Abstract: The present invention relates to the compounds of formula (I), ##STR1## wherein R.sup.1 is C.sub.1-8 alkyl; C.sub.5-8 cycloalkyl;--(CH.sub.2).sub.n --Si(CH.sub.3).sub.3, wherein n is 1 to 5; C.sub.2-5 alkylenyl; arylmethylene; aryl; heteroaryl; or wherein such aryl or heteoaryl bears 1 to 3 substituents independently selected from halogen, amino, C.sub.1-8 alkyl mono- or disubstituted amino, C.sub.1-8 alkyl and C.sub.1-8 alkoxy and R.sup.2 is C.sub.1-8 alkoxy, pharmaceutical formulations containing these compounds and their use as vasodilators and in the treatment of cardiovascular disorders.

Abstract: A melting casting process produces meltable metal cores for subsequent molding of components made of plastic material and encapsulated components such as turbine blades so they may be held for machining. The process utilizes a double acting piston in a cylinder to permit unlimited dispensing capacity without having to pause between piston strokes. The apparatus comprises a tank for containing molten metal, a double acting cylinder having both ends closed and an injection piston therein and an operating mechanism for reciprocating the piston in the cylinder. Valve mechanisms are provided so that when the piston is moved in either direction in the cylinder, a flow of molten metal passes through an injection passageway into a die, and molten metal from the tank fills the space behind the moving piston thus the cylinder always remains full of molten metal.

Abstract: In the casting of metal alloys with low melting temperatures, an improved control system for lowering an injection piston in an injection cylinder is provided to avoid porosity occurring in castings. There is a fluid operated drive cylinder with a drive piston connected to the injection piston. A transducer is linked to the injection piston to provide an indication of location, and a controller compares the position of the injection piston with a predetermined time/distance profile and produces an injection stroke signal which is used to control the drive cylinder and ensure the injection piston follows the time/distance profile.

Abstract: In the casting of metal alloys with low melting temperatures, there is provided a nozzle for an interface connection between a transfer line and a die which permits misalignment and a variable height differential. Meal alloys with low melting temperatures are made for cores in subsequently molded plastic components and for encapsulating components for machining the other finishing steps. The nozzle has a base with a valve therein, a nozzle body adapted to move relative to the base to open the valve, and a spring to hold the valve closed. A sleeve joins the nozzle body and the base, and a connector on the nozzle body provides an interface connection between the transfer line and the die so that when the connector interfaces with the die, the valve is open.

Abstract: An improved valve mechanism for casting metal alloys with low melting temperatures provides two valves in a single assembly inside an alloy tank. The valves being in the tank reduces the formation of oxides which can occur in air and tends to reduce leaks. The apparatus comprises a tank adapted to contain molten metal alloys, a cylinder in the tank having at its base a connection to an injection passageway which leads through the tank to a die located outside the tank. A piston reciprocates in the tank which allows molten metal alloy to be drawn into the cylinder and forced through the passageway to the die. A control system for the piston controls accurately the speed of the piston in the cylinder when the molten metal alloy is fed to the die.

Abstract: A portable air compressor unit includes a sound attenuating enclosure formed to have a first compartment through which cooling air flows before passing through side-by-side mounted heat exchangers for engine coolant and compressor injection liquid. Engine and compressor inlet air filters are disposed in the first compartment. An engine driven fan draws cooling air from the first compartment into a second compartment containing the engine and compressor. An engine inlet air silencer and exhaust gas muffler are also disposed in the second compartment. Heated cooling air is discharged from the second compartment into three side-by-side ducts at the end of the enclosure opposite the first compartment. Exhaust openings in the end and side walls of the enclosure provide for final exit of the cooling air from the enclosure above the level at which cooling air enters the first compartment.