Christopher L Nelson

US Patent:

6494609, Dec 17, 2002

Filed:

Jul 16, 2001

Appl. No.:

09/905553

Inventors:

James R. Wittbold - Des Plaines IL
Amit P. Duvedi - Morton Grove IL
Mark K. Hemphill - Jarvis, CA
Wayne A. Fleming - Fisherville, CA
Wilford Gary Pittman - Fernandina FL
Kirk S. Moore - Jacksonville FL
Christopher Nelson - Grayslake IL

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

B01F 716

US Classification:

366192, 366194, 366315

Abstract:

An apparatus and method for delivering an additive-enhanced slurry for use in making gypsum wallboard, and configured for connection to a centrifugal mixer with a tangential discharge outlet, includes a conduit having a main inlet in slurry receiving communication with the mixer outlet and extending to a discharge spout for discharging the slurry proximate a wallboard forming area. At least one volume restrictor is associated with the conduit for creating back pressure between the volume restrictor and the outlet for keeping the mixer fill, and at least one pressure reducer associated with the discharge spout and configured for reducing the pressure of the slurry dispensed from the discharge spout. The apparatus is configured for maintaining a generally laminar flow from the mixer outlet to the discharge spout.

US Patent:

6951586, Oct 4, 2005

Filed:

Sep 20, 2002

Appl. No.:

10/251461

Inventors:

Christopher R. Nelson - Grayslake IL, US
Mark B. Scalf - McHenry IL, US

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

B05B007/06

US Classification:

118315, 118300, 118324, 427421, 427422, 427424

Abstract:

The disclosed invention consists of an improved gypsum based, cellulosic containing board and method for applying a resin to an untreated board at a spray station where pMDI resin is sprayed onto the front and back side of the board. A resin distribution system is used to supply the spray nozzles with pMDI. Optionally, a second spray station is included, if desired, to add additional pMDI resin over the surface of the board to achieve complete coverage. The improvement is an increased water resistance and flexural strength.

US Patent:

7175426, Feb 13, 2007

Filed:

Feb 27, 2004

Appl. No.:

10/788871

Inventors:

Michael L. Bolind - Ingleside IL, US
Warner J. Dundas - Des Plaines IL, US
Michael J. Porter - Akron IN, US
Christopher R. Nelson - Grayslake IL, US
Subhash Deodhar - Vernon Hills IL, US

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

F27B 15/02

US Classification:

432 16, 106722, 106772

Abstract:

An apparatus for calcining gypsum including a housing having a bottom wall, open top, and a plurality of side walls extending therebetween. A fixture is located adjacent the open top for receiving gypsum from a source and transferring the gypsum into the housing. At least one burner is connected to the housing and operable for combusting an air-fuel mixture to heat the gypsum. At least one serpentine burner conduit extends from the burner through the housing and terminates through a support floor of the apparatus. The exhaust flow is then directed through a fluidization pad and into the gypsum to further heat the gypsum product. An agitation mechanism is operable to mix the gypsum adjacent the fluidization pad to prevent pockets of gypsum from coagulating and preventing fluidization of the gypsum.

US Patent:

7309516, Dec 18, 2007

Filed:

Nov 1, 2004

Appl. No.:

10/978572

Inventors:

Christopher R. Nelson - Grayslake IL, US
Mark B. Scalf - McHenry IL, US

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

B05D 5/00

US Classification:

4274211, 427424, 4274274, 4274277, 4273855, 4273936, 1525706

Abstract:

The disclosed invention consists of an improved gypsum based, cellulosic containing board and method for applying a resin to an untreated board at a spray station where pMDI resin is sprayed onto the front and back side of the board. A resin distribution system is used to supply the spray nozzles with pMDI. Optionally, a second spray station is included, if desired, to add additional pMDI resin over the surface of the board to achieve complete coverage. The improvement is an increased water resistance and flexural strength.

US Patent:

7381261, Jun 3, 2008

Filed:

Dec 21, 2006

Appl. No.:

11/644596

Inventors:

Christopher R. Nelson - Lindenhurst IL, US

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

C04B 14/18
B05D 1/00
B28B 1/14
B28B 1/16
B32B 13/08
B32B 37/00
B32B 37/15

US Classification:

106675, 106678, 106783, 106DIG 2, 156 39, 156 45, 264333, 432 13

Abstract:

This invention is directed to a method of reducing the water demand of expanded perlite that includes obtaining a vibrating screen supported at an angle and placing expanded perlite on the vibrating screen. The expanded perlite is moved over the screen past toward a burner at a rate that heats the expanded perlite to a temperature sufficient to anneal it. The expanded perlite is then moved away from the burner and allowed to cool. Another embodiment of this invention is directed to a method of making a gypsum product. The method includes annealing perlite by the method described above, then preparing a slurry of calcium sulfate hemihydrate, additives, water and the annealed perlite. The slurry is formed into the shape of the gypsum product and allowed to set. This process is particularly useful in making gypsum panels and acoustical panels that benefit from the use of lightweight materials.

US Patent:

7765813, Aug 3, 2010

Filed:

Jul 15, 2004

Appl. No.:

10/891964

Inventors:

Michael L. Bolind - Ingleside IL, US
Christopher R. Nelson - Third Lake IL, US
Bruce L. Petersen - Lisle IL, US
Michael J. Porter - Hanover Park IL, US

Assignee:

United States Gypsum Company - Chicago IL

International Classification:

F28C 1/00

US Classification:

62121, 62304, 239237, 239380, 210272, 210279, 34 77, 34 90, 16510416, 16510418

Abstract:

The present invention is an apparatus and process for cooling and de-steaming hot calcined stucco used in the production of gypsum boards or bagged plaster. The apparatus is a fluid bed stucco cooler and comprises a cooler housing having a plenum having a stucco inlet and stucco outlet. The stucco cooler includes a rotating disk in the plenum. The rotating disk includes nozzle for spraying fluid, and is attached to a rotable shaft extending from the side of the cooler also includes a fluidization pad and agitator to help to mix the air and the stucco powder to insure fluidization, prevent channeling, and prevent the stucco powder from building up on the various components. The air also forces steam from the hot calcined stucco out through an air outlet located at the top of the stucco cooler, thereby de-steaming the stucco. The stucco flows through the plenum and passes over the cooling coils, thereby cooling the stucco as it reaches the stucco outlet.

US Patent:

20020071954, Jun 13, 2002

Filed:

Dec 8, 2000

Appl. No.:

09/732608

Inventors:

Christopher Nelson - Grayslake IL, US
Mark Scalf - McHenry IL, US

International Classification:

B32B027/00

US Classification:

428/423100

Abstract:

The disclosed invention consists of an improved gypsum based, cellulosic containing board and method for applying a resin to an untreated board at a spray station where pMDI resin is sprayed onto the front and back side of the board. A resin distribution system is used to supply the spray nozzles with pMDI. Optionally, a second spray station is included, if desired, to add additional pMDI resin over the surface of the board to achieve complete coverage. The improvement is an increased water resistance and flexural strength.

US Patent:

20080152559, Jun 26, 2008

Filed:

Dec 20, 2006

Appl. No.:

11/613417

Inventors:

Michael Lawrence Bolind - Ingleside IL, US
Michael J. Porter - Akron IN, US
Christopher Robert Nelson - Lindenhurst IL, US

Assignee:

UNITED STATES GYPSUM COMPANY - Chicago IL

International Classification:

C04B 11/02
C01F 11/46

US Classification:

423171, 423555

Abstract:

A process is disclosed for making dead burn calcium sulfate anhydrite. The process includes a slurry calcination step to produce calcium sulfate anhydrite followed by removing free water from the anhydrite while avoiding substantial rehydration. Also disclosed are dead burn calcium sulfate anhydrite particles with high aspect ratios, e.g. fibers having an average aspect ratio of at least 4:1, or very fine particle size, e.g., at or below 2 micrometers average, combined with very low water content, e.g., less than 0.5, preferably less than 0.3, wt. % water. These particles are typically useful as fillers.