Dwight J Erickson

US Patent:

7399330, Jul 15, 2008

Filed:

Oct 18, 2005

Appl. No.:

11/252955

Inventors:

Mark G. Schwabel - Lake Elmo MN, US
Dwight D. Erickson - Oakdale MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

B24D 11/00
B24D 3/00
B24D 3/20
C09K 3/14

US Classification:

51307, 51308, 51309, 51295, 51297, 451526, 451524, 451540, 428378, 428375, 428388, 428404, 427180

Abstract:

An abrasive agglomerate includes a plurality of abrasive grains bonded together in a three-dimensional structure by a substantially continuous, non-porous inorganic binder, wherein the abrasive grains have an average size of between about 0. 5 microns and about 1500 microns, the inorganic binder is less than about 75 percent, by weight, of the abrasive agglomerate, and the bulk density of the abrasive agglomerate is less than about 90 percent of the bulk density of the abrasive grains.

US Patent:

7887608, Feb 15, 2011

Filed:

Jun 13, 2008

Appl. No.:

12/138498

Inventors:

Mark G. Schwabel - Lake Elmo MN, US
Dwight D. Erickson - Oakdale MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

B24D 3/02

US Classification:

51307, 428357

Abstract:

An abrasive agglomerate includes a plurality of abrasive grains bonded together in a three-dimensional structure by a substantially continuous, non-porous inorganic binder, wherein the abrasive grains have an average size of between about 0. 5 microns and about 1500 microns, the inorganic binder is less than about 75 percent, by weight, of the abrasive agglomerate, and the bulk density of the abrasive agglomerate is less than about 90 percent of the bulk density of the abrasive grains.

US Patent:

8034137, Oct 11, 2011

Filed:

Dec 17, 2008

Appl. No.:

12/336877

Inventors:

Dwight D. Erickson - Oakdale MN, US
Scott R. Culler - Burnsville MN, US
Negus B. Adefris - Woodbury MN, US
John T. Boden - White Bear Lake MN, US
John D. Haas - Roseville MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

B24D 3/02

US Classification:

51309, 428142, 428148, 428402

Abstract:

Precursor alpha alumina abrasive particles in a mold are subjected to a drying process that cracks or fractures at least a majority of the precursor abrasive particles into at least two pieces thereby producing abrasive shards having a smaller size than the mold cavity from which they were made. The smaller abrasive shards, once formed, could be reassembled like jigsaw puzzle pieces to reproduce the original cavity shape of the mold from which they were made. The cracking or fracturing of the precursor abrasive particles is believed to occur by ensuring that the surface tension of the abrasive dispersion to the walls of the mold is greater than the internal attractive forces of the abrasive dispersion as the abrasive dispersion is dried within the mold cavity.

US Patent:

8123828, Feb 28, 2012

Filed:

Dec 17, 2008

Appl. No.:

12/337001

Inventors:

Scott R. Culler - Burnsville MN, US
Dwight D. Erickson - Oakdale MN, US
Negus B. Adefris - Woodbury MN, US
John T. Boden - White Bear Lake MN, US
John D. Haas - Roseville MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

B24B 1/00
B24D 3/00

US Classification:

51296, 51309

Abstract:

By controlling the process parameters and by using a polymeric production tooling having a plurality of mold cavities, different types of shaped abrasive particles selected from the group consisting of abrasive shards, dish-shaped abrasive particles, and shaped abrasive particles with an opening can be produced from the exact same mold. In one embodiment, the mold comprised a plurality of equilateral triangles and fractured precursor abrasive particles, dish-shaped precursor abrasive particles, or precursor shaped abrasive particles with an opening were produced from the same mold.

US Patent:

8142531, Mar 27, 2012

Filed:

Dec 17, 2008

Appl. No.:

12/337075

Inventors:

Negus B. Adefris - Woodbury MN, US
Dwight D. Erickson - Oakdale MN, US
Scott R. Culler - Burnsville MN, US
John T. Boden - White Bear Lake MN, US
John D. Haas - Roseville MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

B24D 3/02
C09C 1/68
C09K 3/14

US Classification:

51309, 428142, 428329, 428402

Abstract:

Shaped abrasive particles each having a sloping sidewall, each of the shaped abrasive particles comprising alpha alumina and having a first face and a second face separated by a thickness, t. The shaped abrasive particles further comprising either: a draft angle α between the second face and the sloping sidewall, and the draft angle α is between about 95 degrees to about 130 degrees, or the sloping sidewall having a radius, R, between the first face and the second face and the radius, R, is between about 0. 5 to about 2 times the thickness, t.

US Patent:

8142532, Mar 27, 2012

Filed:

Dec 17, 2008

Appl. No.:

12/337112

Inventors:

Dwight D. Erickson - Oakdale MN, US
Scott R. Culler - Burnsville MN, US
Negus B. Adefris - Woodbury MN, US
John T. Boden - White Bear Lake MN, US
John D. Haas - Roseville MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

B24D 3/02
C09C 1/68
C09K 3/14

US Classification:

51309, 428142, 428148, 428329, 428402, 51296, 51308

Abstract:

Abrasive particles which are shaped abrasive particles each with an opening is disclosed. The shaped abrasive particles are formed from alpha alumina and have a first face and a second face separated by a thickness t. The opening in each of the shaped abrasive particles can improve grinding performance by reducing the size of a resulting wear flat, can provide a reservoir for grinding aid, and can improve adhesion to a backing in a coated abrasive article.

US Patent:

8142891, Mar 27, 2012

Filed:

Dec 17, 2008

Appl. No.:

12/336961

Inventors:

Scott R. Culler - Burnsville MN, US
Dwight D. Erickson - Oakdale MN, US
Negus B. Adefris - Woodbury MN, US
John T. Boden - White Bear Lake MN, US
John D. Haas - Roseville MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

B24D 3/00
B32B 5/16

US Classification:

428402, 51309

Abstract:

Abrasive particles comprising dish-shaped abrasive particles each having a sidewall; each of the shaped abrasive particles comprising alpha alumina and having a first face and a second face separated by a thickness, t; and wherein either the first face or the second face is recessed or concave.

US Patent:

8480772, Jul 9, 2013

Filed:

Jun 30, 2010

Appl. No.:

12/827274

Inventors:

Dennis G. Welygan - Woodbury MN, US
Dwight D. Erickson - Woodbury MN, US
John T. Boden - White Bear Lake MN, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

B24D 3/06
C01P 2004/54
C01P 2004/90

US Classification:

51293, 428402

Abstract:

Shaped ceramic articles can be obtained by screen printing the desired shapes from a dispersion of a precursor of the ceramic onto a receiving surface using a transfer assisted technique that applies a differential pressure, at least partially drying the screen printed shapes, and firing them to generate the shaped ceramic articles. Shaped abrasive particles made using lower viscosity sol gels that tended to flow or creep after the screen printing formation were found to have higher grinding performance over screen printed shaped abrasive particles made with higher viscosity sol gels.