Patents by Inventor Nayan H. Joshi
Nayan H. Joshi 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).
-
Publication number: 20190337022Abstract: To achieve efficient stripping of organic coatings from sensitive substrate without affecting the substrate surface, a novel non-aqueous stripping composition and method are provided. The stripping composition comprises: A. at least one high-boiling solvent selected from the group, consisting of alcohols having general chemical formula R—OH, wherein R is a C4-C30 hydrocarbon group, wherein the high-boiling solvent has a boiling point of at least 100° C.; B— at least one high-boiling co-solvent selected from the group, consisting of high-boiling glycols, glycol ethers and amine compounds, wherein the high-boiling co-solvent has a boiling point of at least 100° C.; and C— at least one pH-active agent either selected from the group, consisting of acid compounds or selected from the group, consisting of hydroxide compounds.Type: ApplicationFiled: May 8, 2017Publication date: November 7, 2019Inventor: Nayan H. JOSHI
-
Patent number: 10456813Abstract: To achieve efficient stripping of organic coatings from sensitive substrate without affecting the substrate surface, a novel non-aqueous stripping composition and method are provided. The stripping composition comprises: A. at least one high-boiling solvent selected from the group, consisting of alcohols having general chemical formula R—OH, wherein R is a C4-C30 hydrocarbon group, wherein the high-boiling solvent has a boiling point of at least 100° C.; B—at least one high-boiling co-solvent selected from the group, consisting of high-boiling glycols, glycol ethers and amine compounds, wherein the high-boiling co-solvent has a boiling point of at least 100° C.; and C—at least one pH-active agent either selected from the group, consisting of acid compounds or selected from the group, consisting of hydroxide compounds.Type: GrantFiled: May 8, 2017Date of Patent: October 29, 2019Assignee: Atotech Deutschland GmbHInventor: Nayan H. Joshi
-
Patent number: 9593247Abstract: The invention relates to a non-aqueous stripping composition for removing cured organic paint from substrates comprising i. a source of hydroxide ions; ii. a high-boiling alcohol having a boiling point of at least 100° C.; and iii. at least one surfactant represented by the following formula R—O—(CH2CH2O)nH and ?wherein R is an alkyl chain, linear or branched having a 2 to 24 carbon atom chain length.Type: GrantFiled: February 11, 2013Date of Patent: March 14, 2017Assignee: Atotech Deutschland GmbHInventors: Nayan H. Joshi, Kerri Little Carver, Thomas Anthony Patena, Christopher George Ringholz
-
Publication number: 20140373878Abstract: The invention relates to a non-aqueous stripping composition for removing cured organic paint from substrates comprising i. a source of hydroxide ions; ii. a high-boiling alcohol having a boiling point of at least 100° C.; and iii. at least one surfactant represented by the following formula R—O—(CH2CH2O)nH and wherein R is an alkyl chain, linear or branched having a 2 to 24 carbon atom chain length.Type: ApplicationFiled: February 11, 2013Publication date: December 25, 2014Applicant: Atotech Deutschland GmbHInventors: Nayan H. Joshi, Kerri Little Carver, Thomas Anthony Patena, Christopher George Ringholz
-
Patent number: 8231743Abstract: Improved compositions and processes for zincating magnesium and magnesium alloy substrates. An aqueous zincating composition having a pH of from about 8 to about 11 and including zinc ions, a complexing agent, fluoride ions and a reducing agent. A non-electrolytic process for zincating a magnesium or magnesium alloy substrate, including immersing the substrate in the non-electrolytic aqueous zincating composition for a time sufficient to deposit a zincate on the substrate. A non-electrolytic process for zincating a magnesium or magnesium alloy substrate, including preparing a aqueous non-electrolytic composition comprising zinc ions, a complexing agent, fluoride ions and a pH in the range from about 8 to about 11; adding to the composition an amount of a reducing agent sufficient to improve deposition of zincate on the magnesium or magnesium alloy substrate; and immersing the substrate in a composition for a time sufficient to deposit the zincate on the substrate.Type: GrantFiled: October 22, 2009Date of Patent: July 31, 2012Assignee: Atotech Deutschland GmbHInventors: Jacob Grant Wiles, Nayan H. Joshi
-
Publication number: 20110094631Abstract: Improved compositions and processes for zincating magnesium and magnesium alloy substrates. An aqueous zincating composition having a pH of from about 8 to about 11 and including zinc ions, a complexing agent, fluoride ions and a reducing agent. A non-electrolytic process for zincating a magnesium or magnesium alloy substrate, including immersing the substrate in the non-electrolytic aqueous zincating composition for a time sufficient to deposit a zincate on the substrate. A non-electrolytic process for zincating a magnesium or magnesium alloy substrate, including preparing a aqueous non-electrolytic composition comprising zinc ions, a complexing agent, fluoride ions and a pH in the range from about 8 to about 11; adding to the composition an amount of a reducing agent sufficient to improve deposition of zincate on the magnesium or magnesium alloy substrate; and immersing the substrate in a composition for a time sufficient to deposit the zincate on the substrate.Type: ApplicationFiled: October 22, 2009Publication date: April 28, 2011Inventors: Jacob Grant Wiles, Nayan H. Joshi
-
Patent number: 7407689Abstract: The present invention provides a non-cyanide aqueous acidic immersion plating solution having a pH of from about 3.5 to about 6.5 and comprising zinc ions, nickel ions and/or cobalt iron ions, and fluoride ions. In one embodiment the immersion plating solutions of the invention also contain at least one inhibitor containing one or more nitrogen atoms, sulfur atoms, or both nitrogen and sulfur atoms. The present invention also relates to methods for depositing zinc alloy protective coatings on aluminum and aluminum alloy substrates comprising immersing the aluminum or aluminum alloy substrate in the non-cyanide acidic immersion plating solutions of the invention. Optionally, the zinc alloy coated aluminum or aluminum alloy substrate is plated using an electroless or electrolytic metal plating solution.Type: GrantFiled: June 26, 2003Date of Patent: August 5, 2008Assignee: Atotech Deutschland GmbHInventors: Nayan H. Joshi, Maulik D. Mehta
-
Patent number: 7384901Abstract: A process for cleaning (e.g., desmutting) an aluminum surface, using compositions free of nitric acid and chromic acid and comprising, in one embodiment, an oxidant and at least one mineral acid salt. In another embodiment, the process uses a composition free of nitric acid and chromic acid and comprising an oxidant, at least one mineral acid salt, and a complexing agent which is a salt of an organic acid. Due at least in part to the absence of nitric and chromic acids, and in particular, strong mineral acids, the cleaning processes of the present invention remove smut residues from aluminum surfaces without significant etching of the aluminum.Type: GrantFiled: April 13, 2007Date of Patent: June 10, 2008Assignee: Atotech Deutschland GmbHInventors: Nayan H. Joshi, Maulik D. Mehta
-
Publication number: 20040242449Abstract: Compositions useful particularly for cleaning (desmutting) an aluminum surface is described. The compositions are free of nitric acid and chromic acid, and comprise, in one embodiment, an oxidant and at least one mineral acid salt. In another embodiment, the composition is free of nitric acid and chromic acid, and the composition comprises an oxidant, at least one mineral acid salt, and a complexing agent which is a salt of an organic acid. Aqueous compositions free of nitric acid and chromic acid also are described. Due at least in part to the absence of nitric and chromic acids, and in particular, strong mineral acids, the cleaning compositions of the present invention remove smut residues from aluminum surfaces without significant etching of the aluminum.Type: ApplicationFiled: June 2, 2003Publication date: December 2, 2004Inventors: Nayan H. Joshi, Maulik D. Mehta
-
Patent number: 6811819Abstract: The present invention relates to methods for depositing zincate coatings on aluminum and aluminum alloys comprising applying an immersion zincate coating on an aluminum or aluminum alloy substrates, optionally followed by plating the zincate coated aluminum or aluminum alloy substrate using an electroless or electrolytic metal plating solution. The present invention also relates to an improved aqueous alkaline zincate solution comprising hydroxide ions, zinc ions, nickel ions and/or cobalt iron ions, copper ions, and at least one inhibitor containing one or more nitrogen atoms, sulfur atoms, or both nitrogen and sulfur atoms provided said nitrogen atoms are not present in an aliphatic amine or hydroxylamine.Type: GrantFiled: March 23, 2004Date of Patent: November 2, 2004Assignee: Atotech Deutschland GmbHInventors: Nayan H. Joshi, Maulik D. Mehta
-
Patent number: 6790265Abstract: The present invention provides an improved aqueous alkaline zincate solution comprising hydroxide ions, zinc ions, nickel ions and/or cobalt iron ions, copper ions, and at least one inhibitor containing one or more nitrogen atoms, sulfur atoms, or both nitrogen and sulfur atoms provided said nitrogen atoms are not present in an aliphatic amine or hydroxylamine. The present invention also relates to methods for depositing zincate coatings on aluminum and aluminum alloys comprising applying an immersion zincate coating on an aluminum or aluminum alloy substrates, optionally followed by plating the zincate coated aluminum or aluminum alloy substrate using an electroless or electrolytic metal plating solution.Type: GrantFiled: October 7, 2002Date of Patent: September 14, 2004Assignee: Atotech Deutschland GmbHInventors: Nayan H. Joshi, Maulik D. Mehta
-
Publication number: 20040173467Abstract: The present invention relates to methods for depositing zincate coatings on aluminum and aluminum alloys comprising applying an immersion zincate coating on an aluminum or aluminum alloy substrates, optionally followed by plating the zincate coated aluminum or aluminum alloy substrate using an electroless or electrolytic metal plating solution. The present invention also relates to an improved aqueous alkaline zincate solution comprising hydroxide ions, zinc ions, nickel ions and/or cobalt iron ions, copper ions, and at least one inhibitor containing one or more nitrogen atoms, sulfur atoms, or both nitrogen and sulfur atoms provided said nitrogen atoms are not present in an aliphatic amine or hydroxylamine.Type: ApplicationFiled: March 23, 2004Publication date: September 9, 2004Inventors: Nayan H. Joshi, Maulik D. Mehta
-
Publication number: 20040067314Abstract: The present invention provides an improved aqueous alkaline zincate solution comprising hydroxide ions, zinc ions, nickel ions and/or cobalt iron ions, copper ions, and at least one inhibitor containing one or more nitrogen atoms, sulfur atoms, or both nitrogen and sulfur atoms provided said nitrogen atoms are not present in an aliphatic amine or hydroxylamine. The present invention also relates to methods for depositing zincate coatings on aluminum and aluminum alloys comprising applying an immersion zincate coating on an aluminum or aluminum alloy substrates, optionally followed by plating the zincate coated aluminum or aluminum alloy substrate using an electroless or electrolytic metal plating solution.Type: ApplicationFiled: October 7, 2002Publication date: April 8, 2004Inventors: Nayan H. Joshi, Maulik D. Mehta
-
Patent number: 6645557Abstract: A method of forming a conductive metal layer on a non-conductive surface, including providing a non-conductive surface; contacting the non-conductive surface with an aqueous solution or mixture containing a stannous salt to form a sensitized surface; contacting the sensitized surface with an aqueous solution or mixture containing a silver salt having a pH in the range from about 5 to about 10 to form a catalyzed surface; and electroless plating the catalyzed surface by applying an electroless plating solution to the catalyzed surface.Type: GrantFiled: October 17, 2001Date of Patent: November 11, 2003Assignee: Atotech Deutschland GmbHInventor: Nayan H. Joshi
-
Publication number: 20030113452Abstract: A method of forming a conductive metal layer on a non-conductive surface, including providing a non-conductive surface; contacting the non-conductive surface with an aqueous solution or mixture containing a stannous salt to form a sensitized surface; contacting the sensitized surface with an aqueous solution or mixture containing a silver salt having a pH in the range from about 5 to about 10 to form a catalyzed surface; and electroless plating the catalyzed surface by applying an electroless plating solution to the catalyzed surface.Type: ApplicationFiled: October 17, 2001Publication date: June 19, 2003Inventor: Nayan H. Joshi