Patents by Inventor Govindan Sundararajan
Govindan Sundararajan 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: 20230357944Abstract: An electrolyte solution for iron-tungsten plating is prepared by dissolving in an aqueous medium a divalent iron salt (e.g., iron (II) sulfate) and an alkali metal citrate (e.g., sodium citrate, potassium citrate, or other alkali metal citrate) to form a first solution, dissolving in the first solution a tungstate salt (e.g., sodium tungstate, potassium tungstate, or other potassium tungstate) to form a second solution, and dissolving in the second solution a citric acid to form the electrolyte solution. An iron-tungsten coating is formed on a substrate using the electrolyte solution by passing a current between a cathode and an anode through the electrolyte solution to deposit iron and tungsten on the substrate.Type: ApplicationFiled: June 29, 2023Publication date: November 9, 2023Inventors: Vijaykumar S. Ijeri, Om Prakash, Stephen P. Gaydos, Nitin Pandurang Wasekar, Govindan Sundararajan, Dameracharla Srinivasa Rao
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Patent number: 11773502Abstract: An electrolyte solution for iron-tungsten plating is prepared by dissolving in an aqueous medium a divalent iron salt (e.g., iron (II) sulfate) and an alkali metal citrate (e.g., sodium citrate, potassium citrate, or other alkali metal citrate) to form a first solution, dissolving in the first solution a tungstate salt (e.g., sodium tungstate, potassium tungstate, or other potassium tungstate) to form a second solution, and dissolving in the second solution a citric acid to form the electrolyte solution. An iron-tungsten coating is formed on a substrate using the electrolyte solution by passing a current between a cathode and an anode through the electrolyte solution to deposit iron and tungsten on the substrate.Type: GrantFiled: September 16, 2021Date of Patent: October 3, 2023Assignee: The Boeing CompanyInventors: Vijaykumar S. Ijeri, Om Prakash, Stephen P. Gaydos, Nitin Pandurang Wasekar, Govindan Sundararajan, Dameracharla Srinivasa Rao
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Patent number: 11732375Abstract: An electrolyte solution for iron-tungsten plating is prepared by dissolving in an aqueous medium a divalent iron salt (e.g., iron (II) sulfate) and an alkali metal citrate (e.g., sodium citrate, potassium citrate, or other alkali metal citrate) to form a first solution, dissolving in the first solution a tungstate salt (e.g., sodium tungstate, potassium tungstate, or other potassium tungstate) to form a second solution, and dissolving in the second solution a citric acid to form the electrolyte solution. An iron-tungsten coating is formed on a substrate using the electrolyte solution by passing a current between a cathode and an anode through the electrolyte solution to deposit iron and tungsten on the substrate.Type: GrantFiled: November 12, 2021Date of Patent: August 22, 2023Assignee: The Boeing CompanyInventors: Vijaykumar S. Ijeri, Om Prakash, Stephen P. Gaydos, Nitin Pandurang Wasekar, Govindan Sundararajan, Dameracharla Srinivasa Rao
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Publication number: 20220074066Abstract: An electrolyte solution for iron-tungsten plating is prepared by dissolving in an aqueous medium a divalent iron salt (e.g., iron (II) sulfate) and an alkali metal citrate (e.g., sodium citrate, potassium citrate, or other alkali metal citrate) to form a first solution, dissolving in the first solution a tungstate salt (e.g., sodium tungstate, potassium tungstate, or other potassium tungstate) to form a second solution, and dissolving in the second solution a citric acid to form the electrolyte solution. An iron-tungsten coating is formed on a substrate using the electrolyte solution by passing a current between a cathode and an anode through the electrolyte solution to deposit iron and tungsten on the substrate.Type: ApplicationFiled: November 12, 2021Publication date: March 10, 2022Inventors: Vijaykumar S. Ijeri, Om Prakash, Stephen P. Gaydos, Nitin Pandurang Wasekar, Govindan Sundararajan, Dameracharla Srinivasa Rao
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Publication number: 20220002893Abstract: An electrolyte solution for iron-tungsten plating is prepared by dissolving in an aqueous medium a divalent iron salt (e.g., iron (II) sulfate) and an alkali metal citrate (e.g., sodium citrate, potassium citrate, or other alkali metal citrate) to form a first solution, dissolving in the first solution a tungstate salt (e.g., sodium tungstate, potassium tungstate, or other potassium tungstate) to form a second solution, and dissolving in the second solution a citric acid to form the electrolyte solution. An iron-tungsten coating is formed on a substrate using the electrolyte solution by passing a current between a cathode and an anode through the electrolyte solution to deposit iron and tungsten on the substrate.Type: ApplicationFiled: September 16, 2021Publication date: January 6, 2022Inventors: Vijaykumar S. IJERI, Om PRAKASH, Stephen P. GAYDOS, Nitin Pandurang WASEKAR, Govindan SUNDARARAJAN, Dameracharla Srinivasa RAO
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Patent number: 11208731Abstract: An electrolyte solution for iron-tungsten plating is prepared by dissolving in an aqueous medium a divalent iron salt (e.g., iron (II) sulfate) and an alkali metal citrate (e.g., sodium citrate, potassium citrate, or other alkali metal citrate) to form a first solution, dissolving in the first solution a tungstate salt (e.g., sodium tungstate, potassium tungstate, or other potassium tungstate) to form a second solution, and dissolving in the second solution a citric acid to form the electrolyte solution. An iron-tungsten coating is formed on a substrate using the electrolyte solution by passing a current between a cathode and an anode through the electrolyte solution to deposit iron and tungsten on the substrate.Type: GrantFiled: June 9, 2017Date of Patent: December 28, 2021Assignee: The Boeing CompanyInventors: Vijaykumar S. Ijeri, Om Prakash, Stephen P. Gaydos, Nitin Pandurang Wasekar, Govindan Sundararajan, Dameracharla Srinivasa Rao
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Publication number: 20180355498Abstract: An electrolyte solution for iron-tungsten plating is prepared by dissolving in an aqueous medium a divalent iron salt (e.g., iron (II) sulfate) and an alkali metal citrate (e.g., sodium citrate, potassium citrate, or other alkali metal citrate) to form a first solution, dissolving in the first solution a tungstate salt (e.g., sodium tungstate, potassium tungstate, or other potassium tungstate) to form a second solution, and dissolving in the second solution a citric acid to form the electrolyte solution. An iron-tungsten coating is formed on a substrate using the electrolyte solution by passing a current between a cathode and an anode through the electrolyte solution to deposit iron and tungsten on the substrate.Type: ApplicationFiled: June 9, 2017Publication date: December 13, 2018Inventors: Vijaykumar S. Ijeri, Om Prakash, Stephen P. Gaydos, Nitin Pandurang Wasekar, Govindan Sundararajan, Dameracharla Srinivasa Rao
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Patent number: 9365945Abstract: A process for forming coatings on metallic web, the process including: immersing at least three metallic webs in an electrolytic solution contained in a reaction chamber; passing wave multiphase alternating current across said metallic webs by using back-to-back thyristors connected in parallel; moving the metallic webs through the electrolytic solution; and removing the coated webs from the reaction chamber.Type: GrantFiled: August 17, 2012Date of Patent: June 14, 2016Assignee: International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI)Inventors: Lingamaneni Rama Krishna, Nitin Pandurang Wasekar, Govindan Sundararajan
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Patent number: 8486237Abstract: An apparatus for continuously forming thin ceramic coatings on metal sheets, foils or wires. The apparatus has a reaction chamber, perforated nylon sheets, nylon bar guides, copper rods attached to a power supply, nylon collecting rods, and an inlet and an outlet. The reaction chamber is capable of containing an electrolytic solution. The copper rods are separately connected to the R, Y, or B phase of the power supply. Each phase is provided with two thyristors and the output of the thyristors is connected to the copper rods using current transformers. A process for continuously forming thin ceramic coatings on metal sheets, foils or wires is also provided.Type: GrantFiled: October 14, 2009Date of Patent: July 16, 2013Assignee: International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI)Inventors: Lingamaneni Rama Krishna, Nitin Pandurang Wasekar, Govindan Sundararajan
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Publication number: 20120305402Abstract: A process for forming coatings on metallic web, the process including: immersing at least three metallic webs in an electrolytic solution contained in a reaction chamber; passing wave multiphase alternating current across said metallic webs by using back-to-back thyristors connected in parallel; moving the metallic webs through the electrolytic solution; and removing the coated webs from the reaction chamber.Type: ApplicationFiled: August 17, 2012Publication date: December 6, 2012Applicant: International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI)Inventors: Lingamaneni Rama Krishna, Nitin Pandurang Wasekar, Govindan Sundararajan
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Publication number: 20100163421Abstract: An apparatus for continuously forming thin ceramic coatings on metal sheets, foils or wires. The apparatus having a reaction chamber, perforated nylon sheets, nylon bar guides, copper rods attached to a power supply, nylon collecting rods, and an inlet and an outlet. The reaction chamber is capable of containing an electrolytic solution. The copper rods are separately connected to the R, Y, or B phase of the power supply. Each phase is provided with two thyristors and the output of the thyristors is connected to the copper rods using current transformers. A process for continuously forming thin ceramic coatings on metal sheets, foils or wires is also provided.Type: ApplicationFiled: October 14, 2009Publication date: July 1, 2010Applicant: International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI)Inventors: Lingamaneni Rama Krishna, Nitin Pandurang Wasekar, Govindan Sundararajan
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Patent number: 6893551Abstract: A process for forming oxide based dense ceramic composite coatings on reactive metal and allow bodies involves suspension of at least two reactive metal or alloy bodies in a non-metallic, non-conducting, non-reactive chamber in such a way that it causes either partial or full immersion of the bodies in a continuously circulating electrolyte. Thyristor controlled, modified shaped wave multiphase alternating current power supply is applied across the bodies where in each body is connected to an electrode. Electric current supplied to the bodies is slowly increased to a particular value till the required current density is achieved and the maintained at the same level throughout the process. Visible arcing at the surface of the immersed regions of the bodies is identified when the applied electric potential crosses 60V. Electric potential is further increased gradually to compensate the increasing resistance of the coating.Type: GrantFiled: August 2, 2002Date of Patent: May 17, 2005Assignee: International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI)Inventors: Lingamaneni Rama Krishna, Alexander Vasilyevich Rybalko, Govindan Sundararajan
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Publication number: 20030094377Abstract: This invention disclosed in this application relates to a process for forming oxide based dense ceramic composite coatings on reactive metal and alloy bodies. The process involves suspension of at least two reactive metal or alloy bodies in a non-metallic, non-conducting, non-reactive chamber in such a way that it causes either partial or full immersion of the said bodies in a continuously circulating electrolyte. Thyristor controlled, modified shaped wave multiphase alternating current power supply is applied across the said bodies where in each body is connected to an electrode. Electric current supplied to the said bodies where in each body is connected to an electrode. Electric current supplied to the said bodies is slowly increased to a particular value till the required current density is achieved and the maintained at the same level throughout the process. Visible arcing at the surface of the immersed regions of the said bodies is identified when the applied electric potential crosses 60V.Type: ApplicationFiled: August 2, 2002Publication date: May 22, 2003Inventors: Lingamaneni Rama Krishna, Alexander Vasilyevich Rybalko, Govindan Sundararajan