.
    Inventors: Youichi Tei, Kouichi Tsuda, Ryoji Kobayashi, Syoji Sakaguchi
  • Method for purifying a thermoplastic norbornene resin, a substrate using such a resin, and a magnetic recording medium using such a substrate
    Patent number: 6794488
    Abstract: A thermoplastic norbornene resin is purified by using a cleaning liquid to eliminate organic impurities, ionic impurities, metallic impurities, and particles of the resin. The cleaning liquid is selected from 2-propanol and a mixed solvent of 2-propanol and water. A substrate for a magnetic recording medium of the invention is fabricated by injection-molding the thermoplastic norbornene resin purified by this method. A magnetic recording medium of the invention includes such a substrate, and a magnetic layer, a protective layer, and a liquid lubricant layer sequentially formed on the substrate. A method for manufacturing such a magnetic recording medium is also provided.
    Type: Grant
    Filed: April 6, 2001
    Date of Patent: September 21, 2004
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Youich Tei, Syoji Sakaguchi, Katsunori Suzuki
  • Method of drying thermoplastic norbornene resin, and method of manufacturing magnetic recording medium
    Publication number: 20040163273
    Abstract: The gas components in thermoplastic norbornene resin pellets are suppressed below certain levels by drying the resin under vacuum or under the ordinary pressure and under vacuum. A substrate for magnetic recording media is manufactured by injection-molding the resin dried by the method according to the invention. The magnetic recording medium, employing the substrate manufactured according to the invention, includes at least a magnetic layer, a protection layer on the magnetic layer and a liquid lubricant layer on the protection layer. The magnetic recording medium is manufactured by forming these layers, one after another, on the substrate according to the invention.
    Type: Application
    Filed: February 20, 2004
    Publication date: August 26, 2004
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventors: Youichi Tei, Syoji Sakaguchi, Katsunori Suzuki
  • Magnetic recording medium substrate using thermoplastic allyloxymethylstyrene resin, magnetic recording medium using the substrate, and method of manufacturing the magnetic recording medium
    Publication number: 20040151948
    Abstract: An injection molded thermoplastic magnetic recording substrate a medium formed therewith, and a method thereof is composed of a thermoplastic or allyloxymethylstyrene type resin.
    Type: Application
    Filed: November 13, 2003
    Publication date: August 5, 2004
    Inventors: Youichi Tei, Kouichi Tsuda, Ryoji Kobayashi, Syoji Sakaguchi
  • Method for purifying a thermoplastic norbornene resin, a substrate using such a resin, and a magnetic recording medium using such a substrate
    Patent number: 6743530
    Abstract: A thermoplastic norbornene resin is purified by using a cleaning liquid to eliminate organic impurities, ionic impurities, metallic impurities, and particles of the resin. The cleaning liquid is selected from 2-propanol and a mixed solvent of 2-propanol and water. A substrate for a magnetic recording medium of the invention by fabricated by injection-molding the thermoplastic norbornene resin purified by this method. A magnetic recording medium of the invention includes such a substrate, and a magnetic layer, a protective layer, and a liquid lubricant layer sequentially formed on the substrate. A method for manufacturing such a magnetic recording medium is also provided.
    Type: Grant
    Filed: April 10, 2003
    Date of Patent: June 1, 2004
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Youich Tei, Syoji Sakaguchi, Katsunori Suzuki
  • Method of drying thermoplastic norbornene resin and method of manufacturing magnetic recording medium
    Patent number: 6722057
    Abstract: The gas components in thermoplastic norbornene resin pellets are suppressed below certain levels by drying the resin under vacuum or under the ordinary pressure and under vacuum. A substrate for magnetic recording media is manufactured by injection-molding the resin dried by the method according to the invention. The magnetic recording medium, employing the substrate manufactured according to the invention, includes at least a magnetic layer, a protection layer on the magnetic layer and a liquid lubricant layer on the protection layer. The magnetic recording medium is manufactured by forming these layers, one after another, on the substrate according to the invention.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: April 20, 2004
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Youich Tei, Syoji Sakaguchi, Katsunori Suzuki
  • Method for purifying a thermoplastic norbornene resin, a substrate using such a resin, and a magnetic recording medium using such a substrate
    Publication number: 20030208017
    Abstract: A thermoplastic norbornene resin is purified by using a cleaning liquid to eliminate organic impurities, ionic impurities, metallic impurities, and particles of the resin. The cleaning liquid is selected from 2-propanol and a mixed solvent of 2-porpanol and water. A subtrate for a magnetic recording medium of the invention is fabricated by injection-molding the thermoplastic norbornene resin purified by this method. A magnetic recording medium of the invention includes such a subtrate, and a magnetic layer, protective layer, and a liquid lubricant layer sequentially formed on the subtrate. A method for manufacturing such a magnetic recording medium is also provided.
    Type: Application
    Filed: April 10, 2003
    Publication date: November 6, 2003
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventors: Youich Tei, Syoji Sakaguchi, Katsunori Suzuki
  • Method for purifying a thermoplastic norbornene resin, a substrate using such a resin, and a magnetic recording medium using such a substrate
    Publication number: 20030204048
    Abstract: A thermoplastic norbornene resin is purified by using a cleaning liquid to eliminate organic impurities, ionic impurities, metallic impurities, and particles of the resin. The cleaning liquid is selected from 2-propanol and a mixed solvent of 2-propanol and water. A substrate for a magnetic recording medium of the invention is fabricated by injection-molding the thermoplastic norbornene resin purified by this method. A magnetic recording medium of the invention includes such substrate, and a magnetic layer, a protective layer, and a liquid lubricant layer sequentially formed on the substrate. A method for manufacturing such a magnetic recording medium is also provided.
    Type: Application
    Filed: April 10, 2003
    Publication date: October 30, 2003
    Applicant: FUJI ELECTRIC CO. , LTD.
    Inventors: Youich Tei, Syoji Sakaguchi, Katsunori Suzuki
  • Method of drying thermoplastic norbornene resin, the substrate for magnetic recording media using the thermoplastic norbornene resin, the magnetic recording medium using the substrate, and the method of manufacturing the magnetic recording medium
    Publication number: 20020034664
    Abstract: The gas components in thermoplastic norbomene resin pellets are suppressed below certain levels by drying the resin under vacuum or under the ordinary pressure and under vacuum. A substrate for magnetic recording media is manufactured by injection-molding the resin dried by the method according to the invention. The magnetic recording medium, employing the substrate manufactured according to the invention, includes at least a magnetic layer, a protection layer on the magnetic layer and a liquid lubricant layer on the protection layer. The magnetic recording medium is manufactured by forming these layers, one after another, on the substrate according to the invention.
    Type: Application
    Filed: July 25, 2001
    Publication date: March 21, 2002
    Inventors: Youich Tei, Syoji Sakaguchi, Katsunori Suzuki
  • Method for purifying a thermoplastic norbornene resin, a substrate using such a resin, and a magnetic recording medium using such a substrate
    Publication number: 20010056051
    Abstract: A thermoplastic norbornene resin is purified by using a cleaning liquid to eliminate organic impurities, ionic impurities, metallic impurities, and particles of the resin. The cleaning liquid is selected from 2-propanol and a mixed solvent of 2-propanol and water. A substrate for a magnetic recording medium of the invention is fabricated by injection-molding the thermoplastic norbornene resin purified by this method. A magnetic recording medium of the invention includes such a substrate, and a magnetic layer, a protective layer, and a liquid lubricant layer sequentially formed on the substrate. A method for manufacturing such a magnetic recording medium is also provided.
    Type: Application
    Filed: April 6, 2001
    Publication date: December 27, 2001
    Inventors: Youich Tei, Syoji Sakaguchi, Katsunori Suzuki