Patents by Inventor Masako Yudasaka

Masako Yudasaka 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: 20060193919
    Abstract: The present invention provides a carbon nanohorn complex that is excellent in characteristics of adsorption or inclusion of drugs and release, in particular, a sustained release of drugs as a novel drug carrier in drug delivery systems, as well as a process for producing the complex. The complex of drug and carbon nanohorns comprises a steroidal or metal-containing drug being adsorbed onto the oxidized carbon nanohorns, or included in pores opened thereof.
    Type: Application
    Filed: August 29, 2005
    Publication date: August 31, 2006
    Inventors: Sumio Iijima, Masako Yudasaka, Kumiko Ajima, Tatsuya Murakami, Kiyotaka Shiba
  • Publication number: 20060165992
    Abstract: A single walled carbon nanohorn adsorptive material which comprises a single walled carbon nanohorn and a lanthanide metal deposited thereon and has methane adsorptivity is produced, whereby a single walled carbon nanohorn adsorptive material which can adsorb much methane and is effective as a methane adsorbing material is provided.
    Type: Application
    Filed: May 31, 2004
    Publication date: July 27, 2006
    Applicants: JAPAN TECHNOLOGY AGENCY, NEC CORPORATION
    Inventors: Sumio Iijima, Katsuyuki Murata, Katsumi Kaneko, Masako Yudasaka
  • Publication number: 20060147647
    Abstract: Nanocarbon is produced stably in a large amount. In a production chamber (107), a graphite rod (101) having a cylindrical shape is fixed to a rotation apparatus (115) and is made capable of rotating with its axis being in the length direction of the graphite rod (101) and movable to the right or the left in the length direction. A side surface of the graphite rod (101) is irradiated with a laser beam (103) from a laser light source (111). A nanocarbon collecting chamber (119) is disposed in the direction of generation of plumes (109) so as to collect the generated carbon nanohorn aggregates 117.
    Type: Application
    Filed: February 10, 2004
    Publication date: July 6, 2006
    Inventors: Takeshi Azami, Takashi Manako, Tsutomu Yoshitake, Yoshimi Kubo, Sumio Iijima, Masako Yudasaka, Daisuke Kasuya
  • Patent number: 7067096
    Abstract: A novel carbon nanotube-carbon nanohorn complex produced by a method comprising step 1 for irradiating carbon nanotube placed in a liquid solvent with ultrasonic wave to disperse carbon nanotube into the liquid solvent, and step 2 for adding carbon nanohorn aggregate to the liquid solvent dispersed with carbon nanotube to thus remove the liquid solvent, whereby the surface of the carbon nanotube and the carbon nanohorn aggregate can be utilized more effectively and the availability can be enlarged.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: June 27, 2006
    Assignees: Japan Science and Technology Agency, NEC Corporation
    Inventors: Sumio Iijima, Masako Yudasaka, Akira Koshio
  • Publication number: 20060133979
    Abstract: A production method and a production apparatus for stable mass production of nanocarbon are provided. In a production chamber (107), a graphite rod (101) having a cylindrical shape is fixed to a rotation apparatus (115), and is made to be capable of rotating with the length direction of the graphite rod (101) serving as an axis, and also moving to the right or the left in the length direction. The side surface of the graphite rod (101) is irradiated with a laser beam (103) from a laser light source (111), and a nanocarbon collecting chamber (119) is disposed in the direction of generation of plumes (109). On the other hand, the surface irradiated with the laser beam (103) among the side surfaces of the graphite rod (101) is speedily rotated by the rotation apparatus (115) and is flattened by a cutting tool (105). Cut dusts of the graphite rod (101) generated by the cutting tool (105) are collected into a cut graphite collecting chamber (121) and separated from the generated carbon nanohorn aggregates (117).
    Type: Application
    Filed: February 10, 2004
    Publication date: June 22, 2006
    Inventors: Takeshi Azami, Takashi Manako, Tsutomu Yoshitake, Yoshimi Kubo, Sumio Iijima, Masako Yudasaka, Daisuke Kasuya
  • Publication number: 20060013758
    Abstract: A method for selectively obtaining carbon nanotubes having specific structures by selectively obtaining carbon nanotubes having structures different from the structures of the carbon nanotubes to be vanished by irradiating carbon nanotubes with a light beam of single wavelength so as to have carbon nanotubes in specific electron states in the excited states, and oxidizing and combusting the carbon nanotubes in the excited states by an oxygen or an oxidizing agent so as to vanish the same.
    Type: Application
    Filed: April 1, 2003
    Publication date: January 19, 2006
    Inventors: Sumio Iijima, Masako Yudasaka, Minfang Zhang
  • Publication number: 20050284296
    Abstract: The invention relates to a new self-locking carbon adsorbent comprising a carbon nanohorn aggregate provided with an opening in the wall part thereof, wherein a substance to be adsorbed passes through the opening in one limited direction from the outside to inside of the carbon nanohorn in isothermal or isobaric adsorption, whereby the self-blocking carbon adsorbent is made to be useful, for example, for storing methane gas and can store various gases at room temperature at a high density.
    Type: Application
    Filed: August 5, 2002
    Publication date: December 29, 2005
    Inventors: Sumio IIjima, Masako Yudasaka, Katsuyuki Murata, Katsumi Kaneko, Daisuke Kasuya
  • Publication number: 20050271807
    Abstract: The objects of this patent application are to provide a new nano-extraction method for guest molecules to be incorporated into single-wall carbon nanotube (SWNT) comprising: putting guest molecules in solvent, wherein the guest molecules have a poor affinity to the solvent and a strong affinity to single-wall carbon nanotube (SWNT) and the attractive force between the guest molecules and SWNT is greater than that between the guest molecules and solvent molecules and that between the solvent molecules and SWNT, ultrasonicating the solution including the solvent and quest molecules, adding single-wall carbon nanotube (SWNT) or single-wall carbon nanotubes (SWNTs) with opened tips and wall-holes in the solution, and leaving the SWNT-guest molecules-solvent mixture until becoming stable with the guest molecules incorporated into SWNT at room temperature, and a nano-condensation method for guest molecules to be incorporated into single-wall carbon nanotube (SWNT) comprising: dropping saturated solution including s
    Type: Application
    Filed: July 22, 2004
    Publication date: December 8, 2005
    Inventors: Sumio Iljima, Kumiko Ajima, Masako Yudasaka
  • Patent number: 6967043
    Abstract: A method of manufacturing, with high purity and high efficiency, a multi-wall carbon nanotube (10) having layers densely fitted to the center part thereof, comprising the step of leading a graphite rod (2) into plasma flame (1) generated in the atmosphere of inert gas (4) added with hydrogen to evaporate carbon so as to stack the densest multi-wall carbon nanotube (10) on the surface of the graphite rod (2).
    Type: Grant
    Filed: November 5, 2002
    Date of Patent: November 22, 2005
    Assignees: Japan Science and Technology Agency, NEC Corporation
    Inventors: Sumio Iijima, Masako Yudasaka, Akira Koshio
  • Publication number: 20050158462
    Abstract: A nano horn carrier capable of effectively and conveniently utilizing the tip shape of a carbon nano horn and a method of manufacturing the carrier, the carrier wherein carbon nano horn aggregates (1) are dispersed in dispersion liquid, the dispersion liquid is fed onto a base material (3) and only the dispersion liquid is removed to dispose the carbon nano horn aggregates (1) thereon and a part of all of the carbon nano horn aggregates (1) are covered by fixing material (2) to carry on the fixing material (2), whereby the part or all of the carbon nano horn aggregates (1) can be carried on the fixing material (2).
    Type: Application
    Filed: February 21, 2003
    Publication date: July 21, 2005
    Applicants: Japan Science and Technology Agency, NEC Corporation
    Inventors: Sumio Iijima, Masako Yudasaka
  • Publication number: 20050116602
    Abstract: A novel field electron emitting device characterized in that a main portion of an electron emitting source for emitting electrons by an electric field is made of a carbon nanohorn. The field electron emitting device is high in electron emitting efficiency and excellent in productivity.
    Type: Application
    Filed: November 15, 2001
    Publication date: June 2, 2005
    Inventors: Sumio Iijima, Masako Yudasaka, Forro Laszlo, Garaj Slaven, J.-M. Bonard
  • Publication number: 20050106093
    Abstract: A combination of a metal-based catalyst having a function as a catalyst for formation of graphite and a single-crystal substrate having a certain correspondence to the metal-based catalyst with respect to the crystal grain size and the crystal orientation thereof is used; the metal-based catalyst is dispersed on the single-crystal substrate; and a carbon material is fed to the substrate at any temperature not lower than 500° C. to thereby form single single-walled carbon nanotubes through vapor phase thermal decomposition growth on the substrate. More precisely, the invention of this application enables production of single-walled carbon nanotubes with controlled diameter, requiring neither a porous material nor catalyst particles for use as a catalyst carrier. One example of the combination of the metal-based catalyst and the single-crystal substrate is a combination of Fe and sapphire substrate.
    Type: Application
    Filed: March 27, 2003
    Publication date: May 19, 2005
    Applicants: JAPAN SCIENCE AND TECHNOLOGY AGENCY, NEC Corporation
    Inventors: Sumio Iijima, Masako Yudasaka, Hiroo Hongo
  • 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
  • Publication number: 20050037150
    Abstract: A method of manufacturing a acute tip, multi-wall carbon nanotube radial aggregate, comprising the steps of leading a graphite rod into plasma flame generated in a hydrogen-added inert gas atmosphere to evaporate carbon from the graphite rod and stacking, on the surface of the graphite rod, the acute tip, multi-wall carbon nanotube radial aggregation of novel carbon nano-structure useful as field emission electron sources such as probes for STM and APM, display elements, and displays.
    Type: Application
    Filed: November 5, 2002
    Publication date: February 17, 2005
    Inventors: Sumio Iijima, Masako Yudasaka, Akira Koshio
  • Publication number: 20050031525
    Abstract: A novel carbon nanotube-carbon nanohorn complex produced by a method comprising step 1 for irradiating carbon nanotube placed in a liquid solvent with ultrasonic wave to disperse carbon nanotube into the liquid solvent, and step 2 for adding carbon nanohorn aggregate to the liquid solvent dispersed with carbon nanotube to thus remove the liquid solvent, whereby the surface of the carbon nanotube and the carbon nanohorn aggregate can be utilized more effectively and the availability can be enlarged.
    Type: Application
    Filed: September 17, 2002
    Publication date: February 10, 2005
    Inventors: Sumio Iijima, Masako Yudasaka, Akira Koshio
  • Publication number: 20050013935
    Abstract: The object of the present invention is to provide a pattern-arranged carbon nano material structure applicable of evaluation of properties of materials and a variety of application such as field emission display, gas storage, biological recognition, drug delivery and the like, and a manufacturing method thereof. The structure is constituted so that carbon nano material is secured to aromatic polycyclic molecule fixed on a substrate surface and cation with a graphite structure in a single layer and also in a specific pattern arrangement.
    Type: Application
    Filed: July 16, 2004
    Publication date: January 20, 2005
    Inventors: Sumio Iijima, Zhu Jin, Zhang Minfang, Masako Yudasaka
  • Publication number: 20040265491
    Abstract: A method of manufacturing, with high purity and high efficiency, a multi-wall carbon nanotube (10) having layers densely fitted to the center part thereof, comprising the step of leading a graphite rod (2) into plasma flame (1) generated in the atmosphere of inert gas (4) added with hydrogen to evaporate carbon so as to stack the densest multi-wall carbon nanotube (10) on the surface of the graphite rod (2).
    Type: Application
    Filed: July 7, 2004
    Publication date: December 30, 2004
    Inventors: Sumio Iijima, Masako Yudasaka, Akira Koshio
  • Publication number: 20040252442
    Abstract: An electric double-layer capacitor comprises a carbon composite electrode which serves as a polarizing electrode (31) and made of a single-layer carbon nanohorn aggregate having a specific structure and a very large surface area. The single carbon nanohorn aggregate is mixed with a phenol resin, the mixture is formed and heated to produce a carbon composite electrode. The carbon composite electrode is impregnated with an electrolyte to become a polarizing electrode. An electric double-layer capacitor comprising this polarizing electrode has a large capacitance and is capable of discharging with large current.
    Type: Application
    Filed: March 26, 2004
    Publication date: December 16, 2004
    Inventors: Tsutomu Yoshitake, Sumio Iijima, Masako Yudasaka
  • 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
  • Publication number: 20040234841
    Abstract: A solid polymer electrolyte-catalyst combined electrode which comprises a solid polymer electrolyte and carbon particles carrying a catalytic material. The solid polymer fuel cell electrode contains carbon particles which are monolayer carbon nano-horn aggregates. The monolayer carbon nano-horns are made up of monolayer carbon nano-tubes of a specific structures each having a conical shape at one end, and are aggregated spherically. A solid polymer fuel cell using the electrode is also provided.
    Type: Application
    Filed: July 9, 2004
    Publication date: November 25, 2004
    Inventors: Tsutomu Yoshitake, Yoshimi Kubo, Sumio Iijima, Masako Yudasaka