James R Wittbold

6494609, Dec 17, 2002

Jul 16, 2001

09/905553

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

United States Gypsum Company - Chicago IL

B01F 716

366192, 366194, 366315

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.

6874930, Apr 5, 2005

Dec 13, 2002

10/318636

James R. Wittbold - Des Plaines IL, US
Amit P. Duvedi - Morton Grove IL, US
Michael P. Shake - Oak Lawn IL, US
Mark K. Hemphill - Monroe NY, US
Wayne A. Fleming - Fisherville, CA

United States Gypsum Company - Chicago IL

B01F007/16
B01F015/02

366192, 366194, 366315

An apparatus configured for connection to a mixer for receiving a slurry and altering the flow characteristics of the slurry includes a conduit having a main inlet in slurry receiving communication with the mixer outlet and extending to a spout for discharging the slurry, at least one conduit restrictor associated with the conduit for creating back-pressure between the conduit restrictor and the mixer outlet for keeping the mixer full, 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.

7007914, Mar 7, 2006

May 14, 2004

10/846131

Bruce Lynn Petersen - Lisle IL, US
Richard James Haszel - Mundelein IL, US
James R. Wittbold - Des Plaines IL, US

United States Gypsum Company - Chicago IL

F16K 7/04

251 4

An apparatus and method for controlling the flow of a slurry is provided which includes using a constrictor valve on a mixing and dispensing apparatus. The constrictor valve includes a first guide plate and a second guide plate that are spaced a distance apart along the length of the conduit. Extending between the two guide plates, a plurality of elongate members have first and second ends engaged on the first and second guide plates. Upon rotation of at least one of the first and second guide plates, the elongate members are configured to impart pressure on, and constrict the conduit.

7296919, Nov 20, 2007

Dec 14, 2005

11/302673

Bruce Lynn Petersen - Lisle IL, US
Richard James Haszel - Mundelein IL, US
James R. Wittbold - Des Plaines IL, US

United States Gypsum Company - Chicago IL

B01F 15/02

366 3, 366192, 366194

A method for providing a smoothly mixed slurry to a web is provided which includes inserting calcined gypsum and water into a mixer (), agitating the contents of the mixer () to form an aqueous dispersion of the calcined gysum, and passing the agitated contents from an outlet () of the mixer () into a slurry dispensing apparatus () including a flexible, resilient conduit (). Additionally, the method includes the step of creating a back-pressure on the mixture in the slurry dispensing apparatus by constricting the conduit (). The constricting of the conduit () is effected by a constrictor valve () located on the conduit ().

7718019, May 18, 2010

Apr 27, 2005

11/116549

James R. Wittbold - Des Plaines IL, US
Brent Groza - Grayslake IL, US

United States Gypsum Company - Chicago IL

B29C 65/00
B32B 13/00
B32B 37/00
B32B 1/00
B32B 29/00
B32B 3/18
B32B 5/20
C04B 9/04
C04B 11/00
C04B 28/14
H05B 6/00

156 39, 156 40, 156 42, 156 43, 106772, 106776, 264426

Methods and systems are provided for preparing a heat resistance accelerator (HRA) slurry. Also provided are methods and systems for introducing a HRA slurry to an aqueous dispersion of calcined gypsum in a discharge apparatus downstream of a stucco mixer in which the dispersion was prepared. These methods and systems are useful in the production of various gypsum products such as board including wallboard and ceiling tiles.

7875114, Jan 25, 2011

Aug 17, 2007

11/893758

James R. Wittbold - Des Plaines IL, US
Bruce Lynn Petersen - Lisle IL, US
Alfred Li - Naperville IL, US

United States Gypsum Company - Chicago IL

C04B 11/00

106772, 106778, 106823

A gypsum slurry is described that includes water, a hydraulic component comprising at least 50% calcined gypsum by weight based on the dry weight of the hydraulic component, foam, a defoamer, a polycarboxylate dispersant having olefinic unsaturated mono-carboxylic acid moieties and (poly)oxyalkylene moieties, a first portion of a retarder and a second portion of a retarder. In some embodiments of the invention, the defoamer is combined with the dispersant prior to being added to the gypsum slurry. The defoamer and dispersant can be added as a physical mixture, wherein the defoamer is attached onto the dispersant polymer, or a combination thereof. In some embodiments, a gypsum building panel is made from the gypsum slurry.

8016960, Sep 13, 2011

Apr 27, 2005

11/116809

James R. Wittbold - Des Plaines IL, US
W. David Song - Gurnee IL, US

United States Gypsum Company - Chicago IL

B29C 65/00
B32B 13/00
B32B 37/00
C04B 9/04
C04B 11/00
C04B 28/14
B01F 15/02

156 39, 106772, 106773, 106774, 106775, 106776, 366192, 366193

Provided are methods and systems for introducing a wet gypsum accelerator or other high viscosity production additive to an aqueous dispersion of calcined gypsum in a discharge apparatus downstream of a stucco mixer in which the dispersion was prepared. These methods and systems are useful in the production of various gypsum products such as board including wallboard and ceiling tiles.

8088218, Jan 3, 2012

Aug 17, 2007

11/893759

David R. Blackburn - Barrington IL, US
Runhai Lu - Vernon Hills IL, US
Sharon L. Tracy - Buffalo Grove IL, US
Qingxia Liu - Vernon Hills IL, US
James R. Wittbold - Des Plaines IL, US
Bruce Lynn Petersen - Lisle IL, US
Alfred Li - Naperville IL, US
John L. Fall - Bedford IN, US
Michael P. Shake - Johnsburg IL, US
Chris Lee - Mount Prospect IL, US

United States Gypsum Company - Chicago IL

C04B 11/00

106772, 106778

A gypsum slurry is described that includes water, a hydraulic component comprising at least 50% calcined gypsum by weight based on the dry weight of the hydraulic component, foam, a defoamer and a polycarboxylate dispersant. In some embodiments of the invention, the defoamer is combined with the dispersant prior to being added to the gypsum slurry. The defoamer and dispersant can be added as a physical mixture, wherein the defoamer is attached onto the dispersant polymer, or a combination thereof. In some embodiments, a gypsum building panel is made from the gypsum slurry.