Patents by Inventor Narsi Devanathan
Narsi Devanathan 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: 20230027209Abstract: An implantable medical device is provided. The device comprises a drug release layer, wherein the drug release layer comprises a naked nucleic acid dispersed within a polymer matrix. The polymer matrix includes an ethylene vinyl acetate copolymer and has a melting temperature of from about 20° C. to about 100° C. as determined in accordance with ASTM D3418-15 and a melt flow index of from about 0.2 to about 100 gram per 10 minutes as determined in accordance with ASTM D1238-20 at a temperature of 190° C. and a load of 2.16 kilograms.Type: ApplicationFiled: September 29, 2022Publication date: January 26, 2023Inventors: Jeffrey C. Haley, Vijay Gyanani, Brian D. Wilson, Harsh Patel, Narsi Devanathan
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Publication number: 20220313725Abstract: An implantable medical device is provided. The device comprises a drug release layer, wherein the drug release layer comprises a naked nucleic acid dispersed within a polymer matrix. The polymer matrix includes an ethylene vinyl acetate copolymer and has a melting temperature of from about 20° C. to about 100° C. as determined in accordance with ASTM D3418-15 and a melt flow index of from about 0.2 to about 100 gram per 10 minutes as determined in accordance with ASTM D1238-20 at a temperature of 190° C. and a load of 2.16 kilograms.Type: ApplicationFiled: March 28, 2022Publication date: October 6, 2022Inventors: Jeffrey C. Haley, Vijay Gyanani, Brian D. Wilson, Harsh Patel, Narsi Devanathan
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Publication number: 20220313616Abstract: An implantable medical device is provided. The device comprises a drug release layer, wherein the drug release layer contains particles dispersed within a polymer matrix. The lipid particles include a carrier component that contains a carrier (e.g., peptide, protein, carbohydrate, lipid, polymer, etc.) and encapsulates a nucleic acid, wherein the polymer matrix includes an ethylene vinyl acetate copolymer. The ratio of the melting temperature of the ethylene vinyl acetate copolymer to the melting temperature of the carrier is about 2° C./° C. or less.Type: ApplicationFiled: March 28, 2022Publication date: October 6, 2022Inventors: Jeffrey C. Haley, Vijay Gyanani, Brian D. Wilson, Harsh Patel, Narsi Devanathan
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Publication number: 20220162423Abstract: A polymer composition containing cellulose acetate in combination with one or more plasticizers and one or more biodegradable fillers. The biodegradable fillers can include monosaccharides, polysaccharides, esters thereof, and mixtures thereof. The polymer composition is formulated so as to have properties similar to petroleum-based polymers for producing, for example, single-use biodegradable articles.Type: ApplicationFiled: November 19, 2021Publication date: May 26, 2022Inventors: Michael Combs, Narsi Devanathan
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Publication number: 20220160026Abstract: Disclosed herein is a tow band comprising cellulose acetate and a filler. The filler may be selected to have a degradation rate greater than that of the cellulose acetate. The tow band may be bloomed and formed into a filter rod, which may then be incorporated into a cigarette filter. The tow, tow band, and filter structures described herein degrade more rapidly than other known tow, tow bands, and filter structures.Type: ApplicationFiled: November 19, 2021Publication date: May 26, 2022Inventors: Michael COMBS, Narsi DEVANATHAN
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Patent number: 9139932Abstract: There is provided a quartz glass article having a surface treated with novel coating materials which provides a reduced chemistry, wherein the quartz glass surface having a reduced chemistry upon exposure to melted silicon or similarly corrosive environments, forms crystalline structures covering at least 30% of the coated surface of the quartz glass crucible. Said crystalline covered surface provides a more stable surface of contact with the silicon melt and the growth of single crystal silicon. In one embodiment of the invention, the coating material comprises at least a methyl group for providing at least one of a hydrogenated and a methylated surface on the coated surface, forming rosette structures, or other crystalline morphologies covering at last 80% of the coated surface. In another embodiment of the invention, the coating material is selected from at least one of an amine, an organosilane halogen and mixtures thereof.Type: GrantFiled: September 7, 2007Date of Patent: September 22, 2015Inventors: Richard Lee Hansen, Theodore P. Kircher, Narsi Devanathan
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Publication number: 20080092804Abstract: There is provided a quartz glass article having a surface treated with novel coating materials which provides a reduced chemistry, wherein the quartz glass surface having a reduced chemistry upon exposure to melted silicon or similarly corrosive environments, forms crystalline structures covering at least 30% of the coated surface of the quartz glass crucible. Said crystalline covered surface provides a more stable surface of contact with the silicon melt and the growth of single crystal silicon. In one embodiment of the invention, the coating material comprises at least a methyl group for providing at least one of a hydrogenated and a methylated surface on the coated surface, forming rosette structures, or other crystalline morphologies covering at last 80% of the coated surface. In another embodiment of the invention, the coating material is selected from at least one of an amine, an organosilane halogen and mixtures thereof.Type: ApplicationFiled: September 7, 2007Publication date: April 24, 2008Inventors: Richard Lee Hansen, Theodore P. Kircher, Narsi Devanathan
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Publication number: 20070151504Abstract: There is provided a quartz glass article having a surface treated with novel coating materials which provides a reduced chemistry, wherein the quartz glass surface having a reduced chemistry upon exposure to melted silicon or similarly corrosive environments, forms crystalline structures covering at least 75% of the coated surface of the quartz glass crucible. Said crystalline covered surface provides a more stable surface of contact with the silicon melt and the growth of single crystal silicon. In one embodiment of the invention, the coating material comprises at least a methyl group for providing at least one of a hydrogenated and a methylated surface on the coated surface, forming rosette structures, or other crystalline morphologies covering at last 80% of the coated surface. In another embodiment of the invention, the coating material is selected from at least one of an amine, an organosilane halogen and mixtures thereof.Type: ApplicationFiled: October 18, 2006Publication date: July 5, 2007Applicant: General Electric CompanyInventors: Richard Hansen, Theodore Kircher, Narsi Devanathan
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Patent number: 6620908Abstract: A method for making 2,6-xylenol is described. One embodiment of the method comprises: preparing a magnesium-based solid catalyst composition by dry-blending basic magnesium carbonate with at least one filler; forming the catalyst composition into a suitable catalyst-shape; calcining the shaped catalyst at a temperature in the range of about 350° C. to about 550° C.; and reacting phenol and methanol in the presence of the catalyst, to form 2,6-xylenol. The level of chlorides in the magnesium carbonate is less than about 250 ppm, and the level of calcium in the magnesium carbonate is less than about 2,500 ppm.Type: GrantFiled: March 11, 2002Date of Patent: September 16, 2003Assignee: General Electric ComapanyInventors: Beth A. Watson, Narsi Devanathan
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Patent number: 6620885Abstract: A copolymer having segments of polyphenylene ether, styrene and/or acrylonitrile, a method for making the copolymer, and a blend of the copolymer with a styrenic resin are provided. The polyphenylene ether segments are derived from polyphenylene ether polymers having at least one end cap that a pair of unsaturated aliphatic carbon atoms, i.e. a carbon—carbon double bond. The copolymer is miscible with styrene/acrylonitrile copolymers.Type: GrantFiled: August 30, 2001Date of Patent: September 16, 2003Assignee: General Electric CompanyInventors: Hua Guo, Narsi Devanathan, Charles Lewis
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Publication number: 20030078363Abstract: A copolymer having segments of polyphenylene ether, styrene and/or acrylonitrile, a method for making the copolymer, and a blend of the copolymer with a styrenic resin are provided. The polyphenylene ether segments are derived from polyphenylene ether polymers having at least one end cap that a pair of unsaturated aliphatic carbon atoms, i.e. a carbon-carbon double bond. The copolymer is miscible with styrene/acrylonitrile copolymers.Type: ApplicationFiled: August 30, 2001Publication date: April 24, 2003Applicant: General Electric CompanyInventors: Hua Guo, Narsi Devanathan, Charles Lewis
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Patent number: 6492300Abstract: A method for preparing a polyphenylene ether resin is described. In one embodiment the method comprises: preparing a magnesium-based alkylation catalyst, by dry-blending at least one filler with a magnesium reagent which yields magnesium oxide upon calcination; calcining the alkylation catalyst; reacting a phenolic compound and an alkyl alcohol in the presence of the alkylation catalyst, to form a 2,6-alkyl-disubstituted phenolic compound; and oxidatively coupling the 2,6-alkyl-disubstituted phenolic compound in the presence of a suitable polymerization catalyst, to form the polyphenylene ether resin.Type: GrantFiled: March 11, 2002Date of Patent: December 10, 2002Assignee: General Electric CompanyInventors: Beth A. Watson, Narsi Devanathan
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Publication number: 20020128431Abstract: A method for preparing a polyphenylene ether resin is described. In one embodiment the method comprises: preparing a magnesium-based alkylation catalyst, by dry-blending at least one filler with a magnesium reagent which yields magnesium oxide upon calcination; calcining the alkylation catalyst; reacting a phenolic compound and an alkyl alcohol in the presence of the alkylation catalyst, to form a 2,6-alkyl-disubstituted phenolic compound; and oxidatively coupling the 2,6-alkyl-disubstituted phenolic compound in the presence of a suitable polymerization catalyst, to form the polyphenylene ether resin.Type: ApplicationFiled: March 11, 2002Publication date: September 12, 2002Inventors: Beth A. Watson, Narsi Devanathan
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Publication number: 20020128432Abstract: A method for making 2,6-xylenol is described. One embodiment of the method comprises: preparing a magnesium-based solid catalyst composition by dry-blending basic magnesium carbonate with at least one filler; forming the catalyst composition into a suitable catalyst-shape; calcining the shaped catalyst at a temperature in the range of about 350° C. to about 550° C.; and reacting phenol and methanol in the presence of the catalyst, to form 2,6-xylenol. The level of chlorides in the magnesium carbonate is less than about 250 ppm, and the level of calcium in the magnesium carbonate is less than about 2,500 ppm.Type: ApplicationFiled: March 11, 2002Publication date: September 12, 2002Inventors: Beth A. Watson, Narsi Devanathan
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Patent number: 6395871Abstract: A method for preparing a solid catalyst composition is described. A magnesium reagent which yields magnesium oxide upon calcination, and which includes reduced levels of chlorides and calcium, is dry-blended with at least one filler. Dry-blending is usually carried out in the absence of a promoter. A method for selectively alkylating at least one hydroxyaromatic compound by using the catalyst is also described. A typical product is 2,6-xylenol. Related processes for preparing polyphenylene ethers are described.Type: GrantFiled: October 18, 2000Date of Patent: May 28, 2002Assignee: General Electric CompanyInventors: Beth A. Watson, Narsi Devanathan
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Patent number: 6306963Abstract: Thermosetting polymers and the electrical laminates made therefrom are disclosed. The laminate comprises a cross-linked product of: a) one or more ethylenically unsaturated aromatic monomers, with fire retardation being optionally contributed by one halogenated monomer, b) a vinyl-terminated polybutadiene or butadiene-styrene copolymer containing either a urethane or an ester group, and c) a chemically modified polyphenylene ether resin, preferably low molecular weight chemically modified polyphenylene ether resin. It has been discovered that an unexpected combination of thermal, electrical, and mechanical properties are obtained from the composition recited herein. Therefore, the composition is ideally suited as a matrix polymer for electrical substrate applications.Type: GrantFiled: September 7, 2000Date of Patent: October 23, 2001Assignees: General Electric Co., GIL TechnologyInventors: Scott A. Lane, Timothy W. Austill, Donald C. Rollen, Herbert Shin-I Chao, Kenneth P. Zarnoch, Hua Guo, David Parrillo, David Peter Reis, Narsi Devanathan, Benny David
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Patent number: 6294499Abstract: A method for preparing a solid catalyst composition is described. A magnesium reagent which yields magnesium oxide upon calcination, and which includes reduced levels of chlorides and calcium, is dry-blended with at least one filler. Dry-blending is usually carried out in the absence of a promoter. A method for selectively alkylating at least one hydroxyaromatic compound by using the catalyst is also described. A typical product is 2,6-xylenol. Related processes for preparing polyphenylene ethers are described.Type: GrantFiled: October 20, 2000Date of Patent: September 25, 2001Assignee: General Electric CompanyInventors: Beth A. Watson, Narsi Devanathan
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Patent number: 6261987Abstract: A method for preparing a solid catalyst composition is described. A magnesium reagent which yields magnesium oxide upon calcination, and which includes reduced levels of chlorides and calcium, is dry-blended with at least one filler. Dry-blending is usually carried out in the absence of a promoter. A method for selectively alkylating at least one hydroxyaromatic compound by using the catalyst is also described. A typical product is 2,6-xylenol. Related processes for preparing polyphenylene ethers are described.Type: GrantFiled: February 29, 2000Date of Patent: July 17, 2001Assignee: General Electric CompanyInventors: Beth A. Watson, Narsi Devanathan