Patents by Inventor Anirban Chakraborty
Anirban Chakraborty 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: 20230272502Abstract: A method for producing a zinc or zinc-alloy coated steel sheet with a tensile strength higher than 900 MPa, for the fabrication of resistance spot welds containing in average not more than two Liquid Metal Embrittlement cracks per weld having a depth of 100 ?m or more, with steps of providing a cold-rolled steel sheet, heating cold-rolled steel sheet up to a temperature T1 between 550° C. and Ac1+50° C. in a furnace zone with an atmosphere (A1) containing from 2 to 15% hydrogen by volume, so that the iron is not oxidized, then adding in the furnace atmosphere, water steam or oxygen with an injection flow rate Q higher than (0.07%/h×?), ? being equal to 1 if said element is water steam or equal to 0.52 if said element is oxygen, at a temperature T?T1, so to obtain an atmosphere (A2) with a dew point DP2 between ?15° C. and the temperature Te of the iron/iron oxide equilibrium dew point, then heating the sheet from temperature T1 up to a temperature T2 between 720° C. and 1000° C.Type: ApplicationFiled: May 10, 2023Publication date: August 31, 2023Inventors: Jean-Marc PIPARD, Sebastien CREMEL, Anirban CHAKRABORTY, Damon PANAHI, Olga GIRINA, Hassan GHASSEMI-ARMAKI, Pavan CHALLA VENKATA SURYA, Yacine BENLATRECHE
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Publication number: 20230257862Abstract: The present invention relates to a manufacturing method of a steel strip, a steel strip with controlled decarburized depth, a spot welded joint and the use of said steel strip or said spot welded joint. This invention is particularly well suited for the automotive industry due to the improvement of the Liquid Metal Embrittlement (LME) resistance along with target mechanical properties.Type: ApplicationFiled: April 22, 2021Publication date: August 17, 2023Inventors: Ranbir Singh JAMWAL, Hassan GHASSEMI-ARMAKI, Anirban CHAKRABORTY, Pavan CHALLA VENKATASURYA
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Publication number: 20230241865Abstract: The present invention relates to a method for the manufacture of a galvannealed steel sheet including the steps of A.) coating of the steel sheet with a first coating consisting of nickel and having a thickness between 150 nm and 650 nm, the steel sheet having the following composition in weight percentage 0.10<C<0.40%, 1.5<Mn<3.0%, 0.7<Si<3.0%, 0.05<Al<1.0%, 0.75<(Si+Al)<3.0%, and on a purely optional basis, one or more elements such as Nb?0.5%, B?0.010%, Cr s 1.0%, Mo?0.50%, Ni?1.0%, Ti?0.5%., the remainder of the composition is made up of iron and inevitable impurities resulting from the elaboration, B.) annealing of the coated steel sheet being annealed at a temperature between 600 to 1200° C., C.) coating of the steel sheet obtained in step B.) with a second coating based on zinc and D.) an alloying heat treatment to form a galvannealed steel sheet.Type: ApplicationFiled: April 6, 2023Publication date: August 3, 2023Inventors: Christian Allely, Pascal Bertho, Anirban Chakraborty, Hassan Ghassemi-Armaki
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Patent number: 11713502Abstract: A method for producing a high-strength steel sheet having high ductility, formability and weldability includes providing a cold-rolled sheet, with a composition containing: 0.15% ?C?0.23%, 1.4% ?Mn?2.6%, 0.6% ?Si?1.3%, with C+Si/10?0.30%, 0.4% ?Al?1.0%, with Al?6(C+Mn/10)?2.5%, 0.010% ?Nb?0.035%, 0.1% ?Mo?0.5%, annealing the sheet at 860° C.-900° C. to obtain a structure consisting of at least 90% austenite and at least 2% intercritical ferrite, quenching to a temperature between Ms-10° C. and Ms-60° C. at a rate Vc higher than 30° C./s, heating to a temperature PT between 410° C. and 470° C. for 60 s to 130 s, hot-dip coating the sheet, and cooling to room temperature. The microstructure includes 45% to 68% of martensite, consisting of 85% to 95% partitioned martensite having a C content of at most 0.45%, and fresh martensite; 10% to 15% retained austenite; 2% to 10% intercritical ferrite; 20% to 30% lower bainite.Type: GrantFiled: May 7, 2018Date of Patent: August 1, 2023Assignee: ARCELORMITTALInventors: Pavan C. Venkatasurya, Anirban Chakraborty, Hassan Ghassemi-Armaki
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Patent number: 11680331Abstract: A steel sheet coated with a coating comprising from 10 to 40% of nickel, the balance being zinc, such steel sheet having a microstructure comprising from 1 to 50% of residual austenite, from 1 to 60% of martensite and optionally at least one element chosen from: bainite, ferrite, cementite and pearlite, and the following chemical composition in weight: 0.10<C<0.50%, 1.0<Mn<5.0%, 0.7<Si<3.0%, 0.05<Al<1.0%, 0.75<(Si+Al)<3.0% and on a purely optional basis, one or more elements such as Nb?0.5%, B?0.005%, Cr?1.0%, Mo?0.50%, Ni?1.0%, Ti?0.5%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration.Type: GrantFiled: October 19, 2018Date of Patent: June 20, 2023Assignee: ArcelorMittalInventors: Anirban Chakraborty, Pascal Bertho, Hassan Ghassemi-Armaki, Christian Allely, Tiago Machado Amorim
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Publication number: 20230160033Abstract: A galvannealed steel sheet having a steel substrate coated with a first alloy layer with iron and nickel directly topped by a second alloy layer based on zinc, the first and second alloyed layers being alloyed through diffusion such that the second alloy layer includes from 5 to 15 wt.% of iron, from 0 to 15 wt.% of nickel, a balance being zinc.Type: ApplicationFiled: January 9, 2023Publication date: May 25, 2023Inventors: Anirban CHAKRABORTY, Hassan GHASSEMI-ARMAKI
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Patent number: 11654653Abstract: The present invention relates to a method for the manufacture of a galvannealed steel sheet including the steps of A.) coating of the steel sheet with a first coating consisting of nickel and having a thickness between 150 nm and 650 nm, the steel sheet having the following composition in weight percentage 0.10<C<0.40%, 1.5<Mn<3.0%, 0.7<Si<3.0%, 0.05<Al<1.0%, 0.75<(Si+Al)<3.0%, and on a purely optional basis, one or more elements such as Nb?0.5%, B?0.010%, Cr?1.0%, Mo?0.50%, Ni?1.0%, Ti?0.5%, the remainder of the composition is made up of iron and inevitable impurities resulting from the elaboration, B.) annealing of the coated steel sheet being annealed at a temperature between 600 to 1200° C., C.) coating of the steel sheet obtained in step B.) with a second coating based on zinc and D.) an alloying heat treatment to form a galvannealed steel sheet.Type: GrantFiled: April 25, 2018Date of Patent: May 23, 2023Assignee: ArcelorMittalInventors: Christian Allely, Pascal Bertho, Anirban Chakraborty, Hassan Ghassemi-Armaki
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Patent number: 11649522Abstract: A method for producing a zinc or zinc-alloy coated steel sheet with a tensile strength higher than 900 MPa, for the fabrication of resistance spot welds containing in average not more than two Liquid Metal Embrittlement cracks per weld having a depth of 100 ?m or more, with steps of providing a cold-rolled steel sheet, heating cold-rolled steel sheet up to a temperature T1 between 550° C. and Ac1+50° C. in a furnace zone with an atmosphere (A1) containing from 2 to 15% hydrogen by volume, so that the iron is not oxidized, then adding in the furnace atmosphere, water steam or oxygen with an injection flow rate Q higher than (0.07%/h×?), ? being equal to 1 if said element is water steam or equal to 0.52 if said element is oxygen, at a temperature T?T1, so to obtain an atmosphere (A2) with a dew point DP2 between ?15° C. and the temperature Te of the iron/iron oxide equilibrium dew point, then heating the sheet from temperature T1 up to a temperature T2 between 720° C. and 1000° C.Type: GrantFiled: June 13, 2018Date of Patent: May 16, 2023Assignee: ArcelorMittalInventors: Jean-Marc Pipard, Sebastien Cremel, Anirban Chakraborty, Damon Panahi, Olga Girina, Hassan Ghassemi-Armaki, Pavan Challa Venkata Surya, Yacine Benlatreche
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Publication number: 20230137133Abstract: The present invention relates to a method for the manufacture of a coated steel sheet comprising the following successive steps: A. the coating of the steel sheet with a first coating consisting of nickel and having a thickness between 600 nm and 1400 nm, the steel sheet having the following composition in weight: 0.10<C<0.40%, 1.5<Mn<3.0%, 0.7<Si<3.0%, 0.05<Al<1.0%, 0.75<(Si+Al)<3.0%, and on a purely optional basis, one or more elements such as Nb?0.5%, B?0.010%, Cr?1.0%, Mo?0.50%, Ni?1.0%, Ti?0.5%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration, B. the recrystallization annealing at a temperature between 820 to 1200° C., C. the coating with a second coating based on zinc not comprising nickel.Type: ApplicationFiled: December 30, 2022Publication date: May 4, 2023Inventors: Anirban CHAKRABORTY, Hassan GHASSEMI-ARMAKI, Pascal BERTHO, Christian ALLELY
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Patent number: 11578378Abstract: Method for the manufacture of a galvannealed steel sheet includes the following steps: A) the provision of a pre-coated steel sheet coated with a first coating comprising iron and nickel, such steel sheet having the following chemical composition in weight percent 0.10<C<0.40%, 1.5<Mn<3.0%, 0.7<Si<2.0%, 0.05<Al<1.0%, 0.75<(Si+Al)<3.0% and on a purely optional basis, one or more elements such as Nb?0.5%, B?0.005%, Cr?1.0%, Mo?0.50%, Ni?1.0%, Ti?0.5%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration, B) the thermal treatment of such pre-coated steel sheet at a temperature between 600 to 1000° C., C) the hot-dip coating of the steel sheet obtained in step B) with a second coating based on zinc and D) an alloying treatment to form a galvannealed steel sheet.Type: GrantFiled: October 19, 2018Date of Patent: February 14, 2023Assignee: ArcelorMittalInventors: Anirban Chakraborty, Hassan Ghassemi-Armaki
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Patent number: 11566310Abstract: The present invention relates to a method for the manufacture of a coated steel sheet comprising the following successive steps: A. the coating of the steel sheet with a first coating consisting of nickel and having a thickness between 600 nm and 1400 nm, the steel sheet having the following composition in weight: 0.10<C<0.40%, 1.5<Mn<3.0%, 0.7<Si<3.0%, 0.05<Al<1.0%, 0.75<(Si+Al)<3.0%, and on a purely optional basis, one or more elements such as Nb?0.5%, B?0.010%, Cr?1.0%, Mo?0.50%, Ni?1.0%, Ti?0.5%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration, B. the recrystallization annealing at a temperature between 820 to 1200° C., C. the coating with a second coating based on zinc not comprising nickel.Type: GrantFiled: November 15, 2018Date of Patent: January 31, 2023Assignee: ArcelorMittalInventors: Anirban Chakraborty, Hassan Ghassemi-Armaki, Pascal Bertho, Christian Allely
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Publication number: 20220412913Abstract: A sensor having a distal end and an intermediate region adjacent to the distal end is provided. The sensor includes an insulator base substrate, sensor electrodes over the insulator base substrate, an electrode lead pattern over the insulator base substrate, wherein the electrode lead pattern includes electrode leads configured for contact with the sensor electrodes, and wherein the electrode leads extend completely across the intermediate region in a longitudinal direction, and a structural backing layer over the electrode lead pattern and insulator base substrate; wherein a side edge of the structural backing layer over the electrode lead pattern extends completely across the structural backing layer in the longitudinal direction.Type: ApplicationFiled: August 29, 2022Publication date: December 29, 2022Inventors: Christina Pai, Brian P. McGee, Mohsen Askarinya, Mary Ellen B. Coe, Cynthia J. Jones, Hsiu-Hsin Chung, Nathan Hobbs, Jorge L. Nieto, Anirban Chakraborty
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Publication number: 20220324477Abstract: A method and activity recognition system for recognising activities in surrounding environment for controlling navigation of an autonomous vehicle is disclosed. The activity recognition system receives first data feed from neuromorphic event-based camera and second data feed from frame-based RGB video camera. The first data feed comprises high-speed temporal information encoding motion associated with change in surrounding environment at each spatial location, and second data feed comprises spatio-temporal data providing scene-level contextual information associated with surrounding environment. An adaptive sampling of second data feed is performed with respect to foreground activity rate based on amount of foreground motion encoded in first data feed. Further, the activity recognition system recognizes activities associated with at least one object in surrounding environment by identifying correlation between both data feed by using two-stream neural network model.Type: ApplicationFiled: July 16, 2021Publication date: October 13, 2022Inventors: Chetan Singh Thakur, Anirban Chakraborty, Sathyaprakash Narayanan, Bibrat Ranjan Pradhan
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Patent number: 11466354Abstract: Method for the manufacture of a coated steel sheet including the following step of A) the provision of a pre-coated steel sheet coating with a first coating including iron and nickel, B) the thermal treatment of such pre-coated steel sheet at a temperature between 600 and 1000° C., and C) the coating of the steel sheet obtained in step B) with a second coating based on zinc.Type: GrantFiled: October 19, 2018Date of Patent: October 11, 2022Assignee: ArcelorMittalInventors: Anirban Chakraborty, Hassan Ghassemi-Armaki
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Patent number: 11448611Abstract: Sensors and methods for manufacturing sensors are provided. An exemplary method for manufacturing a sensor includes forming an electrode lead pattern over an insulator base substrate. Further, the method includes forming a structural backing layer over the electrode lead pattern and insulator base substrate. Also, the method includes performing a cutting process to cut through the structural backing layer to form a structural backing over the electrode lead pattern.Type: GrantFiled: July 3, 2019Date of Patent: September 20, 2022Assignee: Medtronic MiniMed, Inc.Inventors: Christina Pai, Brian P. McGee, Mohsen Askarinya, Mary Ellen B. Coe, Cynthia J. Jones, Hsiu-Hsin Chung, Nathan Hobbs, Jorge L. Nieto, Anirban Chakraborty
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Publication number: 20220017985Abstract: A cold rolled and heat-treated steel sheet having a composition including, by weight percent: C 0.3-0.4%, Mn 2.0-2.6%, Si: 0.8-1.6%, Al 0.01-0.6%, Mo 0.15-0.5%, Cr 0.3-1.0%, Nb?0.06%, Ti?0.06%, Ni?0.8%, S?0.010%, P?0.020% and N?0.008%, the remainder of the composition being iron and unavoidable impurities resulting from the smelting, and having a microstructure consisting of, in surface fraction: between 15% and 30% of retained austenite, said retained austenite having a carbon content of at least 0.7%, between 70% and 85% of tempered martensite, at most 5% of fresh martensite and at most 5% of bainite. It also deals with a manufacturing method thereof.Type: ApplicationFiled: December 17, 2019Publication date: January 20, 2022Inventors: Patrice ALEXANDRE, Magali BOUZAT, Anirban CHAKRABORTY, Hassan GHASSEMI-ARMAKI, Olga GIRINA, Ronan JACOLOT, Alexey KOLTSOV, Aude NADLER, Damon PANAHI, Michel SOLER
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Publication number: 20210003526Abstract: Sensors and methods for manufacturing sensors are provided. An exemplary method for manufacturing a sensor includes forming an electrode lead pattern over an insulator base substrate. Further, the method includes forming a structural backing layer over the electrode lead pattern and insulator base substrate. Also, the method includes performing a cutting process to cut through the structural backing layer to form a structural backing over the electrode lead pattern.Type: ApplicationFiled: July 3, 2019Publication date: January 7, 2021Inventors: Christina Pai, Brian P. McGee, Mohsen Askarinya, Mary Ellen B. Coe, Cynthia J. Jones, Hsiu-Hsin Chung, Nathan Hobbs, Jorge L. Nieto, Anirban Chakraborty
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Publication number: 20200399774Abstract: A steel sheet coated with a coating comprising from 10 to 40% of nickel, the balance being zinc, such steel sheet having a microstructure comprising from 1 to 50% of residual austenite, from 1 to 60% of martensite and optionally at least one element chosen from: bainite, ferrite, cementite and pearlite, and the following chemical composition in weight: 0.10<C<0.50%, 1.0<Mn<5.0%, 0.7<Si<3.0%, 0.05<Al<1.0%, 0.75<(Si+Al)<3.0% and on a purely optional basis, one or more elements such as Nb?0.5%, B?0.005%, Cr?1.0%, Mo?0.50%, Ni?1.0%, Ti?0.5%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration.Type: ApplicationFiled: October 19, 2018Publication date: December 24, 2020Inventors: Anirban CHAKRABORTY, Pascal BERTHO, Hassan GHASSEMI-ARMAKI, Christian ALLELY, Tiago MACHADO AMORIM
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Publication number: 20200340124Abstract: Method for the manufacture of a coated steel sheet including the following successive steps A. the provision of an annealed steel sheet having the following chemical composition in weight: 0.10<C<0.40%, 1.5<Mn<3.0%, 0.7<Si<2.0%, 0.05<Al<1.0%, 0.75<(Si+Al)<3.0%, and on a purely optional basis, one or more elements such as Nb?0.5%, B?0.005%, Cr?1.0%, Mo?0.50%, Ni?1.0%, Ti?0.5%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration, such steel sheet being annealed at a temperature between 600 to 1200° C., B. the coating of the steel sheet obtained in step A) with a first coating including nickel, such first coating not including iron, and having a thickness equal or above 0.5 ?m and C. the coating of the steel sheet obtained in step B) with a second coating based on zinc. A steel sheet, a spot welded joint and further uses of the steel sheet are also provided.Type: ApplicationFiled: October 19, 2018Publication date: October 29, 2020Inventors: Pascal BERTHO, Anirban CHAKRABORTY, Hassan GHASSEMI-ARMAKI, Christian ALLELY, Tiago MACHADO AMORIM, Daniel CHALEIX
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Publication number: 20200283868Abstract: Method for the manufacture of a galvannealed steel sheet includes the following steps: A) the provision of a pre-coated steel sheet coated with a first coating comprising iron and nickel, such steel sheet having the following chemical composition in weight percent 0.10<C<0.40%, 1.5<Mn<3.0%, 0.7<Si<2.0%, 0.05<Al<1.0%, 0.75<(Si+Al)<3.0% and on a purely optional basis, one or more elements such as Nb?0.5%, B?0.005%, Cr?1.0%, Mo?0.50%, Ni?1.0%, Ti?0.5%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration, B) the thermal treatment of such pre-coated steel sheet at a temperature between 600 to 1000° C., C) the hot-dip coating of the steel sheet obtained in step B) with a second coating based on zinc and D) an alloying treatment to form a galvannealed steel sheet.Type: ApplicationFiled: October 19, 2018Publication date: September 10, 2020Inventors: Anirban CHAKRABORTY, Hassan GHASSEMI-ARMAKI