Patents by Inventor Fumio Kokai

Fumio Kokai 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).

  • Nano-graphite spherical material and method for preparation thereof
    Publication number: 20050079354
    Abstract: A graphite nanosphere which has a structure wherein a plurality of pyramids of multilayer graphite are arranged without clearance, taking their apexes as a center and the external form thereof is nearly spherical as a whole or as a part; and a method for preparing the graphite nanosphere which comprises irradiating a carbon target with a CO2 laser in an inert gas atmosphere under a pressure of 5 to 10 atm to thereby generate the carbon in an atomic or cluster form having a temperature of no less than 1000° C.
    Type: Application
    Filed: December 19, 2002
    Publication date: April 14, 2005
    Inventors: Sumio Iijima, Masako Yudasaka, Fumio Kokai, Kunimitsu Takahashi
  • Carbon nano-horn and method for preparation thereof
    Publication number: 20040241445
    Abstract: A particular material comprising an atom other than carbon is carried around or inside the carbon nanohorn.
    Type: Application
    Filed: July 6, 2004
    Publication date: December 2, 2004
    Inventors: Masako Yudasaka, Sumio Iijima, Fumio Kokai, Kunimitsu Takahashi, Daisuke Kasuya
  • Carbon nanohorn adsorbent and process for producing the same
    Publication number: 20040048744
    Abstract: A novel carbon nanohorn adsorbent which does not necessitate a high-temperature treatments lightweight and chemically stable, and can selectively adsorb molecules based on the molecular sieve effect; and a process for producing the adsorbent. The process comprises oxidizing a single-wall carbon nanohorn aggregate while controlling oxidative conditions to thereby obtain the carbon nanohorn adsorbent, which have, in the tubular parts, pores having a regulated diameter.
    Type: Application
    Filed: October 6, 2003
    Publication date: March 11, 2004
    Inventors: Sumio Iijima, Masako Yudasaka, Fumio Kokai, Kunimitsu Takahashi, Daisuke Kasuya, Katsumi Kaneko, Katsuyuki Murata
  • Magnetic recording medium and production of the same
    Patent number: 4755426
    Abstract: A magnetic recording medium which comprises a substrate, a magnetic layer on the substrate and a protective layer which is formed directly on the magnetic layer or on an undercoat layer formed on the magnetic layer, the protective layer comprising a carbonaceous material essentially consisting of carbon, hydrogen and oxygen, which has improved traveling properties and abrasion resistance.
    Type: Grant
    Filed: January 14, 1987
    Date of Patent: July 5, 1988
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Fumio Kokai, Minoru Ichijo, Kunio Wakai
  • Magnetic recording medium and production thereof
    Patent number: 4737415
    Abstract: A magnetic recording medium comprising a substrate, a magnetic layer and a protective layer which consists of an organic polymeric material comprising carbon atoms, hydrogen atoms and oxygen atoms, the content of the oxygen atoms increasing towards the outer surface of the protective layer, which has improved durability and corrosion resistance.
    Type: Grant
    Filed: November 20, 1985
    Date of Patent: April 12, 1988
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Minoru Ichijo, Tsunemi Ohiwa, Fumio Kokai, Takashi Kubota, Kunio Wakai