Abstract: A foam container with an upper portion and a lower portion is provided. Upper lips formed by edges of upper walls of the upper portion distal from the top of the upper portion extend outward from the upper walls, while lower lips formed by edges of lower walls of the lower portion distal from the bottom surface extend outward from the upper walls. A groove is defined by the upper lips, and a rim is disposed at least partially along the lower lips. A peripheral indented segment in the lower walls and a peripheral ridge formed by the upper walls are dimensioned so as to render the container securably stackable with other containers. Arcs may be formed on the lower walls and the upper walls. The arcs may be centered on the walls with the walls having a thicker cross-section within at least a portion of the arcs.

Abstract: A discrete polyolefin catalyst activator is disclosed. A salient feature of invention borate-based activators is that at least one of the ligands on the borate non-coordinating anion (NCA) comprises a fluorinated aryl group linked to the boron atom through an acetylenic group appropriate pairing of invention activators with olefin polymerization. Catalyst precursors yield increased catalytic activity. Polymerization results are disclosed.

Abstract: An activator for olefin polymerization catalysts is disclosed. One aspect of the activator is that it comprises a group-13 central atom connected to at least one fluorinated aryl ring that is itself substituted with a silyl acetylenic group. Some embodiments employ a neutral activator and others employ the activator as an anion coupled with a ligand-abstracting cation. These activators are discrete molecules.

Abstract: A vacuum actuated power take off assembly for a winch which is preferably mounted on a vehicle and part of a tow truck structure of the type commonly known. A power shaft is connected in cooperative relation to the transmission vehicle and an activating means is operated through manipulation of a fluid operable switch which directs the negative pressure from the internal combustion engine to a fluid power drive structure which serves to dispose a connecting gear between the drive shaft and a power take off of the transmission into and out of operative position relative to drivingly attaching the drive shaft to the transmission for operation of the winch.