Christopher L Nelson

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:

20190217259, Jul 18, 2019

Filed:

Mar 22, 2019

Appl. No.:

16/361551

Inventors:

- CHICAGO IL, US
Peter B. GROZA - Antioch IL, US
Christopher R. NELSON - Lindenhurst IL, US

Assignee:

UNITED STATES GYPSUM COMPANY - CHICAGO IL

International Classification:

B01F 7/00
B29B 7/48
B28B 1/52
B01F 15/02
B28C 5/14
B01F 7/04
B01F 7/08
B28C 5/12
B01F 3/12
B28C 5/40
B28B 5/02
B28B 3/22
B01F 7/06
B01F 13/10

Abstract:

A method in which a stream of dry cementitious powder from a dry powder feeder passes through a dry cementitious powder inlet conduit to feed a first feed section of a fiber-slurry mixer. An aqueous medium stream passes through at least one aqueous medium stream conduit to feed a first mixing section the fiber-slurry mixer. A stream of reinforcing fibers passes from a fiber feeder through a reinforcing fibers stream conduit to feed a second mixing section of the fiber-slurry mixer. The stream of dry cementitious powder, aqueous medium stream, and stream of reinforcing fibers combine in the fiber-slurry mixer to make a stream of fiber-cement mixture which discharges through a discharge conduit at a downstream end of the mixer.

US Patent:

20180099908, Apr 12, 2018

Filed:

Sep 21, 2017

Appl. No.:

15/711583

Inventors:

- Chicago IL, US
Salvatore C. IMMORDINO - Trevor WI, US
Robert H. NEGRI - Lake Villa IL, US
David D. PELOT - Chicago IL, US
Jeffrey F. GRUSSING - Trevor WI, US
Juan Carlos RUIZ CASTAÑEDA - Monterrey, MX
Christopher R. NELSON - Lindenhurst IL, US
John Jason ROXBURGH - Chicago IL, US
Srinivas VEERAMASUNENI - Round Lake IL, US

Assignee:

UNITED STATES GYPSUM COMPANY - Chicago IL

International Classification:

C04B 28/14
C04B 22/06
C04B 22/14
C04B 22/10
C04B 38/10

Abstract:

A gypsum-based composition of calcium sulfate hemihydrate with (a) alum and calcium carbonate and/or (b) zeolite and sodium percarbonate for making foamed gypsum slurry. A method to make foamed gypsum slurry from the composition. A method to make foamed gypsum product from the composition. A cavity wall having a cavity filled with the foamed gypsum product.

US Patent:

20180036693, Feb 8, 2018

Filed:

Jul 28, 2017

Appl. No.:

15/663104

Inventors:

- Chicago IL, US
Peter B. GROZA - Antioch IL, US
Christopher R. NELSON - Lindenhurst IL, US

Assignee:

UNITED STATES GYPSUM COMPANY - Chicago IL

International Classification:

B01F 7/00
B01F 7/04
B01F 7/08
B01F 13/10
B01F 15/02
B28C 5/14
B28C 5/12
B01F 3/12
B01F 7/06

Abstract:

A method in which a stream of dry cementitious powder from a dry powder feeder passes through a dry cementitious powder inlet conduit to feed a first feed section of a fiber-slurry mixer. An aqueous medium stream passes through at least one aqueous medium stream conduit to feed a first mixing section the fiber-slurry mixer. A stream of reinforcing fibers passes from a fiber feeder through a reinforcing fibers stream conduit to feed a second mixing section of the fiber-slurry mixer. The stream of dry cementitious powder, aqueous medium stream, and stream of reinforcing fibers combine in the fiber-slurry mixer to make a stream of fiber-cement mixture which discharges through a discharge conduit at a downstream end of the mixer.

US Patent:

20180036909, Feb 8, 2018

Filed:

Jul 28, 2017

Appl. No.:

15/663044

Inventors:

- Chicago IL, US
Peter B. GROZA - Antioch IL, US
Christopher R. NELSON - Lindenhurst IL, US

Assignee:

UNITED STATES GYPSUM COMPANY - Chicago IL

International Classification:

B28B 5/02
B28B 1/52
C04B 28/14
C04B 14/42
C04B 40/00

Abstract:

A slurry feed apparatus for depositing a slurry upon a moving forming web having a direction of travel, including: a headbox mounted transverse to the direction of travel of the moving web, having a back wall, sidewalls, a concave transverse front wall, an open top, and an open bottom for directing slurry onto the forming web; a moveable dam releasably attached to the back wall, a seal attached to a bottom wall of the dam; and a headbox support system extending from opposed the sidewalls. Also disclosed is a continuous process for depositing a uniform layer of a cementitious slurry containing reinforcing fibers from the headbox onto a traveling web.

US Patent:

20180036911, Feb 8, 2018

Filed:

Jul 28, 2017

Appl. No.:

15/662932

Inventors:

- Chicago IL, US
Peter B. GROZA - Antioch IL, US
Christopher R. NELSON - Lindenhurst IL, US

Assignee:

UNITED STATES GYPSUM COMPANY - Chicago IL

International Classification:

B28C 7/04
B28B 1/52
B28B 13/02
B28C 5/12

Abstract:

A method in which a stream of dry cementitious powder passes through a first conduit and aqueous medium stream passes through a second conduit to feed a slurry mixer to make cementitious slurry. The cementitious slurry passes through a third conduit and a reinforcement fiber stream passes through a fourth conduit to feed a fiber-slurry mixer which mixes the slurry and discrete fibers to make a stream of fiber-slurry mixture. An apparatus for performing the method is also disclosed.

US Patent:

20180036912, Feb 8, 2018

Filed:

Jul 28, 2017

Appl. No.:

15/663007

Inventors:

- Chicago CA, US
Peter B. GROZA - Antioch IL, US
Christopher R. NELSON - Lindenhurst IL, US

Assignee:

UNITED STATES GYPSUM COMPANY - Chicago IL

International Classification:

B28C 7/04
B28B 1/52
B28B 13/02
B28C 5/12

Abstract:

Continuous method including:

US Patent:

20150275701, Oct 1, 2015

Filed:

Sep 24, 2013

Appl. No.:

14/430796

Inventors:

- Racine, WI, US
- Columbus, IN, US
Tony Rousseau - Racine WI, US
Timothy C. Ernst - Columbus IN, US
James Zigan - Versailles IN, US
Christopher Nelson - Columbus IN, US

International Classification:

F01K 23/10
F01K 7/16

Abstract:

A power generation system having a combustion engine with a Rankine bottoming cycle, the system including a first flow path for a process fluid and a second flow path for a working fluid, and a heat exchanger arranged along both the first and the second flow paths to transfer waste heat from the process fluid to the working fluid. The heat exchanger includes a first flow conduit being bounded by a first wall section and configured to convey the process fluid, a second flow conduit to convey the working fluid, the second flow conduit being bounded by a second wall section spaced apart from the first wall section to define a gap therebetween, and a thermally conductive structure arranged within the gap and joined to the first and second wall sections to transfer heat therebetween, the gap being fluidly isolated from both the process fluid and the working fluid.