Patents by Inventor Irwin Charles Lewis
Irwin Charles Lewis 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: 7544316Abstract: A process for preparing graphite articles is presented. In particular, the process includes employing a particulate fraction comprising at least about 35 weight percent coke, coal or combinations thereof having a diameter such that a major fraction of it passes through a 0.25 mm to 25 mm mesh screen. The particulate fraction is mixed with a liquid or solid pitch binder, to form a stock blend; the stock blend is extruded to form a green stock; the green stock is baked to form a carbonized stock; and the carbonized stock is graphitized. The stock blend further includes carbon fibers added after mixing of the particulate fraction and pitch has begun.Type: GrantFiled: June 8, 2005Date of Patent: June 9, 2009Assignee: GrafTech International Holdings Inc.Inventors: James William Kortovich, Richard Liichang Shao, Irwin Charles Lewis, Richard Thomas Lewis, Dai Huang
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Patent number: 7150837Abstract: Insulation materials suited to high temperature applications, such as the insulation of furnaces, are formed from a mixture of pitch carbon fibers, such as isotropic pitch carbon fibers, and a binder comprising a solution of sugar in water. The sugar solution is preferably at a concentration of from 20–60% sucrose to yield a low density material having high flexural strength and low thermal conductivity when carbonized to a temperature of about 1800° C.Type: GrantFiled: June 10, 2004Date of Patent: December 19, 2006Assignee: UCAR Carbon Company, Inc.Inventors: Charles C. Chiu, Irwin Charles Lewis, Ching-Feng Chang
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Patent number: 6916435Abstract: A process for preparing graphite articles is presented. In particular, the process includes employing a particulate fraction comprising at least about 35 weight percent coke, coal or combinations thereof having a diameter such that a major fraction of it passes through a 0.25 mm to 25 mm mesh screen. The particulate fraction is mixed with a liquid or solid pitch binder, to form a stock blend; the stock blend is extruded to form a green stock; the green stock is baked to form a carbonized stock; and the carbonized stock is graphitized. The stock blend further comprises one or both of carbon fibers (advantageously added after mixing of the particulate fraction and pitch has begun) and small particle size filler (advantageously added as part of the particulate fraction).Type: GrantFiled: August 27, 2003Date of Patent: July 12, 2005Assignee: Ucar Carbon Company Inc.Inventors: James William Kortovich, Richard Liichang Shao, Dai Huang, Irwin Charles Lewis, Richard Thomas Lewis
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Patent number: 6800364Abstract: Insulation materials suited to high temperature applications, such as the insulation of furnaces, are formed from a mixture of pitch carbon fibers, such as isotropic pitch carbon fibers, and a binder comprising a solution of sugar in water. The sugar solution is preferably at a concentration of from 20-60% sucrose to yield a low density material having high flexural strength and low thermal conductivity when carbonized to a temperature of about 1800° C.Type: GrantFiled: June 28, 2002Date of Patent: October 5, 2004Assignee: UCAR Carbon Company Inc.Inventors: Charles C. Chiu, Irwin Charles Lewis, Ching-Feng Chang
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Publication number: 20040104497Abstract: A process for preparing graphite articles is presented. In particular, the process includes employing a particulate fraction comprising at least about 35 weight percent coke, coal or combinations thereof having a diameter such that a major fraction of it passes through a 0.25 mm to 25 mm mesh screen. The particulate fraction is mixed with a liquid or solid pitch binder, to form a stock blend; the stock blend is extruded to form a green stock; the green stock is baked to form a carbonized stock; and the carbonized stock is graphitized. The stock blend further comprises one or both of carbon fibers (advantageously added after mixing of the particulate fraction and pitch has begun) and small particle size filler (advantageously added as part of the particulate fraction).Type: ApplicationFiled: August 27, 2003Publication date: June 3, 2004Inventors: James William Kortovich, Richard Liichang Shao, Dai Huang, Irwin Charles Lewis, Richard Thomas Lewis
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Publication number: 20040005446Abstract: Insulation materials suited to high temperature applications, such as the insulation of furnaces, are formed from a mixture of pitch carbon fibers, such as isotropic pitch carbon fibers, and a binder comprising a solution of sugar in water. The sugar solution is preferably at a concentration of from 20-60% sucrose to yield a low density material having high flexural strength and low thermal conductivity when carbonized to a temperature of about 1800° C.Type: ApplicationFiled: June 28, 2002Publication date: January 8, 2004Applicant: UCAR Carbon Company Inc.Inventors: Charles C. Chiu, Irwin Charles Lewis, Ching-Feng Chang
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Publication number: 20030087095Abstract: A sugar/additive blend useful as a binder or impregnant for carbon products. Simple sugars as well as sucrose are combined either in solution or in solid form with reactive additives such as ammonium hydrogen phosphate, ammonium chloride and para-toluene sulfuric acid. The sugar/additive blends form more and denser carbon residue than sugar alone when subjected to pyrolysis.Type: ApplicationFiled: September 28, 2001Publication date: May 8, 2003Inventors: Irwin Charles Lewis, Terrence Anthony Pirro
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Publication number: 20030072959Abstract: A sugar/additive blend useful as a binder or impregnant for carbon products. Simple sugars as well as sucrose are combined either in solution or in solid form with reactive additives such as ammonium hydrogen phosphate, ammonium chloride and para-toluene sulfuric acid. The sugar/additive blends form more and denser carbon residue than sugar alone when subjected to pyrolysis.Type: ApplicationFiled: June 28, 2002Publication date: April 17, 2003Applicant: UCAR Carbon Company Inc.Inventors: Irwin Charles Lewis, Terrence Anthony Pirro
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Publication number: 20030066523Abstract: A sugar/additive blend useful as a binder or impregnant for carbon products. Simple sugars as well as sucrose are combined either in solution or in solid form with reactive additives such as ammonium hydrogen phosphate, ammonium chloride and para-toluene sulfuric acid. The sugar/additive blends form more and denser carbon residue than sugar alone when subjected to pyrolysis.Type: ApplicationFiled: June 28, 2002Publication date: April 10, 2003Applicant: UCAR Carbon Company Inc.Inventors: Irwin Charles Lewis, Terrence Anthony Pirro
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Patent number: 6440563Abstract: A process for preparing pins for connecting carbon electrodes is presented. In particular, a process for preparing pins for connecting carbon electrodes including the steps of combining calcined coke, a liquid pitch binder and carbon fibers derived from mesophase pitch to form a pinstock blend; extruding the pinstock blend to form a green pinstock; baking the green pinstock to form a carbonized pinstock; and graphitizing the carbonized pinstock by maintaining the carbonized pinstock at a temperature of at least about 2500° C. for no more than about 18 hours is presented. The pins prepared by the inventive process are also presented.Type: GrantFiled: April 18, 2001Date of Patent: August 27, 2002Assignee: UCAR Carbon Company Inc.Inventors: Richard Liichang Shao, James William Kortovich, Irwin Charles Lewis, Richard Thomas Lewis
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Publication number: 20010033036Abstract: A process for preparing pins for connecting carbon electrodes is presented. In particular, a process for preparing pins for connecting carbon electrodes including the steps of combining calcined coke, a liquid pitch binder and carbon fibers derived from mesophase pitch to form a pinstock blend; extruding the pinstock blend to form a green pinstock; baking the green pinstock to form a carbonized pinstock; and graphitizing the carbonized pinstock by maintaining the carbonized pinstock at a temperature of at least about 2500° C. for no more than about 18 hours is presented. The pins prepared by the inventive process are also presented.Type: ApplicationFiled: April 18, 2001Publication date: October 25, 2001Inventors: Richard Liichang Shao, James William Kortovich, Irwin Charles Lewis, Richard Thomas Lewis
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Patent number: 6280663Abstract: A process for preparing pins for connecting carbon electrodes is presented. In particular, a process for preparing pins for connecting carbon electrodes including the steps of combining calcined coke, a liquid pitch binder and carbon fibers derived from mesophase pitch to form a pinstock blend; extruding the pinstock blend to form a green pinstock; baking the green pinstock to form a carbonized pinstock; and graphitizing the carbonized pinstock by maintaining the carbonized pinstock at a temperature of at least about 2500° C. for no more than about 18 hours is presented. The pins prepared by the inventive process are also presented.Type: GrantFiled: February 25, 2000Date of Patent: August 28, 2001Assignee: UCAR Carbon Company Inc.Inventors: Richard Liichang Shao, James William Kortovich, Irwin Charles Lewis, Richard Thomas Lewis
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Patent number: 6214158Abstract: A curable, high temperature, carbonaceous, cement paste composition comprising a catalyst; a carbon filler present in an amount of about 20 to about 60 wt. %; a polymerizable monomeric system present in an amount of about 7 to about 30 wt. % comprising a dialkyl ester of an aromatic tetracarboxylic acid, an aromatic diamine, and a monoalkyl ester of an acid selected from the group consisting of 5-norbornene-2,3-dicarboxylic acid and phthalic acid; and a furan solvent present in an amount of about 20 to about 60 wt. %. The most preferred embodiment comprising a monomeric system comprising a dimethyl ester of 3,3′,4,4′-benzophenonetetracarboxylic acid, 2,2′-bis (4-[4-aminophenoxyl]phenyl)propane and a monomethyl ester of 5-norbornene-2,3-dicarboxylic acid with furfuryl alcohol and a catalytic solution of about 50% ZnCl2, has a glass transition temperature of about 280° C. after curing by heating at about 2° C./minute to about 240° C. and holding for about 2 hours.Type: GrantFiled: February 26, 1999Date of Patent: April 10, 2001Assignee: UCAR Carbon Company Inc.Inventors: Charles Chi-Chieh Chiu, Irwin Charles Lewis, Richard Thomas Lewis
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Patent number: 5756062Abstract: This invention relates to chemically modified graphite particles:(a) that are useful in alkali metal-containing electrode of a electrochemical cell comprising:(i) the electrode,(ii) a non-aqueous electrolytic solution comprising an organic aprotic solvent which solvent tends to decompose when the electrochemical cell is in use, and an electrically conductive salt of an alkali metal, and(iii) a counterelectrode; and(b) that are chemically modified with fluorine, chlorine, iodine or phosphorus to reduce such decomposition.This invention also relates to electrodes comprising such chemically modified graphite and a binder and to electrochemical cells containing such electrodes.Type: GrantFiled: May 29, 1996Date of Patent: May 26, 1998Assignee: Ucar Carbon Technology CorporationInventors: Ronald Alfred Greinke, Irwin Charles Lewis
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Patent number: 5688155Abstract: A unitary composite structure having improved flexural strength and a reduced coefficient of thermal expansion comprising a heterogeneous combination of a carbonaceous reinforcing material interbonded with a matrix material, wherein the said matrix material is a poorly graphitizing carbonaceous pitch containing polymerized and cross-linked aromatic components is disclosed. Graphite electrodes comprised of the poorly graphitized pitch matrix material acting as a binder and/or an impregnant are also disclosed. Processes for the preparation of the poorly graphitizing pitch, the composite structure, and particularly the graphite electrodes are disclosed as well.Type: GrantFiled: January 24, 1995Date of Patent: November 18, 1997Assignee: UCAR Carbon Technology CorporationInventors: Irwin Charles Lewis, Ronald Albert Howard
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Patent number: 5677082Abstract: This invention provides compacted carbon that is useful in the electrode of an alkali metal/carbon electrochemical cell of improved capacity selected from the group consisting of:(a) coke having the following properties:(i) an x-ray density of at least 2.00 grams per cubic centimeters,(ii) a closed porosity of no greater than 5%, and(iii) an open porosity of no greater than 47%; and(b) graphite having the following properties:(i) an x-ray density of at least 2.20 grams per cubic centimeters,(ii) a closed porosity of no greater than 5%, and(iii) an open porosity of no greater than 25%.This invention also relates to an electrode for an alkali metal/carbon electrochemical cell comprising compacted carbon as described above and a binder.Type: GrantFiled: May 29, 1996Date of Patent: October 14, 1997Assignee: UCAR Carbon Technology CorporationInventors: Ronald Alfred Greinke, Irwin Charles Lewis
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Patent number: 5639707Abstract: A sulfur-containing active carbon, which has a high storage capacity for methane, is produced from inexpensive aromatic precursors, such as chrysene, coal tar and petroleum oils, tars and pitches, by reacting the aromatic precursor with elemental sulfur, followed by carbonization of the sulfur-containing reaction product in an inert atmosphere at an elevated temperature to produce a sulfur-containing carbon. The carbon is then further activated to develop a surface area of at least 600 m.sup.2 /g by heating in an oxidizing atmosphere at an elevated temperature.Type: GrantFiled: June 27, 1996Date of Patent: June 17, 1997Assignee: UCAR Carbon Technology CorporationInventors: Irwin Charles Lewis, Ronald Alfred Greinke
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Patent number: 5639576Abstract: This invention relates to an electrode for a coke/alkali metal electrochemical cell comprising:(a) calcined coke particles:(i) that contain at least 0.5 weight percent of nitrogen heteroatoms and at least 1.0 weight percent sulfur heteroatoms, and(ii) that have an average particle size from 2 microns to 40 microns with essentially no particles being greater than 50 microns.(b) a binderThis invention also relates to a coke/alkali metal electrochemical cell comprising:(a) an electrode as described above,(b) a non-aqueous electrolytic solution comprising an organic aprotic solvent and an electrically conductive salt, and(c) a counterelectrode.Type: GrantFiled: May 29, 1996Date of Patent: June 17, 1997Assignee: UCAR Carbon Technology CorporationInventors: Irwin Charles Lewis, Ronald Alfred Greinke
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Patent number: 4032430Abstract: An improved process for producing pitch which has been transformed, in part, to a liquid crystal or so-called "mesophase" state. According to the process, pitch of a given mesophase content, suitable for producing carbon fibers, is produced in substantially shorter periods of time than heretofore possible, at a given temperature, by subjecting the pitch to reduced pressure during formation of the mesophase.Type: GrantFiled: December 11, 1973Date of Patent: June 28, 1977Assignee: Union Carbide CorporationInventor: Irwin Charles Lewis
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Patent number: RE42775Abstract: Insulation materials suited to high temperature applications, such as the insulation of furnaces, are formed from a mixture of pitch carbon fibers, such as isotropic pitch carbon fibers, and a binder comprising a solution of sugar in water. The sugar solution is preferably at a concentration of from 20-60% sucrose to yield a low density material having high flexural strength and low thermal conductivity when carbonized to a temperature of about 1800° C.Type: GrantFiled: November 4, 2008Date of Patent: October 4, 2011Assignee: GrafTech International Holdings Inc.Inventors: Charles C. Chiu, Irwin Charles Lewis, Ching-Feng Chang