Michael W Graff

US Patent:

20230055151, Feb 23, 2023

Filed:

Jan 14, 2021

Appl. No.:

17/792815

Inventors:

- St. Paul MN, US
Aaron K. Nienaber - Lake Elmo MN, US
Joseph B. Eckel - Vadnais Heights MN, US
Ronald D. Jesme - Plymouth MN, US
Jacob P. Podkaminer - St. Paul MN, US
Victor Ho - St. Paul MN, US
Sebastian Goris - Inver Grove Heights MN, US
Matthew T. Johnson - Woodbury MN, US
Michael S. Graff - Woodbury MN, US
Steven H. Kong - Woodbury MN, US

International Classification:

H01L 23/373
H01L 23/42

Abstract:

A thermal interface layer includes pluralities of first and second particles dispersed in a polymeric binder at a total loading V in a range of about 40 volume percent to about 70 volume percent. The first and second particles have different compositions. The first particles include one or more of iron or nickel. The second particles include one or more of aluminum, magnesium, silicon, copper, or zinc. The thermal interface layer has a thermal conductivity in a thickness direction of the thermal interface layer in units of W/mK of at least K=5.1−0.17 V+0.002 V.

US Patent:

20200347200, Nov 5, 2020

Filed:

Nov 15, 2018

Appl. No.:

16/760468

Inventors:

- St. Paul MN, US
Jeanne M. Bruss - Cottage Grove MN, US
Bharat R. Acharya - Woodbury MN, US
Brandon A. Bartling - Woodbury MN, US
Michael S. Graff - Woodbury MN, US
Noah O. Shanti - Maplewood MN, US
Fabian Stolzenburg - Woodbury MN, US
Satinder K. Nayar - Woodbury MN, US

International Classification:

C08J 9/28
C08J 9/00
C08K 3/22

Abstract:

Method of making a polymer matrix composite comprising a porous polymeric network structure; and a plurality of particles distributed within the polymeric network structure, the method comprising: combining a thermoplastic polymer, a solvent that the thermoplastic polymer is soluble in, and a plurality of particles to provide a slurry; forming the slurry in to an article; heating the article in an environment to retain at least 90 percent by weight of the solvent, based on the weight of the solvent in the slurry, and inducing phase separation of the thermoplastic polymer from the solvent to provide the polymer matrix composite.

US Patent:

20200258666, Aug 13, 2020

Filed:

Oct 11, 2018

Appl. No.:

16/755641

Inventors:

- St. Paul MN, US
Steven D. Theiss - Woodbury MN, US
Charles L. Bruzzone - Woodbury MN, US
Michael S. Graff - Woodbury MN, US
Benjamin P. Mize - Austin TX, US

International Classification:

H01F 1/153

Abstract:

High frequency power inductor material having first and second opposed major surfaces, comprising a thermosetting binder and a plurality of multilayered flakes dispersed in the high temperature binder, the multilayered flakes comprising at least two layer pairs, wherein each layer pair comprises a ferromagnetic layer and a dielectric electrical isolation layer so that the ferromagnetic layers are electrically isolated from each other by dielectric layers, and wherein the multilayered flakes are substantially aligned parallel to the first and second major surfaces such that they do not provide an electrically continuous path over a range of greater than 0.5 mm. Exemplary high frequency power inductor materials described herein are useful, for example, as a power inductor in Point of Load converters, low profile inductors for inductive—capacitive (LC) filters (e.g., for global system for mobile communication (GSM) pulse noise suppression in cellular phone speakers), or other applications wherein compact, inductive elements are required on a circuit board.

US Patent:

20190035523, Jan 31, 2019

Filed:

Feb 9, 2017

Appl. No.:

16/077496

Inventors:

- St. Paul MN, US
Michael S. Graff - Woodbury MN, US
Jeffrey M. Florczak - Granite Shoals TX, US
Steven L. Johnson - Brownwood TX, US
Rui Yang - Austin TX, US
Carlos A. Barrios - Woodbury MN, US
Steven D. Theiss - Woodbury MN, US
Kevin W. Gotrik - Hudson WI, US

International Classification:

H01F 1/147
H01F 3/02

Abstract:

A multilayer magnetic sheet is described which comprises a plurality of stacked magnetic component layers separated by first electrically insulating layers. Each of the plurality of magnetic component layers comprises a plurality of isolated magnetic sublayers having a magnetic layer thickness of less than one micron. The multilayer magnetic sheet has a magnetic fraction between about 5% and about 80%; a total magnetic thickness of greater than or equal to 5 microns; and a relative composite permeability of greater than about 20.

US Patent:

20180174723, Jun 21, 2018

Filed:

Dec 19, 2016

Appl. No.:

15/382834

Inventors:

- St. Paul MN, US
Charles L. Bruzzone - Woodbury MN, US
Michael S. Graff - Woodbury MN, US
Derek J. Dehn - Maplewood MN, US
Clint J. Novotny - Minneapolis MN, US

International Classification:

H01F 1/22
C08K 3/34

Abstract:

The present disclosure relates to polymer composites that include a thermoplastic polymer, network structure and a soft, ferromagnetic particulate material. The polymer composites may be used, for example, as magnetic flux field directional materials. The present invention also relates to methods of making the polymer composites, e.g. polymer composite sheets, of the present disclosure. In one embodiment, the present disclosure provides a polymer composite including a thermoplastic polymer, network structure; and a soft, ferromagnetic particulate material distributed within the thermoplastic polymer, network structure. The weight fraction of soft, ferromagnetic particulate material may be between 0.80 and 0.98, based on the total weight of the polymer composite and/or the thermoplastic polymer may have a number average molecular weight between 5×10g/mol to 5×10g/mol.