Abstract: A housing for an electrostatic air cleaner is made adaptable to various sizes of cells by use of the same components. Top and bottom wall members are interconnected by telescoping corner members which can be contracted or expanded to vary the height of the housing as desired. The ends of the housing are closed by way of doors which are also expandable to varying lengths so as to accommodate various housing heights.

Abstract: A valve for use in an air distribution system has an inlet member for the axial flow of air therethrough along a central axis. A downstream portion of the inlet tapers outwardly in the downstream direction. Support structure is presented from which an extension projects downstream along the axis of the inlet. A damper for controlling air flow through the inlet defines an aperture penetrated by the support structure extension and a second aperture radially displaced from the first aperture. A motor is attached to the damper and is directly coupled to the support structure extension. The motor selectively positions the damper along the support structure extension between a downstream open position and an upstream closed position.

Abstract: Polycarbonate prepolymers are produced by adding phosgene, one or more dihydric phenols, a halogenated organic solvent, and an aqueous caustic solution together with mixing in motionless mixers to form fine dispersions of partially phosgenated phenols, allowing for interfacial reactions to occur in residence time sections and repeating the steps after the addition of caustic to form high molecular weight prepolymers. These prepolymers are then polymerized with amines to form high molecular weight polycarbonates.

Abstract: Additive modified blends of thermoplastic resins are prepared by combining rubber modified polycarbonate or aromatic polyester carbonate containing concentrate resin with a let-down resin and/or regrind resin.

Abstract: Polycarbonate prepolymers are produced by adding phosgene, one or more dihydric phenols, a halogenated organic solvent, and an aqueous caustic solution together with mixing in motionless mixers to form fine dispersions of partially phosgenated phenols, allowing for interfacial reactions to occur in residence time sections and repeating the steps after the addition of caustic to form high molecular weight prepolymers. These prepolymers are then polymerized with amines to form high molecular weight polycarbonates.

Abstract: A skateboard ski apparatus wherein a skateboard platform and related skate trucks are combined with removable ski shoes, the ski shoe having a substantially flat body member provided on its lower surface with parallel runners, and on its upper surface with support ribs adapted to either receive wheels of an existing skateboard or the axles of the wheel-truck assembly. The forward end of the preferred arrangement of the ski shoe includes an upwardly turned end to allow the apparatus to slide over the snow. A second arrangement includes a ski shoe having both ends adapted with upturned ends so that the skateboard ski can be used in either a backward or forward direction.