Patents by Inventor Ganesh Kailasam
Ganesh Kailasam 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: 6548623Abstract: Polycarbonates containing low or undetectable levels of Fries rearrangement product may be prepared by the melt reaction of a dihydroxy aromatic compound such as bisphenol A with an ester-substituted diaryl carbonate such as the diaryl carbonate of methyl salicylate, bis-methyl salicyl carbonate. Low levels of Fries product are obtained as the combined result of a highly effective catalyst system which suppresses the Fries reaction and the use of lower melt polymerization temperatures relative to temperatures required for the analogous polymerization reaction using diphenyl carbonate.Type: GrantFiled: July 24, 2001Date of Patent: April 15, 2003Assignee: General Electric CompanyInventors: Daniel Joseph Brunelle, Patrick Joseph McCloskey, Paul Michael Smigelski, Jr., Timothy Brydon Burnell, Ganesh Kailasam
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Publication number: 20030060649Abstract: High yields of ester-substituted diary carbonates such as bis-methyl salicyl carbonate were obtained by the condensation of ester-substituted phenols with phosgene in the presence of a phase transfer catalyst (PTC) and optionally a tertiary amine catalyst in a solvent free reaction system comprising an aqueous phase held at a pH of 8.3 or higher. The optimized conditions of the present invention use an excess of ester-substituted phenol relative to phosgene and high conversion of phosgene to ester-substituted diaryl carbonate is observed. The product ester-substituted diaryl carbonate may be conveniently isolated as a solid by filtration or as a liquid in which the excess ester-substituted phenols serves as solvent. The method represents an attractive route for the manufacture of bis methyl salicyl carbonate and ester-substituted diaryl carbonates generally. The ester-substituted diaryl carbonates are useful for the preparation and modification of polycarbonates.Type: ApplicationFiled: August 12, 2002Publication date: March 27, 2003Applicant: General Electric CompanyInventors: Timothy Brydon Burnell, Patrick Joseph McCloskey, Ganesh Kailasam, James Anthony Cella
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Publication number: 20030060650Abstract: Unexpected corrosion of downstream sections of a dialkyl carbonate manufacturing apparatus has been traced to alkyl chloroformate impurities, which slowly decompose to yield hydrochloric acid. An improved process and apparatus for dialkyl carbonate synthesis reduce corrosion by physically removing or chemically decomposing the alkyl chloroformate impurities within the corrosion-resistant upstream sections of the apparatus.Type: ApplicationFiled: August 14, 2001Publication date: March 27, 2003Inventors: Eugene Pauling Boden, Ganesh Kailasam, Larry Neil Lewis, Alberto Nisoli, John Yaw Ofori, Angel Sanchez Gonzalez, Ignacio Vic Fernandez
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Publication number: 20030050427Abstract: Polycarbonates containing low or undetectable levels of Fries rearrangement product may be prepared by the melt reaction of a dihydroxy aromatic compound such as bisphenol A with an ester-substituted diaryl carbonate such as the diaryl carbonate of methyl salicylate, bis-methyl salicyl carbonate. Low levels of Fries product are obtained as the combined result of a highly effective catalyst system which suppresses the Fries reaction and the use of lower melt polymerization temperatures relative to temperatures required for the analogous polymerization reaction using diphenyl carbonate.Type: ApplicationFiled: July 24, 2001Publication date: March 13, 2003Applicant: General Electric CompanyInventors: Daniel Joseph Brunelle, Patrick Joseph McCloskey, Paul Michael Smigelski, Timothy Brydon Burnell, Ganesh Kailasam
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Patent number: 6489372Abstract: Polymer are removed from organic solvent-polymer mixtures by preparing a liquid-liquid dispersion of finely dispersed solvent droplets containing polymer in water, adding this liquid-liquid dispersion to a stirred vessel containing water or other suitable liquid and rapidly evaporating the solvent to produce a slurry of the polymer in a liquid from which the solid polymer particles are recovered.Type: GrantFiled: October 17, 2000Date of Patent: December 3, 2002Assignee: General Electric CompanyInventors: Qiwei He, Paul Russell Wilson, Paul William Buckley, Allen Wai Yee Ko, Larry Allen Divins, William Lee Gately, Ganesh Kailasam
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Patent number: 6469192Abstract: High yields of ester-substituted diary carbonates such as bis-methyl salicyl carbonate were obtained by the condensation of ester-substituted phenols with phosgene in the presence of a phase transfer catalyst (PTC) and optionally a tertiary amine catalyst in a solvent free reaction system comprising an aqueous phase held at a pH of 8.3 or higher. The optimized conditions of the present invention use an excess of ester-substituted phenol relative to phosgene and high conversion of phosgene to ester-substituted diaryl carbonate is observed. The product ester-substituted diaryl carbonate may be conveniently isolated as a solid by filtration or as a liquid in which the excess ester-substituted phenols serves as solvent. The method represents an attractive route for the manufacture of bis methyl salicyl carbonate and ester-substituted diaryl carbonates generally.Type: GrantFiled: July 24, 2001Date of Patent: October 22, 2002Assignee: General Electric CompanyInventors: Timothy Brydon Burnell, Patrick Joseph McCloskey, Ganesh Kailasam, James Anthony Cella
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Publication number: 20020151675Abstract: Aromatic polyethers are prepared by displacement polymerization reaction in the presence of a water-immiscible solvent with boiling point at atmospheric pressure of greater than 110° C. and a density ratio to water of greater than 1.1:1 at 20-25° C. The polyethers are purified by processes comprising aqueous extraction, or filtration, or a combination thereof.Type: ApplicationFiled: December 21, 2001Publication date: October 17, 2002Inventors: Norman Enoch Johnson, Raul Eduardo Ayala, Thomas Joseph Fyvie, Amy Rene Freshour, David Winfield Woodruff, Peter David Phelps, Ganesh Kailasam, Paul Edward Howson, Elliott West Shanklin, Lioba Maria Kloppenburg, David Bruce Hall, Pradeep Jeevaji Nadkarni
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Patent number: 6420588Abstract: High yields of ester-substituted diary carbonates such as bis-methyl salicyl carbonate were obtained by the condensation of methyl salicylate with phosgene in the presence of a phase transfer catalyst (PTC) in an interfacial reaction system in which the pH of the aqueous phase was greater than 9.3. Using the method of the present invention conversions of greater than 99% were obtained whereas under standard conditions using triethylamine as the catalyst conversions were limited to 70-75% of the methyl salicylate starting material even with a 20 mole % excess of added phosgene. The optimized conditions of the of the present invention use only a slight excess of phosgene and represent an attractive route for the manufacture of bis methyl salicyl carbonate and ester-substituted diaryl carbonates generally.Type: GrantFiled: July 24, 2001Date of Patent: July 16, 2002Assignee: General Electric CompanyInventors: Patrick Joseph McCloskey, Timothy Brydon Burnell, Daniel Joseph Brunelle, Elliott West Shanklin, Paul Michael Smigelski, Jr., Ganesh Kailasam
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Patent number: 6265521Abstract: Polyether polymers such as polyetherimides are prepared by a two-step reaction. The first step is the reaction between an alkali metal salt of a dihydroxy-substituted aromatic hydrocarbon, such as bisphenol A disodium salt, and a substituted aromatic compound such as 1,3-bis[N-(4-chlorophthalimido)]benzene, the alkali metal salt being employed in an amount less than stoichiometric. The intermediate low molecular weight polymer thus produced then undergoes reaction with additional alkali metal salt. By this method, a polyether polymer of closely controlled molecular weight can be conveniently prepared.Type: GrantFiled: August 7, 2000Date of Patent: July 24, 2001Assignee: General Electric CompanyInventors: Thomas Joseph Fyvie, Peter David Phelps, Paul Edward Howson, Donald Frank Rohr, Ganesh Kailasam, Elliott West Shanklin
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Patent number: 6235866Abstract: Bis(halophthalimides) such as, 3-bis[N-(4-chlorophthalimido)]benzene are prepared in slurry in an organic liquid such as o-dichlorobenzene or anisole, by a reaction at a temperature of at least 150° C. between at least one diamino compound, preferably an aromatic diamine such as m- or p-phenylenediamine, and at least one halophthalic anhydride such as 4-chlorophthalic anhydride, in the presence of an imidization catalyst such as sodium phenylphosphinate. The solids content of the reaction mixture is at least about 5% and preferably at least about 12% by weight. The product slurry may be employed directly in the preparation of polyetherimides, and similar slurries may be employed to prepare other polyether polymers.Type: GrantFiled: October 6, 1999Date of Patent: May 22, 2001Assignee: General Electric CompanyInventors: Farid Fouad Khouri, Ganesh Kailasam, Joseph John Caringi, Peter David Phelps, Paul Edward Howson
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Patent number: 5981788Abstract: Catalytic materials including divalent palladium compounds, divalent cobalt compounds and bromide sources such as tetraalkylammonium and hexaalkylguanidinium bromides are removed from organic carbonylation reaction mixtures comprising said materials in combination with diaryl carbonate and hydroxyaromatic compound. The removal steps include extraction with an aqueous complexing solution for palladium, extraction with an aqueous non-basic and preferably ionic extractant for cobalt, and extraction with water to remove bromide source. These steps may be combined into an integrated process. Further steps of recycle of the palladium by reduction to elemental palladium and conversion to a catalytically active species, and conversion of cobalt to a catalytically active species, may be included in the integrated process.Type: GrantFiled: November 3, 1997Date of Patent: November 9, 1999Assignee: General Electric CompanyInventors: John Yaw Ofori, Sheldon Jay Shafer, Eric James Pressman, Ganesh Kailasam, Julia Lam Lee
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Patent number: 5668186Abstract: The invention relates to a novel process for depolymerizing polyesters by subjecting the polyesters to catalysts and organic solvents which are substantially free of oxygen and water in order to produce macrocyclic polyester oligomers substantially free of hydroxybutyl terminated linear impurities.Type: GrantFiled: March 20, 1996Date of Patent: September 16, 1997Assignee: General Electric CompanyInventors: Daniel Joseph Brunelle, Ganesh Kailasam, Judith Ann Serth-Guzzo, Paul Russell Wilson
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Patent number: 5489381Abstract: A novel apparatus for isolating solids, slurries or wetcakes from fluids is disclosed. Said apparatus comprises an extruder having a dynamic seal and a barrel comprising a slip joint and a floating auger which allows for solid recovery under pressure in the absence of substantial solvent volatilization.Type: GrantFiled: August 1, 1994Date of Patent: February 6, 1996Assignee: General Electric CompanyInventors: James Day, Ganesh Kailasam, Godavarthi S. Varadarajan
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Patent number: 5480540Abstract: A novel apparatus for separating solids from fluids is closed to the atmosphere and comprises a spray feed inlet, a distributor cup and a heat exchanger and it allows for solid recovery under pressure without requiring substantial solvent volatilization.Type: GrantFiled: October 17, 1994Date of Patent: January 2, 1996Assignee: General Electric CompanyInventors: James Day, Ganesh Kailasam, Godavarthi S. Varadarajan
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Patent number: 5480541Abstract: A novel apparatus for isolating solids, slurries or wetcakes from fluids is disclosed. Said novel apparatus comprises an extruder having a dynamic seal and a barrel comprising an auger and a movable cap which allows for solid recovery under pressure in the absence of substantial solvent volatilization.Type: GrantFiled: August 1, 1994Date of Patent: January 2, 1996Assignee: General Electric CompanyInventors: James Day, Ganesh Kailasam, Godavarthi S. Varadarajan
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Patent number: 5466370Abstract: A novel apparatus for isolating solids or wetcakes from fluids is disclosed. Said apparatus is closed to the atmosphere and comprises a torque sensor and movable cap which allows for solid recovery under pressure without requiring substantial solvent volatilization.Type: GrantFiled: June 30, 1994Date of Patent: November 14, 1995Assignee: General Electric CompanyInventors: James Day, Ganesh Kailasam, Godavarthi S. Varadarajan
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Patent number: 5417854Abstract: A novel apparatus for isolating solids or wetcakes from fluids is disclosed. Said apparatus is closed to the atmosphere and comprises a slip joint and a floating auger which allows for solid recovery under pressure in the absence of substantial solvent volatilization.Type: GrantFiled: December 29, 1993Date of Patent: May 23, 1995Assignee: General Electric CompanyInventors: James Day, Ganesh Kailasam, Godavarthi S. Varadarajan, Kenneth M. Carroll
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Patent number: 5306807Abstract: A process for isolating high bulk density polymer resins from polymer resin solutions is provided herein. More particularly, a polymer resin having a glass transition temperature of greater than about ambient temperature is isolated from a polymer resin solution by subjecting the polymer resin solution a gaseous component under moderate pressure and ambient temperature.Type: GrantFiled: July 30, 1993Date of Patent: April 26, 1994Assignee: General Electric CompanyInventors: Ganesh Kailasam, Godavarthi S. Varadarajan