Abstract: A vent apparatus for cooperating with duct work associated with an exhaust fan to enable air to be exhausted from an interior room of a dwelling to the exterior environment. The vent apparatus includes a base member and a cover member releasably securable to the base member. The base member includes an attaching portion having a plurality of locking portions, while the cover member includes a plurality of flexible latching arm members which releasably engage the locking portions when the cover member is placed over the attaching portion. The attaching portion includes an enlarged opening which enables air exhausted from an interior room to be directed out between the base and cover members to the exterior atmosphere. The apparatus is particularly well-adapted to be used with vinyl or aluminum siding and is relatively inexpensive to construct, light-weight and easy to install. In an alternative embodiment, the apparatus includes a screen adapted to be secured to the base member.

Abstract: An improved process is provided for in situ mitigation of coke buildup and porous catalyst used for the processing of hydrocarbon feed stocks. The process exhibits improved catalyst activity over extended periods and the process comprises the pretreatment of hydrocarbon feed stocks to reduce impurities in the feed stocks in the form of peroxides and oxygen compounds that promote the formation of coke precursors, which precursors are typically in the form of olefinic oligomers. The process includes contacting the pretreated feed stream with a suitable catalyst under sub-critical, near-critical and supercritical conditions.

Abstract: A building vent assembly comprising a plurality of individually extruded plastic vent components that have been cut to a desirable length and pitch for a particular size and shape vent.

Abstract: For use in a decorative molding system comprising thin flexible plastic molding strips having clips thereon and flexible tracks engaged by the clips, a plastic corner member provided between the adjacent plastic molding strips and forming a corner for receiving a pair of the plastic molding strips having free ends with their longitudinal axis forming an angle at a corner of a room. The plastic corner member comprises a one piece plastic body having side walls intersecting at substantially the same angle as the angle formed by the edges of said ends of adjacent plastic molding strips. Each wall has substantially the same undulating cross sectional configuration as the adjacent plastic molding strips. Each wall has an upper free edge, a lower free edge and a vertical free edge, an outer surface and an inner surface. A flexible plastic clip is attached to each the wall. Each clip has first end and a second free end.

Abstract: A molding assembly having a hanger member fixedly securable to an inner or outer wall of a building and a decorative molding insert member releasably engageable with the hanger member. The molding insert member is supported at a lower edge portion by a lower J-channel of the hanger member. An upper L-shaped portion of the insert member is supported by a depending lip portion of the hanger member which forms a second channel such that no external fastening elements are required to secure the molding insert member to the hanger member. The insert member can be quickly and easily releasably engaged within the J-channel and the second channel without the need for special tools. In an alternative preferred embodiment the insert member includes a lip portion which is adapted to slidably engage an under surface of an adjacently positioned insert member to provide an even more continuous appearance for adjacently positioned insert members.

Abstract: A decorative molding system removably installed at a ceiling and a vertical wall. The molding system includes a thin molding strip of flexible plastic and a plurality of flexible plastic clips attached at spaced points along the back surface points of the molding strip. A wall track of flexible plastic is mounted adjacent the upper edge of the track on one of the ceiling and said vertical wall. Interengagement is provided on the free end of the clip and the track such that when the thin molding strip with the flexible plastic clips attached thereto is mounted on the track by relative movement, the free end of the clip is moved into the gap and the forward leading edge of the track is engaged. At the juncture of adjacent molding strips, one of the molding strips is provided with a complementary shaped plastic segment spaced from the internal surface of the molding strip to provide a cavity.

Abstract: An octagonal plastic window assembly is provided for mounting to an exterior surface of the building wall or doer. The window includes two spaced window panes, one of which is glass and the other plastic. An exterior trim ring is provided to circumscribe the window to give a finished appearance to the exterior of the window. An octagonal liner assembly is provided comprising a plurality of interconnected liner panels connected together by a snap fit and received within a rough opening in a building wall or door. An interior trim ring is provided for attachment to the liner assembly to give a finished appearance to the interior side of the building wall or door. The plastic window assembly can be installed without the use of fasteners.

Abstract: The plastic foundation vent embodying the invention comprises a plastic body with an integral peripheral rectangular wall surrounding the plastic body and defining opposed long sides and opposed short sides, an integral peripheral flange extends outwardly from the peripheral wall. A central integral screen portion having openings for bending and prevention of entry of animals and the like is provided within the peripheral wall. The peripheral flange has a front surface and a rear surface. A first groove is provided on the rear surface of one of the flanges alongside to define a live hinge line permitting the flange to be bent backwardly and forwardly.