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Class Information
Number: 156/39
Name: Adhesive bonding and miscellaneous chemical manufacture > Methods > Plaster board making
Description: Processes which are directed to making bodies having at least three layers, at least one of whose intermediate layers is composed of an inorganic settable material of structural strength, and whose outermost layers are of a sheet-like material.

Sub-classes under this class:

Class Number Class Name Patents
156/43 Pore forming in situ 47
156/40 With bending or folding of facing sheet 27
156/42 With embedding of reinforcing material during or subsequent to core formation 84
156/44 With preliminary treatment of facing sheet 67
156/45 With subsequent treatment of plaster board 57
156/41 With water-proofing with added material 31

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8685188 Apparatus and method for fractionating gypsum slurry and method of producing gypsum board Apr. 1, 2014
8591677 Utility materials incorporating a microparticle matrix formed with a setting agent Nov. 26, 2013
8580055 Mixtures and emulsions to reduce energy in gypsum wallboard manufacture Nov. 12, 2013
8568544 Water resistant cementitious article and method for preparing same Oct. 29, 2013
8530064 Mold-inhibiting method and composition comprising dehydroacetic acid or salt thereof Sep. 10, 2013
8475762 Method and apparatus to minimize air-slurry separation during gypsum slurry flow Jul. 2, 2013
8470461 Light weight gypsum board Jun. 25, 2013
8444787 Methods of and systems for adding a high viscosity gypsum additive to a post-mixer aqueous dispersion of calcined gypsum May. 21, 2013
8445101 Sound attenuation building material and system May. 21, 2013
8413333 Method for making an asymmetrical concrete backerboard Apr. 9, 2013
8388926 System and method for the production of gypsum using heat recovery Mar. 5, 2013
8382923 Apparatus and method for manufacturing gypsum board Feb. 26, 2013
8377199 Gypsum based compositions Feb. 19, 2013
8337993 Low embodied energy wallboards and methods of making same Dec. 25, 2012
8323429 Method for preparing three-dimensional plaster objects Dec. 4, 2012
8317914 Fiber cement board with modified fiber Nov. 27, 2012
8303709 Gypsum-containing product Nov. 6, 2012
8298332 Lightweight cementitious compositions and building products and methods for making same Oct. 30, 2012
8262820 Method of water dispersing pregelatinized starch in making gypsum products Sep. 11, 2012
8257524 Method and apparatus for creasing facing material used in the manufacture of wallboard Sep. 4, 2012
8257525 Production method for hydraulic binder-based, tapered-edge boards Sep. 4, 2012
8241419 Fiber cement board with modified fiber Aug. 14, 2012
8216360 Gypsum building boards Jul. 10, 2012
8197952 High starch light weight gypsum wallboard Jun. 12, 2012
8177541 Gypsum board forming device with improved slurry spread May. 15, 2012
8142915 Foamed slurry and building panel made therefrom Mar. 27, 2012
8137490 Process of manufacturing cement based armor panels Mar. 20, 2012
8128767 Process for manufacturing gypsum board faced with non-woven glass fiber mat Mar. 6, 2012
8070895 Water resistant cementitious article and method for preparing same Dec. 6, 2011
8057915 Acoustical gypsum board panel and method of making it Nov. 15, 2011
8034203 Gypsum wallboard with improved nail pull strength and the method for making same Oct. 11, 2011
8016960 Methods of and systems for adding a high viscosity gypsum additive to a post-mixer aqueous dispersion of calcined gypsum Sep. 13, 2011
8016961 Gypsum wallboard and method of making same Sep. 13, 2011
7964034 Gypsum-containing product and method for producing same Jun. 21, 2011
7955587 System and method for the production of alpha type gypsum using heat recovery Jun. 7, 2011
7927420 Light weight metal fire door core Apr. 19, 2011
7918950 Low fiber calcination process for making gypsum fiberboard Apr. 5, 2011
7846278 Methods of making smooth reinforced cementitious boards Dec. 7, 2010
7842629 Non-woven glass fiber mat faced gypsum board and process of manufacture Nov. 30, 2010
7819971 Method of using landplaster as a wallboard filler Oct. 26, 2010
RE41592 Method of producing gypsum/fiber board Aug. 31, 2010
7776170 Fire-resistant gypsum panel Aug. 17, 2010
7763134 Facer for insulation boards and other construction boards Jul. 27, 2010
7736720 Composite light weight gypsum wallboard Jun. 15, 2010
7731794 High starch light weight gypsum wallboard Jun. 8, 2010
7718019 Methods of and systems for preparing a heat resistant accelerant slurry and adding the accelerant slurry to a post-mixer aqueous dispersion of calcined gypsum May. 18, 2010
7717997 Integral water resistant fibre-cement May. 18, 2010
7708847 Gypsum based panel and method for making gypsum based panel May. 4, 2010
7704316 Coatings for building products and methods of making same Apr. 27, 2010
7690834 Mixer and mixing method for producing gypsum slurry Apr. 6, 2010

1 2 3 4

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