David W Stegink, Age 602285 Field Stone Dr, Saint Paul, MN 55120

2005006, Mar 24, 2005

Sep 18, 2003

10/666626

David Mekala - Maplewood MN, US
David Stegink - Mendota Heights MN, US
Moses David - Woodbury MN, US
Joseph Frisk - Oakdale MN, US

H01M004/94
H01M004/86
B05D005/12
B32B027/28
H01M004/96

429042000, 429044000, 427115000, 428421000

The present invention provides a fuel cell gas diffusion layer comprising a hydrophilic surface layer having a thickness of no more than 1 micron, and, thereunder, a hydrophobic second layer comprising a fluoropolymer having a thickness of at least 5 microns. Additionally, the present invention provides a method of making a fuel cell gas diffusion layer comprising the steps of a) providing a carbon fiber construction; b) coating at least the upper surface of the carbon fiber construction with composition which comprises a fluoropolymer; and c) exposing the upper surface to at least one plasma, such as a silane plasma, so as to generate a hydrophilic surface layer having a thickness of no more than 1 micron. The present invention also provides a method additionally comprising the step of partially covering the upper surface with a mask having windows according to a pattern, such that the hydrophilic surface layer is applied according to the pattern. The present invention also provides a method wherein the carbon fiber construction is provided as a roll good and the step of exposing said upper surface to at least one plasma is performed in continuous roll-to-roll fashion.

2006007, Apr 13, 2006

Oct 8, 2004

10/961263

David Stegink - Mendota Heights MN, US
David Mekala - Maplewood MN, US

H01M 2/08
H01M 8/10
H01M 4/94
B05D 5/12

429035000, 429036000, 429030000, 429044000, 427115000

A subgasket for a membrane electrode assembly is deposited on a surface of a MEA component and cured in situ. A membrane electrode subassembly includes a polymer electrolyte membrane, a gas diffusion layer and a catalyst layer between the polymer electrolyte membrane and the gas diffusion layer. The membrane electrode subassembly includes a subgasket, disposed over one or more components of the membrane electrode subassembly. The subgasket is made of a layer of material that is depositable and curable in situ. A peripheral edge of the gas diffusion layer overlaps the subgasket.

2011002, Feb 3, 2011

Oct 18, 2010

12/906567

David R. MEKALA - Maplewood MN, US
David W. Stegink - Mendota Heights MN, US
Moses M. David - Woodbury MN, US
Joseph W. Frisk - Oakdale MN, US

C08J 7/18

427490

The present invention provides a method of making a fuel cell gas diffusion layer comprising the steps of a) providing a carbon fiber construction; b) coating at least the upper surface of the carbon fiber construction with composition which comprises a fluoropolymer; and c) exposing the upper surface to at least one plasma, such as a silane plasma, so as to generate a hydrophilic surface layer having a thickness of no more than 1 micron. The present invention also provides a method additionally comprising the step of partially covering the upper surface with a mask having windows according to a pattern, such that the hydrophilic surface layer is applied according to the pattern. The present invention also provides a method wherein the carbon fiber construction is provided as a roll good and the step of exposing said upper surface to at least one plasma is performed in continuous roll-to-roll fashion.

5549267, Aug 27, 1996

Jan 10, 1994

8/179610

June M. Armbruster - River Falls WI
Willem V. Bastiaens - Medina MN
Joseph P. Callahan - St. Paul MN
Steve W. Moris - Woodbury MN
David W. Stegink - Mendota Heights MN

Minnesota Mining and Manufacturing Company - St. Paul MN

B41J 1102

2484422

A frame assembly for use on a device such a computer monitor having a front viewed surface surrounded by a housing. The frame assembly includes a stiff frame having generally planar front and rear surfaces that includes elongate border portions having inner edge surfaces that define an opening through the frame corresponding in shape to the front viewed surface. The rear surface of the frame can be attached along the front surface of the housing with the opening in the frame aligned with the front viewed surface, and a layer of repositionable pressure sensitive adhesive adhered to the frame is accessible along the front surface of the frame so that sheets of paper and other objects can be releasably adhered thereto. The frame assembly can be supplied as a part of a composite that can provide other separable smaller bulletin boards or frames that also can have pressure sensitive adhesive accessible along their front surfaces.

5286837, Feb 15, 1994

Dec 8, 1992

7/986665

Thomas H. Barrows - Cottage Grove MN
Myhanh T. Truong - Blaine MN
Paul R. Suszko - Cottage Grove MN
David W. Stegink - Mendota Heights MN

Minnesota Mining and Manufacturing Company - St. Paul MN

C08G 7310
C08G 6368

528291

Process for treating poly(esteramides) to improve the heat and storage stability thereof. Polymer is optionally suspended in a liquid medium, treated with an amide group-containing solvent, and then separated from the solvent and liquid medium (if any). Also, poly(esteramides) treated in this process and devices and articles comprising such poly(esteramides).