Patents by Inventor Ramesh Krishnamurti
Ramesh Krishnamurti 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: 7321069Abstract: A process for preparing aromatic bisphenols, wherein the method comprises reacting an aromatic hydroxy compound with an alkylating agent having a functionality of two in the presence of a catalyst system. The catalyst system used for the process is selected from the group consisting of a heteropolyacid compound, a clay, a functionalized metal oxide catalyst and combinations of the foregoing.Type: GrantFiled: December 17, 2004Date of Patent: January 22, 2008Assignee: General Electric CompanyInventors: Gurram Kishan, Ramesh Krishnamurti, Kapila Debjani, Arakali Radhakrishna Srinivasarao, Jan-Pleun Lens
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Patent number: 7112702Abstract: A commercial scale continuous process for the production of a bisphenol comprising reacting a phenol and a ketone in the presence of a modified ion exchange resin catalyst, wherein said modified ion exchange resin comprises a crosslinked gellular acid functionalized polystyrene resin modified by neutralization of with a mercapto promoter.Type: GrantFiled: December 12, 2002Date of Patent: September 26, 2006Assignee: General Electric CompanyInventors: Brian Carvill, Katherine Glasgow, Gurram Kishan, Ramesh Krishnamurti, Nilesh Kumar Parkash Kukalyekar, G. V. Ramanarayanan
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Publication number: 20060135825Abstract: A process for preparing aromatic bisphenols, wherein the method comprises reacting an aromatic hydroxy compound with an alkylating agent having a functionality of two in the presence of a catalyst system. The catalyst system used for the process is selected from the group consisting of a heteropolyacid compound, a clay, a functionalized metal oxide catalyst and combinations of the foregoing.Type: ApplicationFiled: December 17, 2004Publication date: June 22, 2006Inventors: Gurram Kishan, Ramesh Krishnamurti, Kapila Debjani, Arakali Srinivasarao, Jan-Pleun Lens
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Patent number: 7015365Abstract: A process for forming a cycloalkylidene bisphenol comprises: reacting a cycloalkanone compound of formula: where [A] is a substituted or an unsubstituted aromatic group, R1–R4 independently represent a hydrogen or a C1–C12 hydrocarbyl group; and “a” and “b” are integers independently having values from 0–3; with an aromatic hydroxy compound of formula [A]-OH, where [A] is as previously described; at a mole ratio of greater than or equal to about 20, in the presence of a sulfonic acid type ion exchange resin catalyst crosslinked with greater than or equal to about 8 weight percent of divinylbenzene, and a promoter selected from the group consisting of a mercaptan compound and a resorcinol compound; to form a cycloalkylidene bisphenol of formula: where [A], R1–R4, “a” and “b” are as previously described. Moreover, any acid catalyst can be used with a resorcinol promoter.Type: GrantFiled: December 19, 2003Date of Patent: March 21, 2006Assignee: General Electric CompanyInventors: Debjani Kapila, Ramesh Krishnamurti, Jan-Pleun Lens, Gurram Kishan, Nileshkumar Kukalyekar, Jegadeesh Thampi, Umesh Krishna Hasyagar, Vinod Kumar Rai, Ashok S. Shyadligeri, Radhakrishna Sreenivasarao Arakali, Edward J. Nesakumar, Pramod Kumbhar
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Publication number: 20050137428Abstract: A process for forming a cycloalkylidene bisphenol comprises: reacting a cycloalkanone compound of formula: where [A] is a substituted or an unsubstituted aromatic group, R1-R4 independently represent a hydrogen or a C1-C12 hydrocarbyl group; and “a” and “b” are integers independently having values from 0-3; with an aromatic hydroxy compound of formula [A]-OH, where [A] is as previously described; at a mole ratio of greater than or equal to about 20, in the presence of a sulfonic acid type ion exchange resin catalyst crosslinked with greater than or equal to about 8 weight percent of divinylbenzene, and a promoter selected from the group consisting of a mercaptan compound and a resorcinol compound; to form a cycloalkylidene bisphenol of formula: where [A], R1-R4, “a” and “b” are as previously described. Moreover, any acid catalyst can be used with a resorcinol promoter.Type: ApplicationFiled: December 19, 2003Publication date: June 23, 2005Inventors: Debjani Kapila, Ramesh Krishnamurti, Jan-Pleun Lens, Gurram Kishan, Nileshkumar Kukalyekar, Jegadeesh Thampi, Umesh Hasyagar, Vinod Rai, Ashok Shyadligeri, Radhakrishna Arakali, Edward Nesakumar, Pramod Kumbhar
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Patent number: 6790918Abstract: Disclosed is a novel bidentate pyridine transition metal catalyst having the general formula each R is independently selected from hydrogen or C1 to C6 alkyl, or C6 to C14 aryl, each R′ is independently selected from R, C1 to C6 alkoxy, C6 to C14 aryl, C7 to C20 alkaryl, C7 to C20 aralkyl, halogen, or CF3, M is a Group 3 to 10 metal, each X is independently selected from halogen, C1 to C6 alkyl, C6 to C14 aryl, C7 to C20 alkaryl, C7 to C20aralkyl, C1 to C6 alkoxy, or L is X, cyclopentadienyl, C1 to C6 alkyl substituted cyclopentadienyl, indenyl, fluorenyl, or “n” is 1 to 4; “a” is 1 to 3; “b” is 0 to 2; a+b≦3; “c” is 1 to 6; and a+b+c equals the oxidation state of M.Type: GrantFiled: June 30, 2003Date of Patent: September 14, 2004Assignee: Equistar Chemicals, LPInventors: Sandor Nagy, Leonard V. Cribbs, Bradley P. Etherton, Mary Cocoman, Ramesh Krishnamurti, John A. Tyrell
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Patent number: 6759493Abstract: Disclosed is a novel bidentate pyridine transition metal catalyst having the general formula where each R is independently hydrogen, C1-6 alkyl, or C6-14 aryl; where each R′ is independently R, C1-6 alkoxy, C7-20 alkaryl, C7-20 aralkyl, halogen, or CF3; where M is a Group 3 to 10 metal; where each X is independently halogen, C1-6 alkyl, C6-14 aryl, C7-20 alkaryl, C7-20 aralkyl, C1-6 alkoxy, or L is X, cyclopentadienyl, C1-16 alkyl-substituted cyclopentadienyl, fluorenyl, indenyl, or where n is an integer from 1 to 4; a is an integer from 1 to 3; b is an integer from 0 to 2; the sum of a+b≦3; c is an integer from 1 to 6; and the sum a+b+c equals the oxidation state of M.Type: GrantFiled: June 10, 1997Date of Patent: July 6, 2004Assignee: Equistar Chemicals, LPInventors: Sandor Nagy, Leonard V. Cribbs, Bradley P. Etherton, Mary Cocoman, Ramesh Krishnamurti, John A. Tyrell
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Publication number: 20040116751Abstract: A commercial scale continuous process for the production of a bisphenol comprising reacting a phenol and a ketone in the presence of a modified ion exchange resin catalyst, wherein said modified ion exchange resin comprises a crosslinked gellular acid functionalized polystyrene resin modified by neutralization of with a mercapto promoter.Type: ApplicationFiled: December 12, 2002Publication date: June 17, 2004Inventors: Brian Carvill, Katherine Glasgow, Gurram Kishan, Ramesh Krishnamurti, Nilesh Kumar Parkash Kukalyekar, G.V. Ramanarayanan
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Publication number: 20040097670Abstract: Disclosed is a novel bidentate pyridine transition metal catalyst having the general formula 1Type: ApplicationFiled: June 30, 2003Publication date: May 20, 2004Applicant: EQUISTAR CHEMICALS, LPInventors: Sandor Nagy, Leonard V. Cribbs, Bradley P. Etherton, Mary Cocoman, Ramesh Krishnamurti, John A. Tyrell
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Patent number: 6646097Abstract: A method for purifying 1,1-bis(4′-hydroxy-3′-methylphenyl)cyclohexane comprises dissolving said 1,1-bis(4′-hydroxy-3′-methylphenyl)cyclohexane in a first solvent consisting essentially of an alcohol to form a first solution; filtering said first solution; adding a second solvent consisting essentially of water to the filtered first solution to form a second solution, wherein said second solution comprises about 40 parts to about 95 parts of the first solvent per 100 parts of the combined weight of the first and second solvents; crystallizing said 1,1-bis(4′-hydroxy-3′-methylphenyl) cyclohexane from said second solution to form a first crystalline product; dissolving said first crystalline product in a third solvent to form a third solution, wherein the third solvent comprises an aromatic compound; and crystallizing said 1,1-bis(4′-hydroxy-3′-methylphenyl)cyclohexane from said third solution to produce a second crystalline product.Type: GrantFiled: October 31, 2002Date of Patent: November 11, 2003Assignee: General Electric CompanyInventors: Ashok Shyadligeri, Gary C. Davis, Debjani Kapila, Ramesh Krishnamurti, A. S. Radhakrishna, Veeraraghavan Srinivasan
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Patent number: 6593498Abstract: The present invention provided an improved method for preparing a boratabenzene derivative. The invention includes an improved preparation of 1,4-pentadiyne, 1-haloboracyclohexa-2,5-diene, and 1-methylboracyclohexa-2,5-diene intermediates. These compounds are chemically labile and are not directly isolated from solution. Furthermore, the invention discloses an improved preparation of 1,1-dialkylstannacyclohexa-2,5-diene, another intermediate useful for preparing boratabenzene derivatives.Type: GrantFiled: August 8, 2001Date of Patent: July 15, 2003Assignee: Equistar Chemicals, L.P.Inventors: Vladimir Dragan, Ramesh Krishnamurti
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Publication number: 20030055289Abstract: The present invention provided an improved method for preparing a boratabenzene derivative. The invention includes an improved preparation of 1,4-pentadiyne, 1-haloboracyclohexa-2,5-diene, and 1-methylboracyclohexa-2,5-diene intermediates. These compounds are chemically labile and are not directly isolated from solution. Furthermore, the invention discloses an improved preparation of 1,1-dialkylstannacyclohexa-2,5-diene, another intermediate useful for preparing boratabenzene derivatives.Type: ApplicationFiled: August 8, 2001Publication date: March 20, 2003Applicant: Equistar Chemicals, L.P.Inventors: Vladimir Dragan, Ramesh Krishnamurti
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Patent number: 6506854Abstract: Disclosed is a solution that comprises (A) a solvent; (B) about 0.001 to about 20 wt % of a terpolymer that comprises the condensation reaction product of (1) an aromatic compound that contains a benzene or naphthalene ring substituted with the group OR or SR, where R is hydrogen, alkyl from C1 to C15, or aryl, alkaryl, or aralkyl from C6 to C15; (2) about 0.1 to about 10 moles of a carbonyl compound per mole of said aromatic compound; and (3) about 0.1 to about 10 moles of a thiourea per mole of said aromatic compound (C) about 1 to about 5 wt % of a base; (D) about 0.1 wt % to saturation of a salt; and (E) 0 to about 20 wt % of an alcohol. Also disclosed is a method of making the terpolymer in the absence of an acid catalyst and a method of inhibiting the formation of scale on reactor components in contact with polymerizing vinyl chloride monomer.Type: GrantFiled: May 22, 2001Date of Patent: January 14, 2003Assignee: Occidental Chemical CorporationInventors: Ramesh Krishnamurti, Sandor Nagy, Qi Wang, Habib Hichri
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Publication number: 20020055654Abstract: A method for producing benzyl derivatives of 2-butene-1,4-diols by reacting 2-butene-1,4-diols with benzyl chloride compounds in the presence of an alkali or alkaline earth metal hydroxide or carbonate to produce benzyl derivatives of 2-butene-1,4-diols and recovering at least a portion of at least one such benzene derivative.Type: ApplicationFiled: September 10, 2001Publication date: May 9, 2002Inventors: Qi Wang, Ramesh Krishnamurti, Thomas F. Smolka
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Patent number: 6376629Abstract: A single-site olefin polymerization catalyst and method of making it are disclosed. The catalyst comprises an activator and an organometallic complex. The complex comprises a Group 3 to 10 transition or lanthanide metal, M, and at least one indenoindolyl ligand that is &pgr;-bonded to M. The key ligand is made in two steps from readily available indanones and aryl hydrazines. Reaction of its anion with a source of the metal completes a remarkably simple synthetic route to a new family of single-site olefin polymerization catalysts.Type: GrantFiled: January 29, 2001Date of Patent: April 23, 2002Assignee: Equistar Chemicals, LPInventors: Sandor Nagy, Bradley P. Etherton, Ramesh Krishnamurti, John A. Tyrell
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Publication number: 20020015692Abstract: Disclosed is a solution that comprisesType: ApplicationFiled: May 22, 2001Publication date: February 7, 2002Inventors: Ramesh Krishnamurti, Sandor Nagy, Qi Wang, Habib Hichri
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Patent number: 6300427Abstract: Disclosed is a method of inhibiting the formation of scale on reactor surfaces in contact with a polymerizing vinyl monomer comprising contacting said monomer with a terpolymer which comprises the condensation reaction product of (A) an aromatic compound that contains the group where Q is OR or SR and R is hydrogen, alkyl from C1 to C15, or aryl, alkaryl, or aralkyl from C6 to C15: (B) about 0.1 to about 10 moles of a carbonyl compound per mole of said aromatic compound; and (C) about 0.1 to about 10 moles of a thiourea per mole of said aromatic compound.Type: GrantFiled: January 4, 2000Date of Patent: October 9, 2001Assignee: Occidental Chemical CorporationInventors: Ramesh Krishnamurti, Sandor Nagy, Qi Wang, Bib Hichri
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Publication number: 20010018502Abstract: A single-site olefin polymerization catalyst is described. The catalyst comprises an activator and an organometallic compound that includes an amine derivative ligand. The catalyst is highly productive, incorporates comonomers well, and gives polymers with narrow molecular weight distributions.Type: ApplicationFiled: January 16, 2001Publication date: August 30, 2001Applicant: EQUISTAR CHEMICALS, L.P.Inventors: Sandor Nagy, Bradley P. Etherton, Ramesh Krishnamurti, John A. Tyrell
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Patent number: 6281308Abstract: Olefin polymerization is performed in the presence of a catalyst comprising a compound of the formula wherein M is a Group 3-10 transition metal; A is O, S, N—R″, or P—R″; L is an anionic ligand; X is hydride, halide, C1-C20 alkoxy, siloxy, hydrocarbyl, or dialkylamido; R, R′, and R″, which are the same or different, are selected from the group consisting of hydrogen and C1-C20 hydrocarbyl; and m+n equals the valency of M minus 1; and an activator.Type: GrantFiled: January 16, 2001Date of Patent: August 28, 2001Assignee: Equistar Chemicals, L.P.Inventors: Sandor Nagy, Bradley P. Etherton, Ramesh Krishnamurti, John A. Tyrell
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Publication number: 20010007848Abstract: A single-site olefin polymerization catalyst and method of making it are disclosed. The catalyst comprises an activator and an organometallic complex. The complex comprises a Group 3 to 10 transition or lanthanide metal, M, and at least one indenoindolyl ligand that is -bonded to M. The key ligand is made in two steps from readily available indanones and aryl hydrazines. Reaction of its anion with a source of the metal completes a remarkably simple synthetic route to a new family of single-site olefin polymerization catalysts.Type: ApplicationFiled: January 29, 2001Publication date: July 12, 2001Applicant: EQUISTAR CHEMICALS, L.P.Inventors: Sandor Nagy, Bradley P. Etherton, Ramesh Krishnamurti, John A. Tyrell