Patents by Inventor Sadamu Kuse

Sadamu Kuse 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 tape cartridge
    Patent number: 5725943
    Abstract: A magnetic tape cartridge comprising a magnetic tape suitable for long time recording which has a coefficient of thermal shrinkage of 0.6% or less the coefficient being measured after the tape is wound around a hub at least 300 turns and kept at 105.degree. C. for 30 minutes.
    Type: Grant
    Filed: April 4, 1994
    Date of Patent: March 10, 1998
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Junichi Hirata, Sadamu Kuse, Seigi Kawarai
  • Magnetic recording tape containing low levels of compounds with molecular weights between specified limits determined from gel permeation chromatography of tape extract
    Patent number: 5051319
    Abstract: A magnetic recording tape comprising a non-magnetic substrate, a magnetic layer which comprises magnetic powder and a binder resin coated on one surface of the substrate and a back coating layer which comprises non-magnetic powder and a binder resin coated on the other surface of the substrate, wherein an amount of compounds having a molecular weight of 1000 to 5000, as converted to polystyrene molecular weight, extracted with tetrahydrofuran and converted to a polystyrene extraction amount, per 3 .mu.m thickness from the magnetic layer (W.sub.M) and per 1 .mu.m thickness of from the back coating layer (W.sub.B), are both less than 200 mg/m.sup.2, which tape has improved traveling stability and durability.
    Type: Grant
    Filed: February 9, 1990
    Date of Patent: September 24, 1991
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Sadamu Kuse, Kimihiko Kaneno, Seigi Kawarai
  • Magnetic recording medium including magnetic metallic powder
    Patent number: 5035947
    Abstract: A magnetic metallic powder comprising metal iron, at least 0.1% by weight of manganese based on the weight of metal iron and at least one alkaline earth metal in an amount 1 to 50 times the weight of manganese and a magnetic recording medium having a magnetic layer comprising the magnetic metallic powder, which magnetic layer has improved durability as well as improved magnetic characteristics and electromagnetic conversion characteristics.
    Type: Grant
    Filed: January 19, 1989
    Date of Patent: July 30, 1991
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Seigi Kawarai, Sadamu Kuse, Yasushi Orita
  • Magnetic recording medium
    Patent number: 4774147
    Abstract: A magnetic recording medium having an excellent electromagnetic property with low frictional magnetic layer surface which comprises a base material having a magnetic layer provided thereon, said magnetic layer comprising magnetic powder, a resinous binder and graphitized carbon black powder, and optionally, with non-graphitized carbon black powder.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: September 27, 1988
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Sadamu Kuse, Seigi Kawarai
  • Magnetic recording medium
    Patent number: 4632867
    Abstract: A magnetic recording medium having an excellent electromagnetic property with a low frictional magnetic layer surface which comprises a base material and a magnetic layer provided thereon, said magnetic layer comprising magnetic powder, a resinous binder and graphitized carbon black powder, optionally with non-graphitized carbon black powder.
    Type: Grant
    Filed: July 8, 1985
    Date of Patent: December 30, 1986
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Sadamu Kuse, Seigi Kawarai