United States Gypsum Company

Samar Emami

Salvatore C Immordino, Jr

Christopher R Nelson

David D Pelot

Robert H Negri

Christopher Robert Nelson

Jeffrey F Grussing

John Jason Roxburgh

Srinivas Veeramasuneni

William Rago

Charles W Cochran

Trevor S Rische

Antonio Contreras

Juan Carlos Ruiz Castaneda

Juan Huitzil

Edgar R De La Rosa Cruz

Jorge A Garcia Torres

Miguel Gama Goicochea

Juan Carlos Ruiz Castañeda

Juan Carlos Ruiz CASTAÑEDA

Method of making foamed gypsum slurry having 15 to 90 volume percent gas bubbles including: passing first slurry including water and on dry basis 50 to 98 wt. % calcium sulfate hemihydrate, 1 to 50 wt. % calcium carbonate, and 0.1 to 10 wt. % cellulose thickener via a first hose to a Wye connector conduit first inlet opening at Rate C and passing alum solution via a second hose to a second inlet opening of the conduit at Rate D to create combined mixed stream passing from the conduit to a static mixer for mixing for Time 3 to activate at least a portion of the calcium carbonate and alum to generate COand create the foamed gypsum slurry; transferring the slurry from the mixer to a cavity between two wall boards via a third hose. Allowing the slurry in the cavity to expand, harden and dry.

Method for making a lightweight gypsum composition with internally generated foam and products made from same

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.

A joint tape embedding apparatus configured to determine the bonding and/or 'feel' of embedding joint tape into a dry wall or wall board joint using a particular joint compound. The joint embedding apparatus is configured to allow the same user or different users to accurately repeat the determination of the bonding and/or 'feel' attributes of the joint compound.

Joint tape embedding apparatus, system, and method

Methods of treating lime bucking in a plaster slurry are described. The method involves providing a slurry exhibiting lime bucking having a cone penetration of less than 10 mm at a consistency of 60 cc, comprising: water; calcium sulfate hemihydrate; and hydrated lime; and mixing an effective amount of a dispersant comprising a low intensity dispersant into the slurry so that the cone penetration increases and wherein the cone penetration is 10 mm or more at 10 minutes after addition of the dispersant at a consistency of 60 cc; and applying the plaster slurry containing the dispersant to a substrate. Veneer plaster dry component mixtures having reduced lime bucking when made into a slurry containing a low intensity dispersant, or hydrated lime coated with wax or a dibenzoate plasticizer are also described.

Compositions and methods for reducing lime bucking in plaster products

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Chicago, IL, United States of America

Samar Emami