Abstract: A process for creating a hot dry rock oven for the extraction of heat energy is disclosed wherein the geothermal fluid injection and withdrawal wells are brought into positive hydraulic communication during the creation of the hot dry rock oven. The oven complex is produced by fracturing the formation from a plurality of bore holes simultaneously.

Abstract: An inlet screen assembly having the filter screen tensioned in only one direction when mounted on a frame which prevents distortion of the filter screen openings and which may be used to filter extremely fine solids from the influent. The screen assembly provides a large flow capacity with a minimum pressure differential that may be used in any type intake facility and is suitable for use in either a stationary or movable screen water intake facility.

Abstract: A pulsation dampener for dampening undesired pressure surges in a fluid comprising a pressure vessel having a first zone for receiving a fluid under pressure, a second zone having a compressible fluid therein at a preselected pressure and a third zone in communication with the second zone having a compressible fluid therein at a preselected fluid pressure greater than the preselected fluid pressure of the second zone. The pulsation damper can be designed as a supplemental pressure vessel to be added to conventional dampeners. The pulsation dampener can include a magnet assembly valve.

Abstract: A fluid propelled ground effect vehicle lifted by pressurized fluid directed upwardly through openings in a support floor. The vehicle body is propelled across the support floor by exiting pressurized fluid trapped in a receiving chamber underneath the vehicle body and discharged through an outlet in the chamber. The vehicle body is steered by controlling the direction of exit of the pressurized fluid as it leaves the receiving chamber.

Abstract: Process and apparatus for the partial combustion of pulverized coal, in which the pulverized coal, dispersed in an inert carrier gas, is supplied to a burner, and oxygen is injected into the stream of pulverized coal at two longitudinally spaced locations in the burner for feeding into a gasification reactor.

Abstract: The present invention provides a slide rule for use by physicians, pharmacists and other medical or hospital personnel in determining and computing dosages to be administered by hyperalimentation. Total calories in the dosage, as well as final percent concentrations of base components and nutrient solutions in the dosage, may be determined.

Abstract: An implantable sea-floor shoring cellar is provided for housing drilling equipment such as a blowout preventer stack at least partly below the sea floor in order to allow oil well drilling by drill ships in shallow water areas where the distance between the sea floor and the drill ship is not sufficient to allow for normal positioning of the blowout preventer stack above the sea floor. The implantable sea-floor shoring cellar includes a substantially cylindrical retainer wall assembly with an annular air ejector assembly including ejector nozzles mounted within the retainer wall assembly adjacent to a lower opening; and a plurality of discharge tubes are mounted over the ejector nozzles for removing earth loosened from the sea floor during cutting of an opening below the retainer wall assembly so that the retainer wall assembly may be lowered without interference into place at least partly below the sea floor.

Abstract: A control valve assembly for controlling fluid flow in a flowline having a housing with a normally operative flow control structure and bypass structure therein for providing independent first and second flow paths for allowing controlled fluid passage through the housing from the flowline through the first and second flow paths, as desired.

Abstract: A new and improved pulsation dampener or surge absorber having an improved diaphragm or bladder is disclosed. The diaphragm is disposed within a pressure vessel for forming two non-communicating zones. The first zone communicates with the fluid having the undesired pulsations or surges while the second zone is precharged to a desired pressure level with a compressible fluid. The pressure vessel is secured with the conduit having the pulsating fluid and the diaphragm is disposed within the pressure vessel for preventing contact of the fluid having the pulsation with the pressure vessel to prevent corrosion of the pressure vessel. The inlet nozzle for the fluid having the pulsation which is subject to flow erosion as well as corrosion can thereby be replaced without replacing the pressure vessel securing means. The diaphragm is of the reverse folding type and is provided with shock absorber means on an inlet bridging disk to protect the diaphragm when the pulsating fluid pressure is reduced.

Abstract: A method for hydraulically fracturing a single subterranean formation in which a fracture is first induced in the formation and then subjected to multiple hydraulic fracturing cycles to generate vertical linear fractures or to linearly extend the fracture outward from the point of introduction of the fracing fluid into a well penetrating the formation. By utilizing fracing fluid containing a high ratio of fine proppant and injected at a low rate, the linear fracturing solely within the formation can be substantially increased with very little or no radial vertical fracturing occurring outside the formation.

Abstract: The method for removing a bearing assembly disposed between a revolving turntable of a pedestal crane assembly and the pedestal and a removable bearing assembly for a pedestal crane, wherein the method includes activating a support member coacting between the revolving turntable and the upper end of the pedestal for raising and supporting the pedestal crane assembly from the support column of the pedestal, centering the revolving turntable about the support column of the pedestal with alignment structure, removing a retainer plate that secures thrust and radial bearings in position with respect to the revolving turntable and the upper end of the pedestal to permit access and removal of the bearings.

Abstract: For use in helium or other gas reclamation, a diver gas safety valve adapted for attachment to a diver's helmet and to an exhaust gas recovery system, the safety valve including a collapsible tube for expanding to transfer exhaust gas having a pressure greater than ambient water pressure surrounding the diver and for collapsing to prevent such exhaust gas transfer at exhaust gas pressure below the ambient water pressure in order to prevent dangerous, sudden outflows of the exhaust gas from the diver's helmet.

Abstract: The operation of a television system or photographic camera in concert with line or boundary indicators or monitors at a sporting contest are controlled. When the indicator detects an event of interest during the contest being monitored, such as an intrusion or the presence of an object along a line or boundary, a signal is sent to a video replay recorder, also known as an instant replay system, to continue recording for a predetermined interval and thereafter cease.An indicator or mark is also transmitted into the recording system on occurrence of the event of interest and is recorded along with the continuing event until recording ceases. After recording ceases, operators of the television system may then play back the recorded event into the television system. During the play back, the recorded indicator is also transmitted into the television system to appear on television screens and indicate the time of occurrence of the event of interest.

Abstract: A method for the production of sponge metal by the gaseous reduction of metal oxides in iron ore to sponge iron, wherein metal oxided iron ore is initially preheated to or near reduction with a hot oxygen-free gas stream produced by the combustion of a fuel with no more than a stoichiometric amount of an oxygen-containing gas. The preheated ore is then reduced by contact with a hot reducing gas stream which has been preheated by intimate mixing with a hot oxygen-free heating gas stream. The hot oxygen-free gas stream is produced by the combustion of a fuel with no more than a stoichiometric amount of an oxygen-containing gas. The intimate mixing of the reducing gas and the oxygen-free heating gas rapidly raises the temperature of the reducing gas without depleting any reducing components thereof before the heated reducing gas is passed over the oxided iron ore.

Abstract: A new and improved rotating cyclone centrifuge apparatus having an accelerator (A) which receives a liquid feed having solid particles to be separated therefrom in an axial direction and discharges it radially outwardly in a helical flow through diametrically opposite chokes (40b) into a separation chamber (10c) whose diameter substantially coincides with the outer extremities of the chokes, whereby the fluid flow is first brought up to the velocity of the rotating apparatus and is further accelerated in excess of the velocity of the rotating apparatus as the fluid enters the separation chamber without plugging of entranceways or of the chokes by the solids in the liquid feed. The liquid feed is precisely separated into a heavy phase which has the heavier particles and a light phase which has the bulk of the liquid and lighter particles, both of which are discharged from the same end of the separation chamber, and opposite from the feed inlet end.

Abstract: A method and apparatus for preparing a hot reducing gas for introduction into a vessel containing ore oxide in order to react with the ore oxide to produce reduced metal including the steps of combusting a fuel with no more than a stoichiometric amount of air to produce a heating gas having an absence of available oxygen, mixing the heating gas with an initially preheated reducing gas stream in order to heat the initially preheated reducing gas stream without spending any of the reducing strength thereof and further to mixing such air and fuel to produce a heating gas which will cause the formation of additional reducing constituents.

Abstract: A bone screw is provided with screw threads which are like-handed but of different pitch on its respective leading and trailing ends. In the more favored embodiment, the pitch of the leading screw thread exceeds that of the trailing screw thread. Such a screw may be used to hold portions of a fractured bone in compressive engagement.

Abstract: A novel process is disclosed for the preparation of cyclopropanecarbonitriles of the general formula: ##STR1## wherein R.sub.1, R.sub.2 and Hal have the meanings given in the description; which comprises heating the corresponding ammonium or aminium cyclopropanecarboxylate in the presence of a polar aprotic solvent. The process produces cyclopropanecarbonitriles, in high yields, which are useful as intermediates in the production of insecticidally active compounds.

Abstract: A single line clamshell bucket apparatus having new and improved guided amatic latching means for effecting positive operation while raising, lowering and operating the bucket apparatus for picking up and dumping a load.

Abstract: A process for the preparation of an ester of cyanoacetic acid having the following general formula: ##STR1## (wherein R represents an aliphatic or cycloaliphatic hydrocarbyl group), which comprises contacting an alkali metal carboxylate of general formula: ##STR2## (wherein M represents an alkali metal atom) with a hydrocarbyl halide of general formula:R--Hal (III)(wherein R has the meaning hereinbefore defined and Hal is a halogen atom having an atomic number of at least 17) in the presence of a phase transfer catalyst and an organic solvent.