Craig Owen Hoff from Wayzata, MN, age 73

Process For Preparing A Multi-Layer Article Having A Fluoroplastic Layer And An Elastomer Layer
view source
US Patent:

6773755, Aug 10, 2004
Filed:

Nov 15, 2001
Appl. No.:

09/980749
Inventors:

Tatsuo Fukushi - Woodbury MN
Robert E. Kolb - Afton MN
Craig R. Hoff - Champlin MN
Steven J. Wellner - Afton MN
Attila Molnar - Vadnais Heights MN
Assignee:

3M Innovative Properties Company - St. Paul MN
International Classification:

B05D 138
US Classification:

427379, 4273855, 4274071
Abstract:

A method for enhancing the bond strength between a VDF-containing fluoroplastic layer and an elastomer layer of a multi-layer article. A VDF-containing fluoroplastic composition is applied to the surface of a precursor article that includes a curable elastomer layer to form a fluoroplastic layer. Prior to application of the fluoroplastic composition, the curable elastomer layer is thermally insulated to prevent it from undergoing substantial heating. Following application, the fluoroplastic layer is heated and the curable elastomer layer is cured (e. g. , thermally cured). Preferably, the elastomer cure occurs separately from and subsequent to heating the fluoroplastic layer. The combination of thermally insulating the curable elastomer layer prior to application of the fluoroplastic composition and heating the fluoroplastic layer following application of the fluoroplastic composition results in formation of a strong bond between the fluoroplastic and elastomer layers upon cure.

Composite Articles And Methods Of Making The Same
view source
US Patent:

20050276945, Dec 15, 2005
Filed:

Jun 9, 2004
Appl. No.:

10/864206
Inventors:

Mark Muggli - West St. Paul MN, US
Brian Spiewak - Inver Grove Heights MN, US
Craig Hoff - Corcoran MN, US
Katherine Graham - Roseville MN, US
Kevin Doyle - Woodbury MN, US
Maria Dillon - St. Paul MN, US
Mark Williams - Cottage Grove MN, US
Todd R. Williams - Lake Elmo MN, US
Travis B. Hoium - Moorhead MN, US
Matthew Michel - St. Paul MN, US
International Classification:

B32B001/08
US Classification:

428036910, 428119000
Abstract:

Composite articles having two interlocked different thermoplastic layers, and methods for making the same.

Composite Article Having A Tie Layer And Method Of Making The Same
view source
US Patent:

20050276985, Dec 15, 2005
Filed:

Jun 9, 2004
Appl. No.:

10/864838
Inventors:

Mark Muggli - West St. Paul MN, US
Brian Spiewak - Inver Grove Heights MN, US
Craig Hoff - Corcoran MN, US
Katherine Graham - Roseville MN, US
Kevin Doyle - Woodbury MN, US
Maria Dillon - St. Paul MN, US
Mark Williams - Cottage Grove MN, US
Todd Williams - Lake Elmo MN, US
Travis Hoium - Moorhead MN, US
Matthew Michel - St. Paul MN, US
International Classification:

B32B027/08
US Classification:

428421000, 428520000
Abstract:

Composite articles have two polymeric layers of different compositions bonded together by adhesive and mechanical means.

Fluoropolymer Multi-Layer Articles
view source
US Patent:

20120021226, Jan 26, 2012
Filed:

Dec 15, 2008
Appl. No.:

12/809093
Inventors:

Mark W. Muggli - Emmerting, DE
Shaun P. Duhaime - Maplewood MN, US
Craig R. Hoff - Corcoran MN, US
Mark J. Williams - Cottage Grove MN, US
Gregg D. Dahlke - St. Paul MN, US
International Classification:

B32B 27/08
US Classification:

428421
Abstract:

Provided is a multilayer article having a partially fluorinated or a perfluorinated fluoroplastic layer, a layer that comprises a copolymer comprising interpolymerized units derived from at least one monomer having a glycidyl functional group, and a substrate. The second layer is disposed between the first layer and the substrate layer and adhesively bonds the first layer and substrate layer. Optionally, there is provided a third layer including a perfluoroplastic, where the first layer is disposed between the second layer and the third layer and adhesively bonds the second layer to the third layer. Also provided are methods of making multilayer articles and methods of using multilayer articles.

Illumination Waveguide And Method For Producing Same
view source
US Patent:

58988106, Apr 27, 1999
Filed:

Apr 4, 1997
Appl. No.:

8/832653
Inventors:

Douglas A. Devens - St. Paul MN
David J. Lundin - Woodbury MN
Craig R. Hoff - Champlin MN
Paul F. Tuckner - Woodbury MN
Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN
International Classification:

G02B 602
US Classification:

385123
Abstract:

An illumination waveguide that includes: a core having a cross-section in which the shortest dimension of the cross-section is at least one millimeter; and a cladding surrounding the core that includes a polymer having an optically smooth inner surface.