Patents by Inventor Ajaykumar Bunha
Ajaykumar Bunha 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: 11935708Abstract: The present invention if related to an improved electrolytic capacitor and a method of making the improved electrolytic capacitor. The electrolytic capacitor comprises an anode comprising a dielectric layer on the anode. A first mordant layer is on the dielectric wherein the first mordant layer comprises a mordant compound of Formula A: wherein: R1 and R2 is independently selected from H; cation, linear alkyl, cyclic alkyl or substituted alkyl of 1 to 10 carbons; R3 is selected from —CR4R5R6 wherein R4 represents a hydrogen, an alkyl of 1-20 carbons or an aryl of 6-20 carbons; R4 and R5 can be taken together to represent a cyclic alkyl or substituted cyclic alkyl or (—CR6OP(O)OR1OR2)n; R5 represents an alkyl of 1-20 carbons or an aryl of 6-20 carbons; R4 and R5 can be taken together to represent a cyclic alkyl or substituted cyclic alkyl or (—CR6OP(O)OR1OR2)n; R6 represents a hydrogen, an alkyl of 1-20 carbons or an aryl of 6-20 carbons; and n is an integer from 1 to 20; and a crosslinker.Type: GrantFiled: June 2, 2022Date of Patent: March 19, 2024Assignee: KEMET Electronics CorporationInventors: Ajaykumar Bunha, Antony P. Chacko
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Patent number: 11694851Abstract: An improved electrolytic capacitor, and method of making the electrolytic capacitor, is provided. The electrolytic capacitor comprises an anode comprising a dielectric layer on the anode. A primary conductive polymer layer is on dielectric and a mordant layer on the primary conductive layer wherein the mordant layer comprises a mordant compound of Formula A; wherein: each of R1-R6 is independently selected from H and —PO(OR7)2 wherein each R7 is independently selected from H, substituted or unsubstituted alkyl of 1-20 carbons, substituted or unsubstituted aryl of 6-20 carbons or an alkylaryl of 7-21 carbons; with the proviso that at least one of R1-R6 is —PO(OH)2. A secondary conductive polymer layer is on the mordant layer.Type: GrantFiled: February 18, 2021Date of Patent: July 4, 2023Assignee: KEMET Electronics CorporationInventors: Antony P. Chacko, John Joseph Ols, Ajaykumar Bunha, Yaru Shi
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Patent number: 11676770Abstract: Provided is an improved capacitor formed by a process comprising: providing an anode comprising a dielectric thereon wherein the anode comprises a sintered powder wherein the powder has a powder charge of at least 45,000 ?FV/g; and forming a first conductive polymer layer encasing at least a portion of the dielectric by applying a first slurry wherein the first slurry comprises a polyanion and a conductive polymer and wherein the polyanion and conductive polymer are in a weight ratio of greater than 3 wherein the conductive polymer and polyanion forms conductive particles with an average particle size of no more than 20 nm.Type: GrantFiled: June 24, 2021Date of Patent: June 13, 2023Assignee: KEMET Electronics CorporationInventors: Yaru Shi, Antony P. Chacko, Ajaykumar Bunha, Qingping Chen, Elisabeth Crittendon Key
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Patent number: 11482382Abstract: The invention is related to an improved capacitor and an improved process for forming a capacitor. The process comprises forming an anode comprising a dielectric on the anode. A cathode layer is then formed on the dielectric wherein the cathode layer comprises a self-doped conductive polymer and a cross-linker wherein a weight ratio of crosslinker to self-doped conductive polymer is at least 0.01 to no more than 2.Type: GrantFiled: August 13, 2020Date of Patent: October 25, 2022Assignee: KEMET Electronics CorporationInventors: Yaru Shi, Antony P. Chacko, Chenyi Gu, Ajaykumar Bunha, Qingping Chen
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Publication number: 20220293349Abstract: The present invention if related to an improved electrolytic capacitor and a method of making the improved electrolytic capacitor. The electrolytic capacitor comprises an anode comprising a dielectric layer on the anode. A first mordant layer is on the dielectric wherein the first mordant layer comprises a mordant compound of Formula A: wherein: R1 and R2 is independently selected from H; cation, linear alkyl, cyclic alkyl or substituted alkyl of 1 to 10 carbons; R3 is selected from —CR4R5R6 wherein R4 represents a hydrogen, an alkyl of 1-20 carbons or an aryl of 6-20 carbons; R4 and R5 can be taken together to represent a cyclic alkyl or substituted cyclic alkyl or (—CR6OP(O)OR1OR2)n; R5 represents an alkyl of 1-20 carbons or an aryl of 6-20 carbons; R4 and R5 can be taken together to represent a cyclic alkyl or substituted cyclic alkyl or (—CR6OP(O)OR1OR2)n; R6 represents a hydrogen, an alkyl of 1-20 carbons or an aryl of 6-20 carbons; and n is an integer from 1 to 20; and a crosslinker.Type: ApplicationFiled: June 2, 2022Publication date: September 15, 2022Inventors: Ajaykumar Bunha, Antony P. Chacko
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Publication number: 20220262569Abstract: An improved electrolytic capacitor, and method of making the electrolytic capacitor, is provided. The electrolytic capacitor comprises an anode comprising a dielectric layer on the anode. A primary conductive polymer layer is on dielectric and a mordant layer on the primary conductive layer wherein the mordant layer comprises a mordant compound of Formula A; wherein: each of R1-R6 is independently selected from H and —PO(OR7)2 wherein each R7 is independently selected from H, substituted or unsubstituted alkyl of 1-20 carbons, substituted or unsubstituted aryl of 6-20 carbons or an alkylaryl of 7-21 carbons; with the proviso that at least one of R1-R6 is —PO(OH)2. A secondary conductive polymer layer is on the mordant layer.Type: ApplicationFiled: February 18, 2021Publication date: August 18, 2022Inventors: Antony P. Chacko, John Joseph Ols, Ajaykumar Bunha, Yaru Shi
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Patent number: 11396594Abstract: An improved formulation of conductive polymer is provided. The formulation comprises a conductive polymer and a polyanion wherein the polyanion is a copolymer comprising groups A, B and C represented the ratio of Formula A: AxByCz??Formula A wherein: A is polystyrenesulfonic acid or salt of polystyrenesulfonate; B and C separately represent polymerized units substituted by a group selected from: —C(O)OR6 wherein R6 is selected from the group consisting of: —(CHR17)b—R18. All other groups are defined. The conductive polymer has an average particle size of at least 1 nm to no more than 10 microns.Type: GrantFiled: February 4, 2021Date of Patent: July 26, 2022Assignee: KEMET Electronics CorporationInventors: Ajaykumar Bunha, Antony P. Chacko, Yaru Shi, Qingping Chen, Philip M. Lessner
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Publication number: 20220223351Abstract: Provided herein is a method for forming a capacitor and an improved capacitor formed by the method. The method comprises providing an anode with an anode lead extending therefrom. A dielectric is formed on the anode thereby forming an anodized anode. A cathode layer is formed over the dielectric wherein the cathode layer is formed by applying a conductive polymer solution or dispersion and applying a primer solution or dispersion comprising a monophosphonium or monosulfonium cation.Type: ApplicationFiled: March 30, 2022Publication date: July 14, 2022Inventors: Yaru Shi, Antony P. Chacko, Ajaykumar Bunha
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Publication number: 20220148816Abstract: Provided is an improved capacitor formed by a process comprising: providing an anode comprising a dielectric thereon wherein the anode comprises a sintered powder wherein the powder has a powder charge of at least 45,000 ?FV/g; and forming a first conductive polymer layer encasing at least a portion of the dielectric by applying a first slurry wherein the first slurry comprises a polyanion and a conductive polymer and wherein the polyanion and conductive polymer are in a weight ratio of greater than 3 wherein the conductive polymer and polyanion forms conductive particles with an average particle size of no more than 20 nm.Type: ApplicationFiled: June 24, 2021Publication date: May 12, 2022Inventors: Yaru Shi, Antony P. Chacko, Ajaykumar Bunha, Qingping Chen, Elisabeth Crittendon Key
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Patent number: 11177076Abstract: A capacitor comprising an anode foil; and a conductive polymer layer on the anode foil. The conductive polymer layer comprises first particles comprising conductive polymer and polyanion and second particles comprising the conductive polymer and the polyanion wherein the first particles have an average particle diameter of at least 1 micron to no more than 10 microns. The second particles have an average particle diameter of at least 1 nm to no more than 600 nm.Type: GrantFiled: September 17, 2020Date of Patent: November 16, 2021Assignee: KEMET Electronics CorporationInventors: Ajaykumar Bunha, Antony P. Chacko, Qingping Chen, Yaru Shi, Philip M. Lessner
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Patent number: 11101077Abstract: A dispersion comprising first particles comprising conductive polymer and polyanion and second particles comprising the conductive polymer and said polyanion wherein the first particles have an average particle diameter of at least 1 micron to no more than 10 microns and the second particles have an average particle diameter of at least 1 nm to no more than 600 nm.Type: GrantFiled: July 28, 2020Date of Patent: August 24, 2021Assignee: KEMET Electronics CorporationInventors: Ajaykumar Bunha, Antony P. Chacko, Yaru Shi, Qingping Chen, Philip M. Lessner
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Patent number: 11081290Abstract: Provided is an improved capacitor formed by a process comprising: providing an anode comprising a dielectric thereon wherein the anode comprises a sintered powder wherein the powder has a powder charge of at least 45,000 ?FV/g; and forming a first conductive polymer layer encasing at least a portion of the dielectric by applying a first slurry wherein the first slurry comprises a polyanion and a conductive polymer and wherein the polyanion and conductive polymer are in a weight ratio of greater than 3 wherein the conductive polymer and polyanion forms conductive particles with an average particle size of no more than 20 nm.Type: GrantFiled: January 13, 2020Date of Patent: August 3, 2021Assignee: KEMET Electronics CorporationInventors: Yaru Shi, Antony P. Chacko, Ajaykumar Bunha, Qingping Chen, Elisabeth Crittendon Key
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Publication number: 20210198469Abstract: An improved slurry of conductive polymer is provided. The slurry comprises a conductive polymer and a polyanion wherein the polyanion is a copolymer comprising groups A, B and C represented the ratio of Formula A: AxByCz?? Formula A wherein: A is polystyrenesulfonic acid or salt of polystyrenesulfonate; B and C separately represent polymerized units substituted by a group selected from: —C(O)OR6 wherein R6 is selected from the group consisting of: —(CHR17)b—R18. All other groups are defined. The conductive polymer has an average particle size of at least 1 nm to no more than 10 microns.Type: ApplicationFiled: February 4, 2021Publication date: July 1, 2021Inventors: Ajaykumar Bunha, Antony P. Chacko, Yaru Shi, Qingping Chen, Philip M. Lessner
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Patent number: 10947376Abstract: A capacitor and a method of making a capacitor, is provided with improved reliability performance. The capacitor comprises an anode; a dielectric on the anode; and a cathode on the dielectric wherein the cathode comprises a conductive polymer and a polyanion wherein the polyanion is a copolymer comprising groups A, B and C represented by Formula AxByCz as described herein.Type: GrantFiled: May 14, 2019Date of Patent: March 16, 2021Assignee: KEMET Electronics CorporationInventors: Ajaykumar Bunha, Antony P. Chacko, Yaru Shi, Qingping Chen, Philip M. Lessner
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Patent number: 10943742Abstract: A capacitor, and process for forming a capacitor, is described wherein the capacitor comprises a conductive polymer layer. The conductive polymer comprises first particles comprising conductive polymer and polyanion and second particles comprising the conductive polymer and said polyanion wherein the first particles have an average particle diameter of at least 1 micron to no more than 10 microns and the second particles have an average particle diameter of at least 1 nm to no more than 600 nm.Type: GrantFiled: June 10, 2019Date of Patent: March 9, 2021Assignee: KEMET Electronics CorporationInventors: Ajaykumar Bunha, Antony P. Chacko, Yaru Shi, Qingping Chen, Philip M. Lessner
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Publication number: 20210005396Abstract: An improved capacitor is provided wherein the capacitor comprising an anode foil; and a conductive polymer layer on the anode foil. The conductive polymer layer comprises first particles comprising conductive polymer and polyanion and second particles comprising the conductive polymer and the polyanion wherein the first particles have an average particle diameter of at least 1 micron to no more than 10 microns. The second particles have an average particle diameter of at least 1 nm to no more than 600 nm.Type: ApplicationFiled: September 17, 2020Publication date: January 7, 2021Inventors: Ajaykumar Bunha, Antony P. Chacko, Qingping Chen, Yaru Shi, Philip M. Lessner
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Patent number: 10879010Abstract: Provided is an improved capacitor formed by a process comprising: providing an anode comprising a dielectric thereon wherein the anode comprises a sintered powder wherein the powder has a powder charge of at least 45,000 ?FV/g; and forming a first conductive polymer layer encasing at least a portion of the dielectric by applying a first slurry wherein the first slurry comprises a polyanion and a conductive polymer and wherein the polyanion and conductive polymer are in a weight ratio of greater than 3 wherein the conductive polymer and polyanion forms conductive particles with an average particle size of no more than 20 nm.Type: GrantFiled: July 26, 2018Date of Patent: December 29, 2020Assignee: KEMET Electronics CorporationInventors: Yaru Shi, Antony P. Chacko, Ajaykumar Bunha, Qingping Chen, Elisabeth Crittendon Key
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Publication number: 20200373089Abstract: The invention is related to an improved capacitor and an improved process for forming a capacitor. The process comprises forming an anode comprising a dielectric on the anode. A cathode layer is then formed on the dielectric wherein the cathode layer comprises a self-doped conductive polymer and a cross-linker wherein a weight ratio of crosslinker to self-doped conductive polymer is at least 0.01 to no more than 2.Type: ApplicationFiled: August 13, 2020Publication date: November 26, 2020Inventors: Yaru Shi, Antony P. Chacko, Chenyi Gu, Ajaykumar Bunha, Qingping Chen
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Publication number: 20200357577Abstract: An improved capacitor is provided wherein the capacitor comprises a conductive polymer layer. The conductive polymer comprises first particles comprising conductive polymer and polyanion and second particles comprising the conductive polymer and said polyanion wherein the first particles have an average particle diameter of at least 1 micron to no more than 10 microns and the second particles have an average particle diameter of at least 1 nm to no more than 600 nm.Type: ApplicationFiled: July 28, 2020Publication date: November 12, 2020Inventors: Ajaykumar Bunha, Antony P. Chacko, Yaru Shi, Qingping Chen, Philip M. Lessner
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Patent number: 10658121Abstract: A capacitor and process for forming the capacitor, is provided wherein the capacitor comprises a conductive polymer layer. The conductive polymer comprises first particles comprising conductive polymer and polyanion and second particles comprising the conductive polymer and said polyanion wherein the first particles have an average particle diameter of at least 1 micron to no more than 10 microns and the second particles have an average particle diameter of at least 1 nm to no more than 600 nm.Type: GrantFiled: October 18, 2017Date of Patent: May 19, 2020Assignee: KEMET Electronics CorporationInventors: Ajaykumar Bunha, Antony P. Chacko, Qingping Chen, Yaru Shi, Philip M. Lessner