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    Fire resistant gypsum board and related methods
    5.
    发明授权
    Fire resistant gypsum board and related methods 有权

    公开(公告)号：US11834375B2

    公开(公告)日：2023-12-05

    申请号：US17156258

    申请日：2021-01-22

    Applicant: United States Gypsum Company

    Inventor： Qinghua Li ,  Mark K. Hemphill ,  Naveen Punati

    IPC: B32B3/10 ,  C04B28/14 ,  C04B14/20 ,  B28B1/00 ,  B28B19/00 ,  B32B13/08 ,  C04B111/28 ,  C04B111/00

    CPC classification number: C04B28/14 ,  B28B1/008 ,  B28B19/0015 ,  B28B19/0092 ,  B32B13/08 ,  C04B14/202 ,  B32B2264/102 ,  B32B2307/3065 ,  B32B2607/00 ,  C04B2111/00629 ,  C04B2111/285

    Abstract: Disclosed are a composite gypsum board and a method of preparing composite gypsum board. The board contains a set gypsum core sandwiched between two cover sheets. The core is formed from a slurry containing stucco, water, and optional ingredients such as foaming agent, accelerator, retarder, polyphosphate, starch, and dispersant, and core intumescent material. The board also contains at least one skim coat and/or hard edges. A face skim coat layer can be included on one side of the core, facing a face cover sheet. A back skim coat layer can be included on the other side of the core, facing a back cover sheet. Hard edges are known in the art and can be formed, e.g., continuously from a stucco slurry for forming the face and/or back skim coats. Preferably, the back skim coat layer and/or the hard edges are formed from a slurry containing stucco, water, skim coat or edge intumescent material (which have the same desired characteristics), and other optional additives as desired. The skim coat or edge intumescent material can be composed of the same material as the core intumescent material, if desired, but the skim coat and/or edge intumescent material is present in a higher relative concentration in its respective slurry than the amount of core intumescent material in the core slurry. Examples of suitable intumescent materials include expandable vermiculite (e.g., No. 4 or No. 5 according to the US naming system, or combinations thereof), expandable graphite, perlite, or any combination thereof.

    PLASTICIZER DEDUSTING AGENTS FOR JOINT COMPOUNDS
    6.
    发明申请
    PLASTICIZER DEDUSTING AGENTS FOR JOINT COMPOUNDS 有权

    公开(公告)号：US20210017082A1

    公开(公告)日：2021-01-21

    申请号：US16812827

    申请日：2020-03-09

    Applicant: UNITED STATES GYPSUM COMPANY

    Inventor： Alexander J. Donovan ,  Tyler Kincaid ,  David Pelot ,  Richard B. Stevens ,  Robert H. Negri ,  Naveen Punati

    IPC: C04B28/14 ,  C04B24/04 ,  C04B24/38

    Abstract: A joint compound including calcium sulfate hemihydrate and/or at least one filler, wherein a total amount of the at least one filler and/or calcium sulfate hemihydrate is at least about 50 wt % of the joint compound on a dry (water-free) basis, preferably the filler comprises calcium carbonate, calcium sulfate dihydrate, or calcium sulfate anhydrite, or a mixture thereof; binder at up to about 15 wt % of the joint compound on a dry basis; polymer thickener at up to about 3 wt % of the joint compound on a dry basis; plasticizer dedusting agent at about 0.01 to about 3 wt % of the joint compound on a dry (water free) basis; and an additive up to about 10 wt % of the joint compound on a dry basis.

    Shaftwall system using folded panels, and panel
    9.
    发明授权
    Shaftwall system using folded panels, and panel 有权

    公开(公告)号：US10689846B2

    公开(公告)日：2020-06-23

    申请号：US15653283

    申请日：2017-07-18

    Applicant: UNITED STATES GYPSUM COMPANY

    Inventor： James M. Ullett ,  Naveen Punati

    IPC: E04B2/78 ,  E04F17/00 ,  E04B1/94 ,  E04B2/74

    Abstract: A panel for a shaftwall system includes a panel body with a core and at least one outer facing layer and an opposite backing surface. A score line is formed in the facing layer, defining two folded panel portions. The panel is folded along the score line to form a folded edge, and the folded panel portions are arranged so that the backing surfaces of the panel portions contact each other. A companion shaftwall building structure system is provided, including a plurality of the panels defining an enclosure, each panel being a ½-inch thick wallboard panel having a “V”-shaped score line defining a pair of panel portions, the score line forms a tapered edge of the folded panel. A plurality of brackets is provided, each bracket defining a panel track dimensioned for slidingly accommodating the folded panel and retaining the panel in place without the use of fasteners.

    One hour fire rated wooden frame members using lightweight gypsum wallboard
    10.
    发明授权
    One hour fire rated wooden frame members using lightweight gypsum wallboard 有权

    公开(公告)号：US10066392B2

    公开(公告)日：2018-09-04

    申请号：US15466612

    申请日：2017-03-22

    Applicant: UNITED STATES GYPSUM COMPANY

    Inventor： Gary Franklin Miller ,  Joseph Edward Swinea ,  Naveen Punati

    IPC: E04B9/04 ,  E04B1/26 ,  E04B1/76 ,  E04B1/94 ,  E04B9/00 ,  C04B28/14 ,  C04B20/06 ,  E04C3/16

    Abstract: A combined wooden frame support and ceiling system is provided, each support including upper and lower wooden chords and a wooden structure connecting the lower chord to the upper chord for weight bearing purposes. A gypsum wallboard batten strip is attached to the lower chord, and defining a ledge extending from each side of the lower chord. A single thickness of gypsum wallboard panels is used to create a ceiling attached to the support, each panel used to create the ceiling is made from a slurry composition including less than 5% by weight of Grade 4 vermiculite. Upon the support being assembled in the ceiling system, with a plurality of the supports, and having lengths of insulation supported by the ledges of the adjacent supports, the ceiling system resists charring by fire for at least one hour.

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