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| Number | Title | Issue Date |
| 5787880 | Resuscitation device 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 wal... | 08/04/1998 |
| 4741743 | Grinding wheel with combination of fused and sintered abrasive grits 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.... | 05/03/1988 |
| 4735927 | Catalyst for the reduction of oxides of nitrogen 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, prom... | 04/05/1988 |
| 4735930 | Catalyst for the reduction of oxides of nitrogen 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 ... | 04/05/1988 |
| 4728043 | Mechanical sorting system for crude silicon carbide 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 sai... | 03/01/1988 |
| 4711750 | Abrasive casting process 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 f... | 12/08/1987 |
| 4708856 | Liquid-gas absorption process A process for absorbing SO2 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 ... | 11/24/1987 |
| 4668645 | Sintered low density gas and oil well proppants from a low cost unblended clay material of selected composition 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% alk... | 05/26/1987 |
| 4657754 | Aluminum oxide powders and process 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... | 04/14/1987 |
| 4641289 | Process and device for transmitting information over a distance 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 ... | 02/03/1987 |
| 4639427 | Stress-corrosion resistant proppant for oil and gas wells 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.... | 01/27/1987 |
| 4635738 | Drill bit 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 axi... | 01/13/1987 |
| 4634453 | Ceramic bonded grinding wheel 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 wid... | 01/06/1987 |
| 4623364 | Abrasive material and method for preparing the same 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 ... | 11/18/1986 |
| 4577704 | Bearing system for a downhole motor 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 pip... | 03/25/1986 |
| 4565792 | Partially stabilized zirconia bodies 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.... | 01/21/1986 |
| 4543107 | Vitrified bonded grinding wheels containing sintered gel aluminous abrasive grits 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 ... | 09/24/1985 |
| 4541842 | Glass bonded abrasive agglomerates 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 t... | 09/17/1985 |
| 4523930 | Method of manufacturing composite grinding wheel 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... | 06/18/1985 |
| 4499563 | Apparatus for transmitting data from a borehole to the surface of the earth during the operation of a drilling device An apparatus for the remote transmission of information from a borehole (1) to the surface of the earth is disposed in a drilling pipe string (4) of a drilling device. The drilling device further comprises a rotary drill bit (3) and a pump (5) which pumps... | 02/12/1985 |
| 4471845 | Rotary drill bit Cutting elements, for example of polycrystalline sintered diamond, the cutting faces of which are set differently to the cutting direction, are disposed on a rotary drill bit. One group of cutting elements has its cutting faces substantially perpendicular... | 09/18/1984 |
| 4468762 | Telemetry equipment in modules A device for the remote control of data out of a drill hole to the earth surface during the operation of a drilling device which comprises a drill bit, a drill string and a pump raising a flushing liquid into the surrounding annular space of the drill hol... | 08/28/1984 |
| 4460053 | Drill tool for deep wells A rotary bit for oil and gas well drilling has cutting elements set in a hard facing material which in turn is supported by a sintered steel section between the hard facing and the steel base of the bit.... | 07/17/1984 |
| 4457767 | Alumina-zirconia abrasive Abrasive properties of co-fused alumina zirconia are improved by the addition of from 0.1 to 2% of Y2 O3 to the fusion mix and quenching the fused product. Y2 O3 ores containing mostly Y2 O3 | 07/03/1984 |
| 4452322 | Drilling device for drilling a core in deep drill holes In a core drilling apparatus wherein a core bit is driven by a hydraulically actuated Moineau type motor, control valve means are provided whereby drilling fluid can be directed through the core sleeve to remove debris from its interior, and, subsequently... | 06/05/1984 |
| 4452324 | Rotary drill bit A rotary drill bit, particularly for deep-well drilling, comprising a body (1) having a gauge region, a cutting surface which is defined by projecting cutting members (4) supported at the outer periphery of the body on supporting members and nozzle passag... | 06/05/1984 |
| 4440246 | Cutting member for rotary drill bits A cutting member for rotary drill bits consists of a carrier member with a supporting face which consists of two component supporting faces adjoining one another in wedge-shape forming a front edge, and applied to each of the two component supporting face... | 04/03/1984 |
| 4419336 | Silicon carbide production and furnace An improved acheson furnace structure is shown having insulated gate means for increasing the volume of coarsely crystalline silicon carbide produced in each cycle of the furnace together with a reduction in the volume of fire sand required to be recycled... | 12/06/1983 |
| 4415823 | Generator for the production of electrical energy Generator for production of electrical energy to supply consumers located inside a bore hole, in particular, consumers for detection, transmission and remote control, where the generator is located in a flushing space inside of a drill string through whic... | 11/15/1983 |
| 4415316 | Down hole motor In a Moineau type fluid motor one of the relatively rotatable elements is made of a deformable material, and axial movement of tapered surfaces within the element, caused by variation in the fluid pressure, causes adjustment of the sealing force in the mo... | 11/15/1983 |
| 4410453 | Ethylene oxide catalyst The performance of a silver on alumina catalyst for the oxidation of ethylene to ethylene oxide is improved by the inclusion, in the raw mix for the carrier of an oxide, or oxide precursor, of zinc, lanthanum, or magnesium in the amount of 7 to 40%, calcu... | 10/18/1983 |
| 4381227 | Process for the manufacture of abrasive-coated tools Abrasive products comprising abrasive grit particles bonded to a preferably flexible backing with nickel are produced by current assisted deposition from an electroless plating bath. The current is applied between a nickel containing anode and the abrasiv... | 04/26/1983 |
| 4378233 | Metal bonded grinding wheel containing diamond or CBN abrasive An improved grinding wheel employing premium abrasive (diamond or cubic boron carbide) is made by employing a metal bond made from aluminum, zinc, copper, and tin, and including up to 50% of a dry film lubricant filler. The abrasive elements produced are ... | 03/29/1983 |
| 4373593 | Drill bit A rotary boring bit for boreholes comprises a body provided on its outer periphery with cutting members (6) consisting of a cutting portion (8) and a supporting portion (7), each cutting member being formed as a segment of a sintered body (1) having a cor... | 02/15/1983 |
| 4361194 | Bearing system for a downhole motor 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 pip... | 11/30/1982 |
| 4342121 | Hot mill glove This disclosure is of a lined work glove which is manufactured utilizing adhesives or heat sealing techniques to eliminate sewing. This type of glove can be used in applications where hot mill gloves or terry cloth gloves are currently being used for hand... | 08/03/1982 |
| 4337750 | Abrasion resistant diamond blade A saw blade having diamond or other abrasive segments bonded to the periphery of a steel center includes segments of a hook shape with a leg extending radially of the saw. Hooks of different length are provided whereby erosion of the blade at the joints b... | 07/06/1982 |
| 4336850 | Internal fluid screen to prevent nozzle and port plugging A strainer is shown for use with a downhole tool through which drilling fluid is circulated during the drilling of deep oil wells and the like. The strainer provides a plurality of narrow slots which prevent the passage of material therethrough that might... | 06/29/1982 |
| 4334895 | Glass bonded abrasive tool containing metal clad graphite Glass bonded grinding wheels including graphite or other inert dry film lubricant filler can be made by conventional techniques if the filler material is protected from oxidation by a metal cladding. Diamond or cubic boron nitride wheels are particularly ... | 06/15/1982 |
| 4321998 | Earplug container A combined protective case and inserter for earplugs has a cover held in a closed or an open position by a frictional backing feature, and can be reversed whereby either one of two earplug inserting means are exposed externally for the case for aiding the... | 03/30/1982 |
