In a protective gas atmosphere, at least one metal of high vapor pressure (diffusion metal) is admitted as an alloying component through diffusion into the impregnating metal of lower melting point such as silver or copper contained in the pores of the frame metal, such as tungsten, rhenium or molybdenum. The diffusion temperature is chosen so that the impregnating metal exists in the liquid phase at least after the diffusion of the diffusion metals. The diffusion takes place, preferably, at 20 ...

A medicament carried within a perforate or semipermeable shell is gradually released, as by dissolution into body fluids, to provide effective therapy with reduced concentration and dosage. The medicament may be in dry powdered form. For treatment of the eye, the carrier comprises a capsule less than 1 millimeter in diameter which is placed in the conjunctival sac or mounted in a contact lens. The capsule may be colored for easy location and removal, may be absorbable by the body, or may gradual...

This disclosure relates to signal level control instruments for sound transmission systems comprising a signal top value measuring instrument for indicating a maximal reference volume for a high quality sound signal transmission in the system without exceeding a desired maximum distortion of the signal and, in particular, transient signals of short duration. The invention teaches the use in combination with a signal top value measuring instrument of a weighing network inserted between the top va...

A process for producing bulk alloys as engineering materials is carried out in a vacuum vessel and includes evaporating the constituents and depositing them upon a collector in such a way that the deposit is laid down in successive layers. This is achieved by arranging that the collector and the source or sources from which the constituents are evaporated move relative to one another. Preferably the source or sources are stationary and the collector is moved relative thereto. In this way it is p...

A method of making a coated abrasive article having an electrically conductive backing is taught, wherein electrically conductive material is incorporated into a coated abrasive backing. The coated abrasive article made by this method has a reduced tendency to accumulate static electric charge in the abrasive article during abrading of a workpiece.

A manufacturing method, for an abrasive tape used for the burnishing of items such as floppy disks, which significantly reduces resulting scratches. An abrasive tape is manufactured by the steps of applying a coating liquid which contains as a major composition abrasive particles and a binder resin to a flexible substrate; drying the flexible substrate to produce an abrasive layer; and subjecting the abrasive layer to a surface smoothing treatment in order to align the tip ends of the abrasive p...

In a method of forming a corrosion resistant coating on steel strip, the strip is coated on at least one side with a uniform distribution of a chromium-containing metal powder and a considerably less amount of an alkali or alkaline earth metal halide. The powder, containing the halide, is compacted on the strip. The strip is coiled, preferably in a tight coil, and heated in a heating zone in a protective atmosphere for sufficient time and at a temperature to cause diffusion between the metal str...

In a system with parallel connected compressors, a suction and discharge manifold arrangement for isolating an inactive compressor from the rest of the operating system. A check valve in the discharge line of the compressor prevents fluid flow back into the discharge port from a common system discharge line when the compressor is de-energized. A normally closed, pressure actuated valve in the suction line of each compressor prevents fluid from flowing through the compressor suction port when the...

An apparatus (2) for the impregnation of metal castings including an impregnation chamber (11) having an open end; a movable assembly (2) comprising a cover (20) for closing the open end of the impregnation chamber, a casting carrier (21), carrier transport means (22) for raising and lowering the casting carrier relative to the cover, and carrier rotating means (23); and transport means (24) for raising and lowering the movable assembly relative to the open end of the impregnation chamber. The i...

An improved method for preparing an abrasive SiO.sub.x coating wherein 1.ltoreq.x.ltoreq.2. The method includes the steps of submitting SiH.sub.4 and N.sub.2 O to glow discharge and depositing the SiO.sub.x product of the glow discharge onto a substrate. The improvement includes the additional step of adjusting the refractive index and thickness of the SiO.sub.x coating by means of the glow discharge deposition process parameters so as to maximize the abrasiveness of the SiO.sub.x coating.