From Cellulosic Material Patents (Class 264/29.4)
  • Patent number: 11697106
    Abstract: A porous carbon material composite formed of a porous carbon material and a functional material and equipped with high functionality. The porous carbon material composite is formed of (A) a porous carbon material obtainable from a plant-derived material having a silicon (Si) content of 5 wt % or higher as a raw material; and (B) a functional material adhered on the porous carbon material, and has a specific surface area of 10 m2/g or greater as determined by the nitrogen BET method and a pore volume of 0.1 cm3/g or greater as determined by the BJH method and MP method.
    Type: Grant
    Filed: October 8, 2020
    Date of Patent: July 11, 2023
    Assignee: SONY CORPORATION
    Inventors: Hironori Iida, Seiichiro Tabata, Shinichiro Yamada, Tsutomu Noguchi, Shun Yamanoi
  • Patent number: 11530303
    Abstract: Perovskite-polymer composites including perovskite nanocrystals dispersed in a polymer matrix, wherein the perovskite nanocrystals have an average size of from about nm to about 20 nm. Methods for producing a perovskite-polymer composites that may include contacting a solid material comprising a polymer matrix with a solution comprising a perovskite precursor; allowing the solution to penetrate the solid material to yield a swollen solid material comprising the perovskite precursor dispersed within the polymer matrix; optionally contacting the swollen solid material with an antisolvent; and annealing the swollen solid material to crystallize the perovskite precursor and to yield the perovskite-polymer composite comprising perovskite nanocrystals dispersed in the polymer matrix.
    Type: Grant
    Filed: July 30, 2020
    Date of Patent: December 20, 2022
    Assignee: University of Central Florida Research Foundation, Inc.
    Inventors: Yajie Dong, Shin-Tson Wu, Caicai Zhang, Ziqian He
  • Patent number: 10654722
    Abstract: Methods for making carbon materials are provided. In at least one specific embodiment, the method can include combining one or more polymer precursors with one or more liquids to produce a mixture. The mixture can be an emulsion, dispersion, or a suspension. The liquid can include hexane, pentane, cyclopentane, benzene, toluene, o-xylene, m-xylene, p-xylene, diethyl ether, ethylmethylketone, dichloromethane, tetrahydrofuran, mineral oils, paraffin oils, vegetable derived oils, or any mixture thereof. The method can also include aging the mixture at a temperature and time sufficient for the polymer precursor to react and form polymer gel particles having a volume average particle size (Dv,50) of the polymer particles in gel form greater than or equal to 1 mm. The method can also include heating the polymer gel particles to produce a carbon material.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: May 19, 2020
    Assignees: Georgia-Pacific Chemicals LLC, Energ2 Technologies, Inc.
    Inventors: Katharine Geramita, Benjamin E. Kron, Henry R. Costantino, Aaron M. Feaver, Avery Sakshaug, Leah A. Thompkins, Alan Tzu-Yang Chang, Xing Dong, Shahid P. Qureshi, John B. Hines, Gerald A. Knazek, Joseph Frank Ludvik
  • Patent number: 9657413
    Abstract: A continuous carbonization method for the carbonization of a continuous, oxidized polyacrylonitrile (PAN) precursor fiber, wherein the precursor fiber exiting the carbonization system is a carbonized fiber which has been exposed to an atmosphere comprising 5% or less, preferably 0.1% or less, more preferably 0%, by volume of oxygen during its passage from a high temperature furnace to the next high temperature furnace. In one embodiment, the carbonization system includes a pre-carbonization furnace, a carbonization furnace, a substantially air-tight chamber between the furnaces, and a drive stand carrying a plurality of drive rollers that are enclosed by the air-tight chamber.
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: May 23, 2017
    Assignee: Cytec Industries Inc.
    Inventors: Girish Vishnukant Deshpande, Barry DeWayne Meece, Robert Phil Fennell
  • Publication number: 20150069285
    Abstract: The invention is directed to the production of metal-carbon containing bodies, which process comprises impregnating cellulose, cellulose-like or carbohydrate bodies with an aqueous solution of at least one metal compound, followed by heating the impregnated bodies in an inert and substantially oxygen-free atmosphere, thereby reducing at least part of the at least one metal compound to the corresponding metal or metal alloy.
    Type: Application
    Filed: November 19, 2014
    Publication date: March 12, 2015
    Applicant: BASF Corporation
    Inventors: Jacobus Hoekstra, John Wilhelm Geus, Leonardus Wijnand Jenneskens, Dirk van de Kleut, Edward Jan Vlietstra
  • Patent number: 8673188
    Abstract: A carbon/carbon part and a process for making carbon/carbon parts is provided. The process involves forming steps, carbonization steps and densification steps. The forming steps may include needling fibrous layers to form fibers that extend in three directions. The carbonization steps may include applying pressure to increase the fiber volume ratio of the fibrous preform. The densification steps may include filling the voids of the fibrous preform with a carbon matrix.
    Type: Grant
    Filed: February 14, 2006
    Date of Patent: March 18, 2014
    Assignee: Goodrich Corporation
    Inventors: John S. Linck, Chris T. Kirkpatrick
  • Patent number: 8555896
    Abstract: A method of forming activated carbon from microcrystalline cellulose comprises converting the microcrystalline cellulose powder into microcrystalline cellulose beads using extrusion and spheronization, carbonizing microcrystalline cellulose to form carbonized microcrystalline cellulose and activating the carbonized microcrystalline cellulose to form activated carbon. The final size of the activated carbon beads, which preferably are of practically spherical shape, can be controlled through the process of making microcrystalline cellulose beads.
    Type: Grant
    Filed: December 19, 2007
    Date of Patent: October 15, 2013
    Assignee: Philip Morris USA Inc.
    Inventors: Georgios D. Karles, Shuzhong Zhuang
  • Publication number: 20130255216
    Abstract: The present disclosure relates to reactive modified lignin, methods of preparing such modified lignin, and materials, such as polymer systems, incorporating the modified lignin. More specifically, the lignin can be modified by selectively masking reactive functional groups such that the material has a modulated reactivity and is thus better suited for incorporation into and/or formation of further materials, such as carbon fibers.
    Type: Application
    Filed: February 20, 2013
    Publication date: October 3, 2013
    Applicant: NORTH CAROLINA STATE UNIVERSITY
    Inventor: Dimitris S. Argyropoulos
  • Publication number: 20120313271
    Abstract: A method of producing carbon-based sorbent by (a) mixing carbon-containing raw materials with group I, II, and/or III oxides and/or hydroxides; (b) carbonizing at low temperatures of between 100° C. and 280° C.; followed by carbonizing at high temperatures of between 280° C. and 500° C., whereby simultaneously dehydrating the hydrates and releasing superheated dry steam at high temperature exceeding 500° C.; and (c) directing the superheated dry steam against the direction of the feed flow.
    Type: Application
    Filed: June 10, 2012
    Publication date: December 13, 2012
    Inventor: Stanislaw ROGUT
  • Patent number: 8222171
    Abstract: A method for the production of a ceramic substrate for a semiconductor component, includes the steps of producing paper containing at least cellulose fibers, as well as a filler to be carbonized and/or SiC, pyrolizing the produced paper, and siliconizing the pyrolyzed paper.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: July 17, 2012
    Assignee: Schunk Kohlenstofftechnik GmbH
    Inventors: Marco Ebert, Martin Henrich, Andreas Lauer, Gotthard Nauditt, Thorsten Scheibel, Roland Weiss
  • Patent number: 8221894
    Abstract: The present invention relates to the technical filed of wood processing, in particular to the method for strengthening the wood surface, the profiles and the solid wood flooring of the same. The density of the surface-strengthened solid wood profiles are 300˜580 Kg/m3, the reinforced surface is 1˜5 mm thick, the hardness of the paint film of the reinforced surface is 2H˜8H, the overall moisture content of the profiles are 6˜9%. The hardness of the paint film on the reinforced surface of the inventive solid wood profiles is higher, and the overall moisture content is stable, which is suitable for wider range of climate conditions.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: July 17, 2012
    Assignee: Zhejiang Shiyou Timber Co., Ltd.
    Inventors: Tu Dengyun, Ni Yuezhong
  • Publication number: 20120177562
    Abstract: A process for producing densified and at least partially graphitised carbonaceous product. The process includes the following steps: heating a biomass in an oxygen controlled atmosphere to a first temperature under compression to form a plastically deformed intermediate product and heating the plastically deformed intermediate product in an oxygen controlled atmosphere to a second temperature that is higher than the first temperature, while constraining the intermediate product to limit or avoid volume expansion to form the densified and at least partially graphitised carbonaceous product.
    Type: Application
    Filed: August 4, 2010
    Publication date: July 12, 2012
    Applicant: COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH CORPORATION
    Inventors: Roy Randall Lovel, Malisja De Varies
  • Patent number: 8187400
    Abstract: Disclosed herein are a microtubular honeycomb carbon material obtained by heat-treating cellulose fiber, a production method thereof, a microtubular reactor module fabricated using the microtubular honeycomb carbon, a method for producing the microtubular reactor module, and a microcatalytic reactor system comprising the microtubular reactor module. A carbon material having a new structure is produced by heat-treating cellulose fiber, and a catalytic reactor system having a new structure is constructed by coating the surface of the carbon material with a metal catalyst. Cellulose carbide, used as the reactor material, is very simple to produce. Because it has a micro honeycomb structure having a large number of microchannels and a large number of mesopores, it can be loaded with a large amount of a catalyst compared to the prior material having the same area, and thus it is useful as a catalyst support, and the reaction efficiency can be maximized.
    Type: Grant
    Filed: February 19, 2008
    Date of Patent: May 29, 2012
    Assignee: Korea Institute of Energy Research
    Inventors: Nam Jo Jeong, Seong Ok Han, Hong Soo Kim, Hee Yeon Kim
  • Patent number: 8153038
    Abstract: The present invention relates to a type of wood section material manufacturing method, especially with respect to soft wood section material and its manufacturing method. It belongs to wood processing field. This invention is achieved by the following technical plans: a type of wood section material manufacturing method includes the following steps: (1) wood preparation; (2) drying; (3) Polishing; (4) Hot pressing, which is to use two hot pressing boards with 140-200° C. to firmly press two surfaces of panel blank material; (5) Pre-carbonization, which pre-carbonize the panel blank material under 160° C. and 200° C.; (6) Carbonization, which carbonize the panel blank material between 200° C. and 225° C.; (7) Cooling; and (8) Moisture content control. This invention is particularly suitable to make wooden floor boards and office furniture.
    Type: Grant
    Filed: July 5, 2011
    Date of Patent: April 10, 2012
    Assignee: Zhejiang Shiyou Timber Co. Ltd.
    Inventors: Dengyun Tu, Chengfeng Pan, Xin Zhang, Yuezhong Ni, Xueli Yu
  • Publication number: 20110262685
    Abstract: The present invention relates to a solid wood section material and its manufacturing method. This invention is achieved by the following technical plans: a type of surface-reinforced solid wood product, including a compacted layer and a natural layer connected with fibre, has total density of between 350 and 750 kg/m3, moisture content between 5 and 12%, corrosion grade greater than II and weight loss less than or equal to 24%. This invention is particularly suitable to make floor boards.
    Type: Application
    Filed: July 4, 2011
    Publication date: October 27, 2011
    Applicants: ZHEJIANG SHIYOU TIMBER CO. LTD.
    Inventors: Dengyun Tu, Chengfeng Pan, Xin Zhang, Yuezhong Ni, Xueli Yu
  • Patent number: 8034266
    Abstract: A process for the production of an open-cell carbon foam from a metallic salt of a lignosulfonate is described. The process includes heating the metallic salt of a lignosulfonate from ambient temperature to a maximum temperature, greater than about 250° C., at a rate sufficiently slow as to provide for essentially uniform heating of the lignin derived material. Heating of the lignin derived material is performed in a non-oxidizing atmosphere having a pressure greater than about 100 psig. The resultant carbon foam can subsequently be optionally subjected to carbonization or graphitization temperatures as desired. The resultant carbon foam has a regular open-cell structure. Densities of the carbon foam products are commonly in the range of about 0.1 g/cm3 to 0.2 g/cm3. The carbon foams may also exhibit compressive strengths of up to about 200 psi. The carbon foam materials potentially have utility as lightweight thermal barriers and in many other of the applications associated with carbon foams.
    Type: Grant
    Filed: August 3, 2004
    Date of Patent: October 11, 2011
    Assignee: Touchstone Research Laboratory, Ltd.
    Inventors: Drew M. Spradling, Doug R. Amie
  • Patent number: 7867612
    Abstract: A composite material is described that contains a reinforcing resin and reinforcing fibers, wherein the reinforcing fibers have a coating containing polyphenylene sulfide and the proportion of polyphenylene sulfide relative to the uncoated fibers is 0.001 to <0.01 wt. %. The composite material shows higher apparent interlaminar shear strength and bending strength as compared with similar composite materials having no PPS coating in the above concentration range.
    Type: Grant
    Filed: March 28, 2003
    Date of Patent: January 11, 2011
    Assignee: Toho Tenax Europe GmbH
    Inventors: Klaus Peter Schwung, Bernd Wohlmann
  • Patent number: 7785447
    Abstract: Closed apparatus and processes by which carbon feedstock is composed of a mixture of non-coking coal fines and another carbonaceous material, such as waste coke fines, are described. The coal and coke fines are mixed together and may be formed into solid pieces. The mixture alone or as solid pieces is fired through pyrolyzation into solid pieces of coke, with solid and gaseous by-products of pyrolyzation being recycled for use within the coke-producing closed system, thereby reducing or eliminating release of undesirable substances to the environment. A char-forming binder may or may not be added to the carbon mixture prior to pyrolyzation.
    Type: Grant
    Filed: December 3, 2007
    Date of Patent: August 31, 2010
    Assignee: Combustion Resources, LLC
    Inventors: Craig N. Eatough, Jon S. Heaton, Steven R. Eatough
  • Patent number: 7758779
    Abstract: A reinforced carbon foam material is formed from carbon fibers incorporated within a carbon foam's structure. First, carbon fiber bundles are combined with a liquid resol resin. The carbon fiber bundles separate into individual carbon fiber filaments and disperse throughout the liquid resol resin. Second, the carbon fiber resin mixture is foamed thus fixing the carbon fibers in a permanent spatial arrangement within the phenolic foam. The foam is then carbonized to create a carbon fiber reinforced foam with improved graphitic characteristics as well as increased strength. Optionally, various additives can be introduced simultaneously with the addition of the carbon fiber bundles into the liquid resol, which can improve the graphitic nature of the final carbon foam material and/or increase the foam's resistance to oxidation.
    Type: Grant
    Filed: December 29, 2005
    Date of Patent: July 20, 2010
    Assignee: GrafTech International Holdings Inc.
    Inventors: Douglas J. Miller, Irwin C. Lewis, Richard L. Shao, Mehmet Suha Yazici
  • Publication number: 20100004119
    Abstract: Sorbents comprising activated carbon particles, sulfur, and metal catalyst. The sorbents may be used, for example, for the removal of a contaminant, such as mercury, from a fluid stream.
    Type: Application
    Filed: July 3, 2008
    Publication date: January 7, 2010
    Inventors: Kishor Purushottam Gadkaree, Anbo Liu
  • Publication number: 20090220775
    Abstract: By controlling the heating speed and the pressure in carbonizing a wood powder, a macroporous carbon material is formed. Herein provided are the macroporous carbon material starting from a wood material, and a method for producing it.
    Type: Application
    Filed: May 2, 2007
    Publication date: September 3, 2009
    Inventors: Fumio Kurosaki, Hideki Koyanaka
  • Publication number: 20090074633
    Abstract: Disclosed herein are a microtubular honeycomb carbon material obtained by heat-treating cellulose fiber, a production method thereof, a microtubular reactor module fabricated using the microtubular honeycomb carbon, a method for producing the microtubular reactor module, and a microcatalytic reactor system comprising the microtubular reactor module. A carbon material having a new structure is produced by heat-treating cellulose fiber, and a catalytic reactor system having a new structure is constructed by coating the surface of the carbon material with a metal catalyst. Cellulose carbide, used as the reactor material, is very simple to produce. Because it has a micro honeycomb structure having a large number of microchannels and a large number of mesopores, it can be loaded with a large amount of a catalyst compared to the prior material having the same area, and thus it is useful as a catalyst support, and the reaction efficiency can be maximized.
    Type: Application
    Filed: February 19, 2008
    Publication date: March 19, 2009
    Applicant: Korea Institute of Energy Research
    Inventors: Nam Jo Jeong, Seong Ok Han, Hong Soo Kim, Hee Yeon Kim
  • Publication number: 20080258323
    Abstract: A method for making a bamboo-made tool handle, has the following steps. A bamboo material is cut into multiple bamboo strips. Green skins of the bamboo strips are removed to obtain original bamboo strips. The original bamboo strips are steamed with hydrogen peroxide and dried to obtain dried bamboo strips. The dried bamboo strips is turned to obtain turned bamboo woods. The turned bamboo wood is carbonized to obtain carbonized bamboo woods. The carbonized bamboo wood is combined to obtain a bamboo wood bundle, wherein each carbonized bamboo woods are combined at a longitudinal direction. The method for making a bamboo-made tool handle is convenient and could obtain an elastic and tough bamboo tool handle.
    Type: Application
    Filed: April 20, 2007
    Publication date: October 23, 2008
    Inventor: Yi-Kung Hung
  • Patent number: 6967014
    Abstract: The carbonization of cellulose fiber fabric comprises an initial stage of heat treatment up to 250° C. to 350° C., with a relatively high mean temperature rise speed of 10° C./min to 60° C./min, an intermediate stage up to 350° C. to 500° C. with a lower mean temperature rise speed of 2° C./min to 10° C./min, and a final stage up to 500° C. to 750° C. with a mean temperature rise speed that is again raised to 5° C./min to 40° C./min.
    Type: Grant
    Filed: December 5, 2000
    Date of Patent: November 22, 2005
    Assignee: Snecma Moteurs
    Inventors: Pierre Olry, Mark Kazakov, Sylvie Loison, Marina Marakhovskaya
  • Patent number: 6881512
    Abstract: A separator for fuel cell, formed using a base material obtained from a composition comprising at least a binder, a powdery carbon filler having an average particle diameter of 10 nm to 100 ?m, and a short fiber having an average fiber length of 0.03 to 6 mm, in which composition the amount ratio of the above three components is such that the amount of the powdery carbon filler is 200 to 800 parts by weight and the amount of the short fiber is 10 to 300 parts by weight, both per 100 parts by weight of the binder.
    Type: Grant
    Filed: December 13, 2001
    Date of Patent: April 19, 2005
    Assignee: Nisshinbo Industries, Inc.
    Inventors: Kazuo Saito, Atsushi Hagiwara
  • Patent number: 6875263
    Abstract: This invention relates to the use of a filler derived from cereal husk, more particularly rice husk, in composite materials to enhance the flame retardant, antistatic, accelerator, plasticiser and blowing characteristics in various composite materials.
    Type: Grant
    Filed: January 17, 2000
    Date of Patent: April 5, 2005
    Assignees: Contract Research and Development
    Inventors: Mailvaganam Thavalingam Sivasithambaram Pillai, Khalid Haji Ahmad, Arulgnanam Vettivaloo Arunasalam
  • Publication number: 20040191632
    Abstract: A battery having a current collector constructed of carbon foam. The carbon foam includes a network of pores into which a chemically active material is disposed to create either a positive or negative plate for the battery. The carbon foam resists corrosion and exhibits a large amount of surface area. The invention includes a method for making the disclosed carbon foam current collector used in the battery.
    Type: Application
    Filed: March 12, 2004
    Publication date: September 30, 2004
    Inventors: Kurtis Chad Kelley, John J. Votoupal
  • Patent number: 6787075
    Abstract: A method of making a low friction bearing for use when immersed in a liquid particularly water is provided comprising a synthetic resin composition which includes powders of a rice bran ceramic, carbon rice bran ceramic or both which are uniformly dispersed in a synthetic resin. The weight ratio between the RBC or CRBC powders and the synthetic resin is 30:90 to 70:10.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: September 7, 2004
    Assignee: Minebea Co., Ltd.
    Inventors: Kazuo Hokkirigawa, Rikuro Obara
  • Patent number: 6682667
    Abstract: A method for producing self-supporting activated carbon structures is disclosed. The method comprises the steps of mixing a granular activated carbon, a binder material, a carbonization agent, and a liquid to produce a semi-plastic mixture; compacting the mixture using compacting pressures of or greater than about 100 pounds per square inch to form a three-dimensional structure; and heating the structure to an elevated temperature of or greater than about 300° C. to produce a self-supporting activated carbon structure. The granular activated carbon is of any particle size between approximately 4 and 325 mesh U.S. Sieve Series, and the binder is a ground cereal grain, cereal rain flour or a tuber flour. The resultant structure may then be cooled to near-ambient temperatures under an essentially inert atmosphere. Such structures can exhibit good mechanical strengths, adsorption capacities nearly equivalent to those of the activated carbon used in their preparation, and appreciable electrical conductivity.
    Type: Grant
    Filed: February 5, 2002
    Date of Patent: January 27, 2004
    Assignee: Calgon Carbon Corporation
    Inventor: Thomas M. Matviya
  • Publication number: 20040005461
    Abstract: A method of carbonizing fabricated wood-based materials, such as wood composition board, is disclosed. Fabricated wood-based material is used as a precursor material, which is carbonized under controlled temperature and atmosphere conditions to produce a porous carbon product having substantially the same cellular structure as the precursor fabricated wood-based material. The porous carbonized product may be used for various applications such as filters, fuel cell gas separators, and battery electrodes, or may be further processed to form carbon-polymer or carbon-carbon composites. The carbonized product may also be converted to a ceramic such as silicon carbide. Additional processing may be used to form ceramic-metal or ceramic-ceramic composites.
    Type: Application
    Filed: April 23, 2003
    Publication date: January 8, 2004
    Inventors: Dennis C. Nagle, Andrew Keith Kercher
  • Publication number: 20030132540
    Abstract: A method is provided for forming items from ecoceramic-based silicon-carbide. A wood preform is machined to a general shape having over- or undersized dimensions. The preform is pyrolyzed to transform the wood of the preform to a porous, carbonaceous material that retains the general shape of the preform. The preform is then machined to final, net-shape dimensions and immersed in liquid silicon or silicon alloy that penetrates and infuses the preform. The infused preform is held at a temperature sufficient to cause the transformation of the material in the preform to silicon carbide, completing formation of the item. Also provided is a method of forming ecoceramic-based tooling and composite components using the tooling.
    Type: Application
    Filed: January 11, 2002
    Publication date: July 17, 2003
    Inventor: Slade H. Gardner
  • Patent number: 6573215
    Abstract: A porous material suitable for use in a bearing rolling element. The porous material is obtained by a process which includes mixing degreased bran derived from rice bran with a thermosetting resin before kneading, subjecting a kneaded mixture to a primary firing in an inert gas at a temperature in a range of 700 to 100° C., pulverizing the kneaded mixture after the primary firing into carbonized powders sieved through a screen of 100-mesh, mixing the carbonized powders or the carbonized powders and ceramic powders with a thermosetting resin before kneading, pressure-forming a kneaded mixture thus obtained at a pressure in a range of 20 to 30 MPa, and applying a heat treatment again to a formed kneaded mixture in the inert gas at a temperature in a range of 100 to 1100° C.
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: June 3, 2003
    Assignee: Minebea Co., Ltd.
    Inventors: Kazuo Hokkirigawa, Rikuro Obara, Motoharu Akiyama
  • Patent number: 6395677
    Abstract: There is provided a porous material suitable for use in a bearing retainer, having such properties as a small contraction ratio of the dimensions of a formed workpiece to those of a finished product, excellent hot oil resistance, small contraction change, insusceptibility to damage, light weight, a long service life, and ability to retain oil and grease for a long period of time. The porous material suitable for use in the bearing retainer is obtained by a process comprising the steps of mixing degreased bran derived from rice bran with a thermosetting resin before kneading, subjecting a kneaded mixture to a primary firing in an inert gas at a temperature in a range of 700 to 1000° C.
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: May 28, 2002
    Assignee: Minebea Co., Ltd.
    Inventors: Kazuo Hokkirigawa, Rikuro Obara, Motoharu Akiyama
  • Patent number: 6245385
    Abstract: Cellulosic single fibers such as cotton is prepared without any resins or pitches to a mass or bulk such as a lap which is self-shaped and retains its form by a force of cohesive intertanglement of fibers. The mass as prepared is heated for carbonization or graphitization, if desired, to obtain unique shaped carbides of porous and stable structures in which the cohesion of fibers is made more dense on account of the total shrinkage of the mass by carbonization.
    Type: Grant
    Filed: November 9, 1999
    Date of Patent: June 12, 2001
    Inventors: Minoru Takahashi, Ryoji Harada