Abstract: A resuscitation device including an air delivery device which has two rigid walls moveable toward and away from each other, is substantially rectangular, but may have rounded corners; a scissor type mechanism is employed to maintain parallelism of the walls; optional adjustment means is provided to adjust the delivered volume from at least 1200 ml, for an adult patient to a lesser amount for children and a still lesser amount for infants; the adjustment device may be coordinated with mens for simultaneously adjusting the maximum delivered pressure to levels appropriate to the adult, child, or infant patient; economy in storage and quantity of devices required is achieved.

Abstract: A combination of fused alumina grits with sintered gel alumina abrasive grits is shown to be more effective than either abrasive alone in cutting steel bars with bonded abrasive wheels at intermediate cutting speeds.

Abstract: A catalyst for the selective reduction of nitrogen oxides to nitrogen in the presence of ammonia in the form of composite bodies formed from a mixture of anatase (5 to 40% by weight), a zeolite (50 to 90%), a bond material (0 to 30%, and, optionally, promoter selected from oxides of vanadium, molybdenum, and copper, in the amount of at least 0.1% by weight.

Abstract: A catalyst for the selective reduction of nitrogen oxides to nitrogen in the presence of ammonia in the form of composite bodies formed from a mixture of zirconia (5 to 50% by weight), a zeolite (50 to 90%), a bond material (0 to 30%), and, optionally, a promoter selected from oxides of vanadium and copper in the amount of at least 0.1% by weight.

Abstract: A process for purifying crude silicon carbide lumps from an Acheson furnace comprising agitating the lumps in a drum having a cylindrical wall, its axis substantially horizontal and having openings of controlled size, smaller than said crude lumps, in said cylindrical wall, separating the particles passing through said controlled size openings according to size and recirculating oversize particles back to said rotating drum and finally recovering product retained in said drum.

Abstract: A continuous process for casting a molten metal oxide such as an aluminous oxide and more particularly an alumina-zirconia eutectic composition that is subsequently crushed to produce an abrasive is provided wherein two thin metal belts are brought into face-to-face relation and the molten oxide is poured into the nip between the belts as they come into face-to-face relation. The material that is being solidified maintains the belts slightly spaced apart on the order of some small fraction of an inch (e.g. 1/16) and the back surface of the belt is flooded with copious quantities of cooling fluid (e.g. water) to maintain the belts below red heat. The belts are held in closely spaced relation for a sufficient time to permit the abrasive to be cooled below red heat. The belts are then separated and the abrasive is discharged from between the belts.

Abstract: A process for absorbing SO.sub.2 from a gas in a packed column employs a low aqueous sulfite feed rate of 0.05 to 1 gallon per minute per square foot of tower cross section, or preferably 0.1 to 0.3 gallons per minute per square foot. Lower capital costs and lower operating costs result because of less tower equipment, lower pressure drop, reduced oxidation to sulfate, and elimination of pump around as compared to the conventional processes. Also disclosed is an improved liquid distributor.

Abstract: A solid granular propping agent is disclosed having a Krumbein number of greater than 0.8, and containing granules between 0.2 and 1.7 mm in diameter, said granules being made from an unblended clay containing from 16 to 19% of silica, less than 0.35% alkali and alkaline earth metal oxides, and being fired at a time and temperature whereby the product contains a major mullite phase and a minor alpha alumina phase.

Abstract: Fine alumina powders for making alumina bodies are produced by seeding of a non-alpha alumina with submicron alpha alumina particles, firing, and crushing and milling the fired product to a fine powder. The powder so produced may be formed by conventional techniques such as pressing, granulating, slip casting, tape casting, and extrusion, and sintered to produce the desired fired product.

Abstract: A downhole telemetry system for transmitting signals from a subterranean region in a well to the surface of the earth while drilling employs changes in the mud pressure encoded in digital form. The changes in mud pressure are accomplished by two balanced valves, one of which increases pressure by control of flow within the drill string, the other of which controls flow from the drill string to the annular between the drill string and the well.

Abstract: Aluminous proppant media in the form of sintered bauxite spheres containing silica are improved in resistance to stress corrosion by inclusion of zirconia in the mix prior to firing in the amount of a silica to zirconia ratio of from 6/1 to 20/1.

Abstract: A drill bit for drilling bore holes in underground formations comprising a bit body with a connecting spigot for connecting to a drill string or the like, and a cutting head which comprises a circumferential face extending parallel to its longitudinal axis and an end face having a drilling axis which is aligned with the axis of the connecting spigot. The drilling axis is parallel to and is offset relative to the axis of the cutting head. It is preferred that the end face is, at least in part, conical in shape.

Abstract: A method for making grinding wheels having an annular grinding section mounted on a central hub in which a slurry of abrasive particles and ceramic bond is coated on a pre-formed core, shaped, and fired. Method has particular advantage in formation of wide wheels and contoured wheels. Premium abrasive may be employed in the wheels.

Abstract: The hardness and microstructure of aluminous abrasives produced from alumina gels are enhanced by introduction of seed material as by wet vibratory milling of the material with alumina media, or by the direct addition of very fine alpha alumina particles in the amount of 1% or less.

Abstract: An improved bearing system for the driven shaft of a downhole motor is shown that provides a main thrust and radial bearing system having means for sealing the bearings in oil at equal or slight pressure above that of the drilling mud inside the drill pipe and insulating the fluid seals and bearings from all possibility of contact with cuttings and debris from the drilling operation. A durable seal having a restricted flow path permitting slow leakage is positioned below the main bearing system in such a relationship to the drilling fluid distribution path that the seals for the oil bath for the bearings are subjected to essentially the same pressure on all sides.

Abstract: Stabilized sintered zirconia bodies are made by employing zirconia powders made from rapidly quenched co-fusions of zirconia with a stabilizing metal oxide. Finer crystallinity and higher strength is achieved in the fired body.

Abstract: Bonding of sintered sol-gel aluminous abrasive grits, comprising sub-micron sized alpha alumina crystals, in vitrified (ceramic) wheels results in abrasive performance superior to premium grade fused alumina in grinding tool-steels. Viscosity of the bond and/or temperature of firing must be controlled to avoid reaction between the bond and the abrasive.

Abstract: Particles of agglomerates of abrasive particles held in a porous glassy matrix are produced by mixing abrasive grits with known porous-glass forming compositions. In the resulting product the abrasive grits are held encapsulated within the thin walls of the porous body and tend to concentrate at the periphery of the body.

Abstract: A composite grinding wheel comprising a support center with a peripheral groove containing a ring of metal bonded abrasive bonded thereto is made by placing in the bottom of an annular mold cavity, a ring whose internal bore is larger than and spaced from the inner smaller diameter of the mold cavity. The mold cavity above the ring is then filled with a sufficient volume of a mixture of metal bond and abrasive particles and closed off by an annular support center supported by the mold and having a central hub portion of smaller diameter than the internal bore in the ring and an axial height extending upwardly to an upper outer flange extending radially over the top of the mold cavity. The support center and ring are pressed together thereby compacting the mixture of metal bond and abrasive particles together between the upper outer flange and ring until the central hub extends into the ring and is substantially aligned with the bottom of the mold cavity and side of the ring.

Abstract: Inexpensive hydrates of alumina are used for the production of dense, submicron alumina bodies by conversion of the alumina hydrates to a soluble form which is then used to produce a boehmite gel. The boehmite gel, with very small particles of alpha alumina intimately dispersed therein is dried and fired to 1300.degree. C. to 1450.degree. C.