Patents by Inventor Louis A. Joo
Louis A. Joo 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).
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Patent number: 4891279Abstract: A porous graphite electrode for a fuel cell is formed by impregnation of a cellulosic filter paper by coating or impregnating with a low coke yield impregnant on the active center area and with a high coke yield impregnant on the edges, followed by curing, baking, and graphitizing the electrode to form a monolithic porous graphite electrode base with a dense low porosity area at the edges with a less dense higher porosity center working area.Type: GrantFiled: April 11, 1988Date of Patent: January 2, 1990Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo, Kenneth W. Tucker, Jay R. Shaner
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Patent number: 4782586Abstract: A porous graphite electrode for a fuel cell is formed by impregnation of a cellulosic filter paper by coating or impregnating with a low coke yield impregnant on the active center area and with a high coke yield impregnant on the edges, followed by curing, baking, and graphitizing the electrode to form a monolithic porous graphite electrode base with a dense low porosity area at the edges with a less dense higher porosity center working area.Type: GrantFiled: March 23, 1988Date of Patent: November 8, 1988Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo, Kenneth W. Tucker, Jay R. Shaner
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Patent number: 4728535Abstract: Thin carbon products are produced from cellulose material by impregnation with a carbonaceous material followed by curing and baking. The baked product may optionally be graphitized depending on end use.Type: GrantFiled: June 7, 1985Date of Patent: March 1, 1988Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo', Kenneth W. Tucker, Frank E. McCown, Jr.
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Patent number: 4617053Abstract: A refractory hard metal-metal composite is formed by impregnating a porous refractory hard metal article with molten metal.Type: GrantFiled: September 20, 1985Date of Patent: October 14, 1986Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo, Kenneth W. Tucker, Jay R. Shaner
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Patent number: 4611396Abstract: A porous graphite electrode for a fuel cell is formed by impregnation of a cellulosic filter paper by coating or impregnating with a low coke yield impregnant on the active center area and with a high coke yield impregnant on the edges, followed by curing, baking, and graphitizing the electrode to form a monolithic porous graphite electrode base with a dense low porosity area at the edges with a less dense higher porosity center working area.Type: GrantFiled: April 15, 1985Date of Patent: September 16, 1986Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo, Kenneth W. Tucker, Jay R. Shaner
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Patent number: 4529494Abstract: A monolithic bipolar electrode for the production of primary aluminum by molten salt electrolysis is composed of a cermet anodic layer 10, a conductive and diffusion-resistant intermediate layer 14, and a refractory hard metal cathodic layer 20, with the edges covered by an electrolyte-resistant coating. The intermediate conductive layer 14 has a coefficient of thermal expansion intermediate to the anodic and cathodic layers.Type: GrantFiled: May 17, 1984Date of Patent: July 16, 1985Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo', Duane R. Secrist, James M. Clark, Kenneth W. Tucker, Jay R. Shaner
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Patent number: 4526669Abstract: A cathodic element for a Hall-Heroult aluminum reduction cell is formed from a refractory hard metal, preferably TiB.sub.2, in a generally mushroom-shaped configuration. The element is economical of raw materials and has improved thermal endurance when compared to a right cylinder or other element of uniform cross-section.Type: GrantFiled: June 3, 1982Date of Patent: July 2, 1985Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo, Kenneth W. Tucker, Scott D. Webb
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Patent number: 4465581Abstract: TiB.sub.2 -graphite composite articles suitable for use as cathode components in a Hall aluminum reduction cell are made by impregnating a TiO.sub.2 -carbon composite with a boron compound and carbon black dispersed in water, or alternately by impregnating a boron or boron compound-carbon composite with a carbon black-TiO.sub.2 dispersion, and heating the article to a reaction temperature whereby TiB.sub.2 is formed and the amorphous carbon converted to graphite. The article may be impregnated with a carbonizable liquid, re-baked, and re-heated to a graphitizing temperature to increase its strength and density.Type: GrantFiled: July 27, 1981Date of Patent: August 14, 1984Assignee: Great Lakes Carbon CorporationInventors: Leslie H. Juel, Louis A. Joo', Kenneth W. Tucker
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Patent number: 4439382Abstract: Titanium diboride graphite composite articles are produced by mixing TiO.sub.2, petroleum coke and a binder to form a plastic dispersion. Articles are shaped by molding or extrusion and baked to carbonize the binder to form a baked carbon-TiO.sub.2 composite. The article is impregnated with a molten or dispersed boron compound, then heated to drive TiB.sub.2 forming reaction. The article is then further heated to a graphitizing temperature to form a graphite-TiB.sub.2 composite useful as a cathode component in a Hall aluminum reduction cell.Type: GrantFiled: July 27, 1981Date of Patent: March 27, 1984Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo', Kenneth W. Tucker, Frank E. McCown, Jr.
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Patent number: 4377463Abstract: TiB.sub.2 -carbon composites are produced by mixing the raw materials comprised of carbon, TiB.sub.2, pitch, and other reactants, forming a shaped article, processing in a nitrogen atmosphere up to 2100.degree. C., and in a noble gas above 2100.degree. C.Type: GrantFiled: July 27, 1981Date of Patent: March 22, 1983Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo, Kenneth W. Tucker, Scott D. Webb
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Patent number: 4376029Abstract: A cathode component for a Hall aluminum cell is economically produced from a mixture of a carbon source, preferably calcined petroleum coke, and optionally calcined acicular needle petroleum coke, calcined anthracite coal; a binder such as pitch including the various petroleum and coal tar pitches; titanium dioxide, TiO.sub.2 ; and boric acid, B.sub.2 O.sub.3 or boron carbide, B.sub.4 C; forming said mixture into shapes and heating to a TiB.sub.2 -forming temperature.Type: GrantFiled: September 11, 1980Date of Patent: March 8, 1983Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo', Kenneth W. Tucker, Frank E. McCown
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Patent number: 4233378Abstract: An electrode for a high temperature secondary electrical storage cell including an alkali metal negative electrode, a molten salt electrolyte, and a transition metal sulfide as the positive electrode, formed by mechanically loading a precut form or graphite felt or foam with FeS.sub.x powder, coating or impregnating the precut form with a high carbon yield resin, curing the resin at an intermediate temperature, and carbonizing the resin at a temperature below 1000.degree. C.Type: GrantFiled: December 11, 1978Date of Patent: November 11, 1980Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo', Frederick C. Miller
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Patent number: 4144383Abstract: A rechargeable electrical energy storage device including a lithium-containing negative electrode, a lithium ion electrolyte, and a positive electrode containing iron sulfide formed in situ by the reaction of a predeposited solid iron salt and hydrogen sulfide within a porous carbon structural body.Type: GrantFiled: October 3, 1977Date of Patent: March 13, 1979Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo', Frederick C. Miller
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Patent number: 4143217Abstract: A positive electrode for a rechargeable electrical energy storage device containing a lithium or lithium-aluminum negative electrode, an electrolyte with lithium ions, and a positive electrode formed by impregnating a molded iron sulfide compact with a pitch or thermosetting resin, and subsequently carbonizing the pitch or resin to form an in situ carbon structure, to serve as the foundation for the electrode.Type: GrantFiled: October 3, 1977Date of Patent: March 6, 1979Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo', Frederick C. Miller
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Patent number: 4127634Abstract: A sulfur electrode for a sodium-sulfur secondary battery comprises a mixture of chopped graphite fibers and sulfur formed into a solid composite structure.Type: GrantFiled: January 4, 1978Date of Patent: November 28, 1978Assignee: Great Lakes Carbon CorporationInventor: Louis A. Joo'
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Patent number: 3989802Abstract: Carbon fibers are surface oxidized by contacting the fiber with an aqueous solution comprising 5 - 20 weight percent sodium dichromate and 15 - 45 percent sulfuric acid for from one to sixty minutes at about the boiling point of the mixture. These fibers are useful in making resin-based composites by improving the adhesion between the fibers and the resin.Type: GrantFiled: March 21, 1973Date of Patent: November 2, 1976Assignee: Great Lakes Carbon CorporationInventors: Louis A. Joo, Roger Prescott, Gordon E. Sharpe, Frank E. Snodgrass