Abstract: A hanger is disclosed for supporting sound absorption panels wherein the panels have a top frame member with a depending lip portion. The hanger has a horizontal portion and a vertically downwardly depending portion, with the vertically downwardly depending portion having an upwardly and inwardly formed portion which can engage the depending lip of the frame of the panel to support the panel while the horizontal portion of the hanger is attached to supporting means. The formed portions can be useful in holding together abutting panels.A horizontally movable sound absorption wall is disclosed having one or more sound absorption panels supported by a top frame member, a hanger attached to the top frame member, and a track and guiding means for guiding the hanger along the track.

Abstract: A paper covered gypsum board and a process for its manufacture, with at least one cover of the board comprising a multiply paper sheet containing a major proportion of cellulosic fibers and a minor proportion of short mineral fibers.

Abstract: This invention relates to boardlike, load bearing, construction units formed from a tensile portion substantially uniformly distributed over the entire area thereof and which also has fastener holding properties and a cementitious material of good compressional strength forming substantially the remaining portion of the unit with novel means for effecting a bond between the tensile and compressional portions along with means for manufacturing the units and their use in various systems of construction.

Abstract: A sulfur fortified gypsum granule is provided, preferably adapted for agricultural uses so as to give a timed release of sulfate nutrients in soil comprising a combination of at least about 5 percent by weight of elemental sulfur and a major proportion of calcium sulfate which combination has been roll pressure compacted at a mixture temperature of about 110.degree.-230.degree. F to form hard granular shapes.

Abstract: Phosphate values of high purity and concentration may be efficiently recovered from a wide range of phosphatic-mineral-containing materials including as-mined phosphate ore by leaching such ore with a dilute aqueous mixture of sulfuric and hydrochloric or nitric acid, and precipitating phosphate values as dicalcium phosphate. This product, which is already suitable for use in animal feed and agricultural fertilizer, can also be readily converted to the many other agricultural and industrial phosphate products without costly purification operations or means of control of pollution to the surrounding environment.

Abstract: Fire-resisting doors having a novel framing, that is the stiles and rails of the door, are disclosed. The door comprises preferably a thermal insulating core and conventional outer facing cover sheets and is framed with a particular combination of glass fibers and gypsum in a particular arrangement.

Abstract: A dried gypsum board article and a gypsum board to be dried, the latter comprising a wet gypsum core and a cover sheet to be securely laminated thereto in drying and a coating composition, the cover sheet having a porosity between about 90 and about 260 as determined by ASTM D 726-58; the coating composition comprising a pigment binder and expanded inorganic particles present in an amount sufficient to provide the coated cover sheet with a porosity of no higher number than about 2500 seconds as determined by ASTM D 726-58. Thereby the wet core, paper and coating composition are capable of being simultaneously dried without delaminating the sheet from the core.

Abstract: A clip is disclosed for insertion into a C-shaped header for use in stiffening the header and concurrently attaching the stiffened header to an I-beam or the like. The clip includes a portion for insertion into the channel of the C-shaped header, said portion substantially filling a cross-section of the channel and contacting a substantial portion of the interior walls thereof, and one wall of the clip having integrally depending from one end thereof at least one leg or clip for engaging the I-beam and attaching thereto.

Abstract: A compact nestable air filter of generally rectangular form comprising a frame formed of an integral suitable cut and scored blank of paperboard, which, when assembled, comprises planar frame members engaging a substantially sheet-form filter element therebetween, and having flared frame members disposed at an angle of less than 180.degree. permitting a plurality of frames to nest within each other, thereby reducing the bulk of the plurality of filters. The portions of the flared frame members may be connected together by several means, including glue flaps hingedly connected to one frame member and adhesively affixed to an adjacent member. In an improved embodiment a portion of the planar frame members on the bottom or downstream side of the filter is provided with an integral perforated cover sheet for retaining the filter element in place when subjected to an air current.

Abstract: An extra-wide ceiling panel and ceiling constructed therefrom characterized by a reinforcing member extending along the back surface thereof, the member being generally flat with negligible vertical extension so as not to interfere with the stacking of such panels. Means are provided for further reinforcing the member with a beam characterized by extending generally perpendicular to the reinforcing member.

Abstract: A smoke stop for doors is disclosed. The smoke stop comprises a metal frame with a slot therein extending substantially the entire length of the frame on the door side thereof; a movable lid pivotally attached along one outer edge of the metal frame and releasably attached to a second outer edge of the metal frame thereby completely enclosing the slot in the metal frame; and an intumescent material completely enclosed within the enclosed slot. When the door is closed and the frame and door are subjected to flames, the intumescent material expands causing the sealing of the space between the frame and the door and thereby providing a smoke stop between the door and the frame.

Abstract: The invention relates to the manufacture of cementitious board, such as gypsum board, faced with paper or other sheets and having an improved accuracy of edge profile. A sheet to be folded at the lateral edges of the board is scored, and quick-setting adhesive, preferably a hot melt adhesive, is applied along the lines of folding. The sheet is then folded to the desired configuration and held until the adhesive has set thus establishing an accurate profile that withstands the action of the aqueous slurry of cementitious material and the application of the other sheet. The invention can be applied to various profiles, including square edge, tapered edge, rebated and tongue-and-groove.

Abstract: A corner construction is provided which utilizes a support having an elongated metallic flange, a back-up clip resiliently engaging the flange, and a pair of panels. One panel has a surface thereof engaging a first portion of the clip and is secured to the flange. The second panel has a surface thereof engaging a second portion of the clip and is secured thereto. An edge of the second panel is in abutting engagement with the first portion of the clip. The clip is concealed by the first and second panels which are arranged in angular relation.

Abstract: Porous gypsum granules are produced by adding powdered plaster to a stable aqueous foam and agitating the foam until granules of desired size are formed. Agitation is terminated before the foam collapses, but when the foam has subsequently collapsed the damp granules are recovered and dried. The product granules have a generally spheroidal shape mainly in the size range 0.25 to 2 mm, with a fine compact outer surface layer and a coarser interior with voids which confer high absorbency. These can be used as carriers for active materials such as herbicides or insecticides for agricultural or horticultural purposes or as fillers for plastics. Apparatus for continuously mixing fluid materials and suitable for use with foam and gypsum consists of a trough-shaped conveyor with a series of rotary agitators spaced along it.

Abstract: The invention relates to an improved accelerator for gypsum board manufacture, the accelerator containing a ground mixture of gypsum and a long chain fatty carboxylic acid, e.g. stearic acid, or a salt thereof, to the manufacture of the accelerator, and to its use in gypsum board production. The accelerator is less liable to deterioration on storage than conventional gypsum accelerators, and its use yields gypsum board of improved properties.

Abstract: Hardboard and other wood articles are made fire resistant by immersing the wood in a molten ammonium phosphate salt batn, preferably monoammonium phosphate.

Abstract: The load cell disclosed is for detecting changes in tensile loading of a multiwire structural post-tensioning tendon for a concrete structure. The load cell has a pair of spaced end plates, an elastically deformable cylindrical steel member which extends between and is connected to the peripheral portions of the end plates, and a telemetric strain sensing device mounted between the end plates centrally within the cylinder. The cylindrical steel member carries the full load of the post-tensioning tendon, and because of the central location of the strain sensing device within the cylinder member, measurements will not be affected by eccentricity.