Abstract: The present invention provides a process for the preparation of threo-methylphenidate hydrochloride. According to a preferred embodiment, the process comprises the following steps: (a) contacting 1-(phenylglyoxylyl)piperidine arenesulfonylhydrazone of the formula wherein Ar denotes an aryl group, where the aryl group may be substituted by a C1–C6 alkyl, halo or nitro group; with an inorganic base in the presence of a water immiscible organic solvent and a phase transfer catalyst to obtain (R*,R*)-enriched 7-phenyl-1-azabicyclo [4.2.0]octan-8-one of the formula: (b) reacting the (R*,R*)-enriched 7-phenyl-1-azabicyclo[4.2.0]octan-8-one prepared in step (a) with a solution of hydrogen chloride in methanol to obtain threo-enriched methylphenidate hydrochloride; (c) crystallizing the threo-enriched methylphenidate hydrochloride prepared in step (b) to give the desired threo-methylphenidate hydrochloride.

Abstract: Laminated hip and ridge asphalt shingle having a first, a second and a third layer laminated together by a lamination adhesive. The first layer is of two L-shaped configurations, each having a horizontal head portion and a vertical butt portion. The horizontal head portions are superimposed on each other, while the vertical butt portions are placed adjacent to each other and form a gap which allows bending of the first layer thereby preventing stress and breaking. The second layer overlaps the firs layer. The third layer only overlaps the head portion of the second layer. The top surface of the shingle is coated with mineral granules, while portions of the undersurface of the shingle are coated with a self-seal adhesive to secure the shingle to the hip or ridge of a roof.

Abstract: A nail gun and depth control spacer assembly for ejecting nails into a substrate which contains two or more layers of roofing materials one of which is a compressible fibrous layer. The nails penetrate the substrate but are prevented by the depth control spacer from permanently compressing the compressible fibrous layer which springs back to is original thickness after completion of the nailing process. The depth control spacer, attached to the base of the nail gun, is of semi-oval configuration having a pressure sensitive layer and a solid layer, is provided with an oval cavity in its center portion through which the nails are ejected into the substrate.

Abstract: Two-piece fastener assembly for securing thermoplastic roof membranes to an underlying roof deck having: a batten bar coated with a thermoplastic coating on its top surface; a plurality of openings in the batten bar; and fasteners positioned in the plurality of openings for securing the batten bar and one thermoplastic roof membrane to the underlying roof deck.

Abstract: Method for producing a galvanized steel drain pan of rectangular or square configuration for use in refrigerators, freezers, and air conditioners to collect condensate water, the method includes the steps of: cutting a blank galvanized steel plate to the desired size; folding sides portions of the blank to a degree of 60 to 90 to form side portions of the drain pan; corrugating the corners formed by the side portions; and installing a drain fitting along with a pipe to drain the condensate water from the drain pan. Also disclosed is the drain pan made by the method.