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公开(公告)号：US20240421477A1
公开(公告)日：2024-12-19
申请号：US18717909
申请日：2022-12-29
Applicant: 3M INNOVATIVE PROPERTIES COMPANY
Inventor： Jaewon Kim , Raymond P. Johnston , John J. Sullivan , Shawn T. Brovold , Matthew C. Messina , Charles D. Hoyle , Kenneth L. Smith , Dipankar Ghosh , Zhonghua Lu , Robert A. Sainati
Abstract: Radar retroreflective (R3) devices including an electromagnetic absorber are provided. The electromagnetic absorber is disposed on selected areas of the device to reduce specular reflection without substantially reducing retroreflection of the device.
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公开(公告)号：US20240040759A1
公开(公告)日：2024-02-01
申请号：US18257040
申请日：2021-12-07
Applicant: 3M INNOVATIVE PROPERTIES COMPANY
Inventor： Adam D. Miller , Sergei A. Manuilov , Michael S. Graff , Dipankar Ghosh
CPC classification number: H05K9/0083 , C08K9/02 , C09C1/0078 , C08K2201/01 , C01P2006/42 , C01P2006/40 , C01P2004/80 , C01P2004/20
Abstract: A composite comprising a polymeric matrix and EM absorbers dispersed within the polymeric matrix. Each EM absorber comprises a dielectric flake, and a continuous magnetic coating on at least one major surface of the dielectric flake. The EM absorbers function as dielectric and magnetic absorbers in the 1-100 GHz frequency range. The composite can be used as an electromagnetic shielding article to mitigate electromagnetic interference in, for example, high speed, high frequency (HSHF) consumer electronics.
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公开(公告)号：US11875919B2
公开(公告)日：2024-01-16
申请号：US17438315
申请日：2020-02-19
Applicant: 3M INNOVATIVE PROPERTIES COMPANY
Inventor： Dipankar Ghosh , John Phan
IPC: H01B3/00
CPC classification number: H01B3/004
Abstract: A multilayer electric field grading article comprises first and second layers forming a discrete interface. The first layer comprises a first electric field grading composition comprising first particles dispersed in a first matrix material. The second layer comprises a second electric field grading composition comprising second particles, compositionally different than the first particles, dispersed in a second matrix material. The first and second layers have respective first and second degrees of nonlinearity between respective first and second onset voltages and corresponding first and second breakdown voltages. The first and second layers taken together have a combined onset voltage that is higher than the first and second onset voltages, and the first and second layers taken together have a greater combined degree of nonlinearity than each of the first and second degrees of nonlinearity taken individually. A method of reducing electric field stress at a joint or termination of a substrate includes applying the multilayer electric field grading article to a surface of a substrate.
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公开(公告)号：US11873403B2
公开(公告)日：2024-01-16
申请号：US17054208
申请日：2019-05-14
Applicant: 3M INNOVATIVE PROPERTIES COMPANY
Inventor： Dipankar Ghosh
IPC: C08L83/04 , H02G15/064 , H02G15/103 , C08K3/22
CPC classification number: C08L83/04 , H02G15/064 , H02G15/103 , C08K2003/2248
Abstract: Electric field grading compositions comprise a particulate cupric oxide dispersed in a matrix material, wherein the electric field grading composition has a threshold voltage, a breakdown voltage, and exhibits a reversible electric field switchable current-voltage relationship that substantially follows the equation:
I=kVα
wherein: I is current in amperes; k is a constant greater than 0; V is applied voltage in volts, wherein V is between the threshold voltage and the breakdown voltage, inclusive; and α is a real number greater than 1. The electric field grading composition is useful for reducing electric field stress at a joint or termination of a conductive substrate. Articles including the electric field grading disposed on a surface of a conductive substrate are also disclosed.-
公开(公告)号：US11749900B2
公开(公告)日：2023-09-05
申请号：US17044054
申请日：2019-04-04
Applicant: 3M Innovative Properties Company
Inventor： Dipankar Ghosh , Jaewon Kim , Stephen J. Etzkorn , Ronald D. Jesme , Mohsen Salehi , Guanglei Du , John A. Wheatley
CPC classification number: H01Q17/004 , G01S7/03 , H01Q1/3233 , H01Q1/38 , H01Q1/421 , H05K1/0237 , G01S7/027
Abstract: Radar standing wave dampening systems and components are described. In particular, systems and components including an absorber composite including at least one of ceramic filler, magnetic filler, or conductive filler materials are described. Such components can reduce the intensity of standing waves and may also be combined in systems with one or more gradient permittivity tapes or films.
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Patent Agency Ranking
公开(公告)号：US20220392662A1
公开(公告)日：2022-12-08
申请号：US17765195
申请日：2020-09-28
Applicant: 3M INNOVATIVE PROPERTIES COMPANY
Inventor： Dipankar Ghosh , Andrew C. Lottes , Gengbang Jin
Abstract: An article incorporates an enhanced dielectric breakdown strength and enhanced energy storage density composite material comprising a polymer matrix and hybrid filler particles comprising graphene oxide (GO) and a thermally conductive ceramic material having a thermal conductivity of at least 2 W/(m#K). The hybrid filler particles are distributed within the polymer matrix in a weight percentage less than about 15 weight percent.
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公开(公告)号：US20220189654A1
公开(公告)日：2022-06-16
申请号：US17438315
申请日：2020-02-19
Applicant: 3M INNOVATIVE PROPERTIES COMPANY
Inventor： Dipankar Ghosh , John Phan
IPC: H01B3/00
Abstract: A multilayer electric field grading article comprises first and second layers forming a discrete interface. The first layer comprises a first electric field grading composition comprising first particles dispersed in a first matrix material. The second layer comprises a second electric field grading composition comprising second particles, compositionally different than the first particles, dispersed in a second matrix material. The first and second layers have respective first and second degrees of nonlinearity between respective first and second onset voltages and corresponding first and second breakdown voltages. The first and second layers taken together have a combined onset voltage that is higher than the first and second onset voltages, and the first and second layers taken together have a greater combined degree of nonlinearity than each of the first and second degrees of nonlinearity taken individually. A method of reducing electric field stress at a joint or termination of a substrate includes applying the multilayer electric field grading article to a surface of a substrate.
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公开(公告)号：US20210050673A1
公开(公告)日：2021-02-18
申请号：US17044054
申请日：2019-04-04
Applicant: 3M INNOVATIVE PROPERTIES COMPANY
Inventor： Dipankar Ghosh , Jaewon Kim , Stephen J. Etzkorn , Ronald D. Jesme , Mohsen Salehi , Guanglei Du , John A. Wheatley
Abstract: Radar standing wave dampening systems and components are described. In particular, systems and components including an absorber composite including at least one of ceramic filler, magnetic filler, or conductive filler materials are described. Such components can reduce the intensity of standing waves and may also be combined in systems with one or more gradient permittivity tapes or films.
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公开(公告)号：US10411320B2
公开(公告)日：2019-09-10
申请号：US15565536
申请日：2016-04-11
Applicant: 3M INNOVATIVE PROPERTIES COMPANY
Inventor： Christian Weinmann , Jaewon Kim , Justin M. Johnson , Dipankar Ghosh , Craig W. Lindsay
Abstract: At least some aspects of the present disclosure feature a communication device for propagating an electromagnetic wave around a blocking structure. The communication device includes a passive coupling device to capture the electromagnetic wave, and a waveguide electromagnetically coupled to the coupling device. The waveguide is disposed around the blocking structure. The waveguide has a resonance frequency matched with the coupling device. The waveguide is configured to propagate the electromagnetic wave captured by the coupling device.
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公开(公告)号：US10139288B2
公开(公告)日：2018-11-27
申请号：US14917570
申请日：2014-09-11
Applicant: 3M INNOVATIVE PROPERTIES COMPANY
Inventor： Dipankar Ghosh , Myungchan Kang , Jaewon Kim
IPC: G01K7/00 , G01K1/00 , G01K7/34 , G01K7/38 , H01B3/12 , C01G23/00 , C01G25/00 , C01G27/00 , C04B35/468 , H01G4/12 , H01L37/02 , H01G7/04 , H01G7/06 , H02G1/00 , C08K3/22
Abstract: A passive temperature-sensing apparatus, which includes a capacitive sensing element that includes a capacitive sensing composition that includes a ferroelectric ceramic material that exhibits a measurable electrical Curie temperature that is below 30 degrees C. The capacitive sensing composition exhibits a negative slope of capacitance versus temperature over the temperature range of from 30 degrees C. to 150 degrees C.
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