Patents by Inventor Hitoshi Azegami

Hitoshi Azegami 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).

  • Magnetic recording medium
    Patent number: 4414288
    Abstract: A magnetic recording medium which comprises a substrate coated with a magnetic paint which has a magnetic powder dispersed in a binder comprising a vinyl chloride - vinyl acetate copolymer containing at least 10% of polyvinyl alcohol, a urethane resin and a polyester resin.
    Type: Grant
    Filed: March 29, 1982
    Date of Patent: November 8, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Hiroshi Kawahara, Hitoshi Azegami, Eiji Horigome
  • Magnetic recording medium
    Patent number: 4410590
    Abstract: A magnetic recording medium comprises a lower magnetic layer containing a magnetic powder having a coercive force of 700 Oe or higher dispersed in an organic binder which is coated on a non-magnetic substrate and an upper magnetic layer containing a magnetic powder having a coercive force higher than the coercive force of said lower magnetic la
    Type: Grant
    Filed: October 14, 1981
    Date of Patent: October 18, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Hiroshi Kawahara, Hitoshi Azegami, Eiji Horigome
  • Magnetic recording medium
    Patent number: 4400435
    Abstract: A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder and a binder comprising an urethane resin and a vinyl chloride-vinyl acetate-maleic acid copolymer having a content of maleic acid component of at least 1.5%.
    Type: Grant
    Filed: July 15, 1981
    Date of Patent: August 23, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Kuniichi Yoda, Takehisa Ohkawa, Hitoshi Azegami
  • Magnetic recording medium
    Patent number: 4391877
    Abstract: A magnetic recording medium including a substrate having a magnetic coating layer thereon, said magnetic coating layer comprising ferromagnetic particles dispersed in a binder vehicle, characterized in that the magnetic coating layer contains one or more ketones selected from the compounds expressed by the general formula ##STR1## wherein R.sub.1 and R.sub.2 represent saturated or unsaturated chain aliphatic radicals, both or either of which have 11 to 22 carbon atoms and may contain hydroxyl, carboxyl or amino groups.
    Type: Grant
    Filed: March 18, 1982
    Date of Patent: July 5, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Fujio Shibata, Hiroshi Kawahara, Hitoshi Azegami
  • Magnetic tape cassette
    Patent number: 4380035
    Abstract: A magnetic tape cassette comprises a pad support membrane made of a metal alloy such as bronze and nickel silver. The pad support membrane is coated with a synthetic resin layer containing a rust inhibitor.
    Type: Grant
    Filed: September 4, 1980
    Date of Patent: April 12, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Hiroshi Ota, Eiji Horigome, Hitoshi Azegami
  • Lubricant sheet for magnetic tape cassette
    Patent number: 4376519
    Abstract: A lubricant sheet for a magnetic tape cassette characterized in that at least one side of a base incorporating an antistatic agent is provided with a release type silicone coating. This lubricant sheet combines the transparency derived from the use of the clear base and coating materials with the low friction characteristic and the antistatic property to suit the application as such for transparent tape cassette cases.
    Type: Grant
    Filed: June 9, 1981
    Date of Patent: March 15, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Toshihiko Ishida, Hitoshi Azegami, Yoshio Kawakami
  • Magnetic recording medium
    Patent number: 4352859
    Abstract: A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder and a binder comprising an urethane resin or a polyester and a vinyl chloride type copolymer of vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer or vinyl chloride-vinylidene chloride copolymer having a polymerization degree of up to 300.
    Type: Grant
    Filed: July 20, 1981
    Date of Patent: October 5, 1982
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Kuniichi Yoda, Takehisa Ohkawa, Hitoshi Azegami
  • Magnetic recording medium
    Patent number: 4340644
    Abstract: A magnetic recording medium consisting of a base coated with magnetic coating material which is a dispersion of magnetic particles using a vinyl chloride-vinyl acetate copolymer and a polyester resin as binder, characterized by the addition of a vinyl chloride-vinyl acetate copolymer containing at least 10% of vinyl alcohol. The use of the last-mentioned copolymer improves the frequency response characteristic as well as the mechanical properties such as the running quality.
    Type: Grant
    Filed: November 19, 1979
    Date of Patent: July 20, 1982
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Hiroshi Ota, Eiji Horigome, Hitoshi Azegami
  • Magnetic recording medium
    Patent number: 4315057
    Abstract: A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder and a binder and a rust inhibitor at a ratio of more than 0.1 wt. % based on resins of the binder.
    Type: Grant
    Filed: October 1, 1980
    Date of Patent: February 9, 1982
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Eiji Horigome, Hitoshi Azegami, Hiroshi Ohta
  • Magnetic recording medium
    Patent number: 4305995
    Abstract: A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder, a thermosettable binder and a mixture of sorbitane mono-, di- and tri- higher fatty acid ester surfactants.
    Type: Grant
    Filed: August 5, 1980
    Date of Patent: December 15, 1981
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Hiroshi Ota, Eiji Horigome, Hitoshi Azegami
  • Magnetic recording medium
    Patent number: 4291100
    Abstract: A magnetic recording medium comprises a substrate coated with a magnetic layer wherein a magnetic powder is orientated in a binder and a polyoxyethylenesorbitane higher fatty acid ester surfactant.
    Type: Grant
    Filed: June 20, 1980
    Date of Patent: September 22, 1981
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Eiji Horigome, Hiroshi Ota, Hitoshi Azegami
  • Magnetic recording medium and process
    Patent number: 4289828
    Abstract: A magnetic recording medium made by coating a base with a magnetic coating material which is a dispersion of magnetic particles in a binder of synthetic resins using a polyfunctional aromatic isocyanate as a curing agent, characterized by the addition of a sorbitan stearate type surface active agent which has a sorbitol derivative in the hydrophilic group. The present magnetic recording medium has superior mechanical properties, especially a superior running quality as well as superior electromagnetic properties.
    Type: Grant
    Filed: November 28, 1979
    Date of Patent: September 15, 1981
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Hiroshi Ota, Eiji Horigome, Hitoshi Azegami
  • Magnetic recording medium
    Patent number: 4234438
    Abstract: A magnetic recording medium comprises a substrate coated with a magnetic coating composition comprising nitrocellulose impregnated with a vinyl chloride-vinyl acetate-vinyl alcohol copolymer having a content of vinyl alcohol component of 8 wt. % or more, a magnetic powder, a solvent, and a thermal crosslinking agent.
    Type: Grant
    Filed: May 10, 1979
    Date of Patent: November 18, 1980
    Assignee: TDK Electronics Company Limited
    Inventors: Eiji Horigome, Hiroshi Ota, Hitoshi Azegami