Patents by Inventor David B. Mitchell
David B. Mitchell 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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Publication number: 20240151116Abstract: A hanger assembly includes: a main body; a lock ring coupled to the main body and configured to expand radially outward into a profile on an inner diameter of the wellhead; and an actuator, wherein the actuator is capable of transferring an axial force from the actuator into outward radial expansion of the lock ring toward the profile on the inner diameter of the wellhead. An interface between the actuator and the lock ring is shaped such that: axially downward movement of the actuator from a starting position to an intermediate position actuates the lock ring into the profile; and axially downward movement of the actuator from the intermediate position to a pre-load position applies a pre-load to the hanger assembly.Type: ApplicationFiled: January 10, 2024Publication date: May 9, 2024Inventors: Andrew B. Mitchell, Chris D. Bartlett, David Scantlebury, Rick Murphy, Fife B. Ellis, Gregory Norwood
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Patent number: 11407668Abstract: A method for treating wastewater or sludge includes treating a sludge having a first viscosity of from about 3,000 cP to about 15,000 cP by shearing the sludge to obtain a treated sludge having a second viscosity of less than 3,000 cP, where the second viscosity persists for a period of time. The sludge may be thickened by dewatering. A chemical agent may be added to the thickened sludge during, before, or after shearing. The treated sludge may further be pumped, transported, or otherwise handled.Type: GrantFiled: February 8, 2017Date of Patent: August 9, 2022Assignee: ECOLAB USA INC.Inventors: David B. Mitchell, Petia Todorova Tontcheva
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Patent number: 8842796Abstract: A method of detecting defects in nuclear fuel within a fuel rod that first heats the fuel rod to a temperature substantially above the ambient temperature. The surface temperature of the fuel rod cladding is then monitored as the fuel rod is allowed to cool. Variations in the temperature measured over the surface is then noted as an indication of defects.Type: GrantFiled: November 22, 2011Date of Patent: September 23, 2014Assignee: Westinghouse Electric Company LLCInventors: Yuriy Aleshin, David B. Mitchell
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Publication number: 20130129029Abstract: A method of detecting defects in nuclear fuel within a fuel rod that first heats the fuel rod to a temperature substantially above the ambient temperature. The surface temperature of the fuel rod cladding is then monitored as the fuel rod is allowed to cool. Variations in the temperature measured over the surface is then noted as an indication of defects.Type: ApplicationFiled: November 22, 2011Publication date: May 23, 2013Applicant: WESTINGHOUSE ELECTRIC COMPANY LLCInventors: Yuriy Aleshin, David B. Mitchell
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Patent number: 8435409Abstract: The present disclosure relates to methods of treating highly contaminated wastewater using waste activated sludge as an adsorbent.Type: GrantFiled: May 28, 2010Date of Patent: May 7, 2013Assignee: Ecolab USA Inc.Inventors: David B. Mitchell, Daniel J. Wagner, Kojo Arthur-Mensah
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Publication number: 20120263271Abstract: A nuclear fuel pellet design that is a cylindrical axial profile with either a larger radius or conical shaped ends such that the as built diameter at the ends of the pellet are slightly smaller than at the middle and at normal operating conditions, the diameter at the ends is nearly the same as at the middle. Preferably, there are short chamfers at the axial ends of the pellet.Type: ApplicationFiled: April 14, 2011Publication date: October 18, 2012Applicant: WESTINGHOUSE ELECTRIC COMPANY LLCInventors: Yuriy Aleshin, David B. Mitchell
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Publication number: 20110290722Abstract: The present disclosure relates to methods of treating highly contaminated wastewater using waste activated sludge as an adsorbent.Type: ApplicationFiled: May 28, 2010Publication date: December 1, 2011Inventors: David B. Mitchell, Daniel J. Wagner, Kojo Arthur-Mensah
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Patent number: 5904158Abstract: A method of removing layers of heat cured paint buildup on supporting hangers is disclosed. The method includes coating support hangers with a layer of a thermally expandable material in a water soluble carrier and thereafter applying a water insoluble coating layer. The thermally expandable material, the carrier and the water insoluble coating are all selected so as to be relatively unaffected by the curing temperatures of the paint line where the hangers are to be used. When an undesirably thick coating of cured paint has built-up on the hangers, it is removed by heating to a temperature sufficient to expand the thermally expandable material thereby cracking the paint layers. Thereafter, the hangers are soaked in a hot aqueous solution to dissolve the carrier layer and remove the cracked, cured paint layers.Type: GrantFiled: October 22, 1997Date of Patent: May 18, 1999Assignee: BetzDearborn Inc.Inventors: David B. Mitchell, Ralph L. Minnis, Gene V. Wayman, Steven M. DeBoo, Mark J. Deschryver
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Patent number: 5298186Abstract: A composition and method of treating paint spray booth water to detackify organic solvent based paint particles. The composition comprises a melamine polymer obtained from the reaction of melamine, aldehyde and an amine selected from the group consisting of dicyandiamide and glycine. These melamine polymers may be used in combination with a polyacrylamide, which combination exhibits surprising and unexpected effects when used to detackify organic solvent paint particles.Type: GrantFiled: September 11, 1992Date of Patent: March 29, 1994Assignee: W. R. Grace & Co.-Conn.Inventors: David B. Mitchell, Thomas P. Curran, Wun T. Tai, Gary G. Engstrom
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Patent number: 5248449Abstract: This invention relates to a novel method for breaking oil in water emulsions. More specifically, this invention relates to a cationic quarternary ammonium modified blend of a starch and a natural gum, which is effective at breaking oil in water emulsions.Type: GrantFiled: July 14, 1992Date of Patent: September 28, 1993Assignee: W. R. Grace & Co.-Conn.Inventors: David B. Mitchell, Mark W. Salihar
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Patent number: 5248440Abstract: The present invention relates to a novel method for coagulating waterborne paints in paint spray booth recirculating water. The coagulant aid comprises a polynucleate hydroxy silicate-sulphate compound (hereinafter PASS) having the following average composition of the general formula:Al(OH).sub.B (SO.sub.4).sub.C (SiO.sub.X).sub.D (H.sub.2 O).sub.Ewherein B ranges from 0.75 to 2.0; C ranges from 0.30 to 1.12; D ranges from 0.005 to 0.1; X is greater than 2.0 but less or equal to 4.0 such that3=B+2C+2D(X-2)E is 1.5 to 4 when the product is in solid form; and E is larger than 4 when the product is in aqueous form, which may optionally be used together with alum or a mixture of alum and a polyamine. The coagulant aids of this invention may also be used advantageously with detackifying agents to simultaneously detackify and coagulate solvent based paint particles.Type: GrantFiled: January 30, 1992Date of Patent: September 28, 1993Assignee: W. R. Grace & Co.-Conn.Inventors: David B. Mitchell, Thomas P. Curran
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Patent number: 5169562Abstract: This invention relates to a novel composition for breaking oil in water emulsions. More specifically, this invention relates to a cationic quaternary ammonium modified blend of a starch and a natural gum, which is effective at breaking oil in water emulsions.Type: GrantFiled: March 27, 1990Date of Patent: December 8, 1992Assignee: W. R. Grace & Co.-Conn.Inventors: David B. Mitchell, Mark W. Salihar
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Patent number: 4948513Abstract: A novel polymer and treatment scenario which considerably improves detackification of paint overspray consisting of high solids enamel, epoxy resin, or polyurethanes in the wash water or paint spray booths is disclosed comprised of:(i) a hydrophilic-lipophilic copolymer in combination with a modified tannin and/or(ii) a diallyldimethylammonium chloride polymer in combination with a modified tannin.Type: GrantFiled: May 27, 1988Date of Patent: August 14, 1990Assignee: W. R. Grace & Co.-Conn.Inventor: David B. Mitchell
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Patent number: 4913825Abstract: A novel treatment scenario which considerably improves detackification of paint overspray consisting of undiluted high solids enamel, epoxy resin or polyurethanes in the wash water of paint spray booths is disclosed, comprised of (i) a dialkylamine-epihalohydrin in combination with a modified tannin and/or (ii) a dialkylamine epihalohydrin in combination with a melamine formaldehyde type polymer.Type: GrantFiled: May 27, 1988Date of Patent: April 3, 1990Assignee: W. R. Grace & Co.-Conn.Inventor: David B. Mitchell
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Patent number: 4904393Abstract: A composition and method for detackifying paint spray booth water containing particles from paint spray is disclosed which uses a reaction product of an aldehyde with either a urea or an aminotriazine or both, and at least one of;(i) a hydrolyzed polyacrylamide;(ii) certain modified tannins in further combination with diallyldialkyl quaternary ammonium polymers or polymers derived by reacting certain dialkylamines with epihalohydrins.Type: GrantFiled: May 27, 1988Date of Patent: February 27, 1990Assignee: W. R. Grace & Co.-Conn.Inventors: David B. Mitchell, Thomas P. Curran