Abstract: An improved process for cryogenically separating a helium-bearing natural gas stream comprising subjecting the natural gas stream to a sequence of alternating cooling and separating steps wherein one or more process-derived streams are utilized to effect cooling of the natural gas streams to temperatures in the cryogenic range. The process provides for the separation and recovery of a natural gas liquids product stream consisting substantially of condensed C.sub.2 and higher hydrocarbons and a gaseous product stream consisting of at least 50 volume percent of helium with the balance being substantially nitrogen.

Abstract: A process is provided for preparing concentrated aqueous solutions of byproduct nitrate compounds from dilute aqueous streams containing said byproduct nitrate compounds, calcium ions and anionic species capable of reaction therewith at elevated temperatures. The process provides for the removal of the calcium ions by the addition of a source of carbonate ions to said stream to form solid, particulated calcium carbonate therein, the separation of the solid particulate from the stream, the neutralization of the stream and concentration of the stream to provide a concentrated aqueous solution containing the byproduct nitrate compound.

Abstract: There are provided titanium dioxide pigments characterized by improved gloss developing and dispersibility properties in surface coating vehicles and reduced tendencies to adsorb moisture. Said titanium dioxide pigments comprise pigmentary titanium dioxide particles having deposited thereon a treating agent comprising at least one amine salt of a polyprotic acid having pK.sub.a1 value greater than about 2.5 and a water solubility at 20.degree. C. of at least 2.0 weight percent and an alkanolamine having a pK.sub.b1 greater than about 4.4.

Abstract: A method for substantially removing both alkaline earth metal cations and dissolved acidic gases from a water source contaminated therewith to produce a substantially nonscaling and noncorroding water supply therefrom. The method includes contacting the contaminated water source with an ion exchange resin to substantially remove the metal cation contaminants contained therein and produce a demineralized intermediate effluent having a pH of less than about 3.5. The demineralized intermediate effluent then is stripped of the acidic gas contaminants dissolved therein and the pH of the stripped effluent adjusted to a value in the range of from about 9.0 to about 10.0.

Abstract: The present invention contemplates a process for reducing the gaseous sulfur dioxide content of flue gases by either or both preheating coal prior to burning the preheated coal and controlling the combustion temperature level to control the amount of sulfur being converted to sulfates and remaining in the ash residue.

Abstract: A visible light activated cavity liner which provides an available source of leachable calcium and fluoride to the base of a tooth cavity, said composition comprising a photopolymerizable matrix material, a photo initiator, a reducing agent, a synthetic hydroxyapatite filler and a powdered glass ionomer filler.

Abstract: The present invention relates to titanium base alloy compositions having substantially improved resistance to corrosion in mineral acid environments and to structures fabricated therefrom. More particularly, the present invention relates to titanium base alloy compositions containing iron and copper in certain specified amounts, the remainder being substantially all titanium apart from incidental impurities therein and to anode structures fabricated therefrom for use in the electrolytic manufacture of battery grade manganese dioxide.

Abstract: A method for sequentially co-processing heavy hydrocarbon materials and carbonaceous materials comprising first subjecting the heavy hydrocarbon material in the presence of a disposable metal catalyst to produce and separate therefrom a first distillate stream and a first non-distillable effluent stream containing the disposable metal catalyst. The first non-distillable effluent stream then is mixed with the carbonaceous material and the mixture subjected to liquefaction conditions in the presence of said disposable metal catalyst. The liquefaction product then is subjected through the use of sequential fractionation and critical solvent extraction processing steps to separate and recover various heavy hydrocarbon and carbonaceous-derived light hydrocarbon liquid products therefrom.

Abstract: A method of forming a two step dental impression which comprises applying a light curable impression material to a portion of the oral cavity of interest to form an initial impression while exposing said impression material to a source of activating light to set said impression material followed by applying a chemically cured impression material over said light cured impression material and allowed said chemically cured impression material to set and bond with said light curable material and removing the resulting composite impression from said oral cavity.

Abstract: The invention relates to a method for substantially reducing the concentration of coal tar based contaminants in waste water streams. The method comprises first forming an intimate mixture of the waste water stream to be treated with at least one coal tar based extractant. The intimate mixture then is subjected to an extraction temperature sufficient to reduce the concentration of the contaminant in the waste water stream to its equilibrium concentration as the extraction temperature employed. Finally, the mixture is separated and a treated waste water stream recovered which is characterized by a substantially reduced and constant concentration of the contaminants and a substantially reduced biological demand.

Abstract: In a metal detector, such as may be used in a bakery, an adjustable phase shifter is provided to adjust the detectors for different products. The adjustable phase shifter is controlled electronically from the output signal so that the arrangement is self-adjusting.

Abstract: In a cable length measurement system, two tangential measuring wheels engage the outer surface or an armored electrical cable and a magnetic mark detector is used for detecting magnetic marks located at a predetermined spacing on the cable while a tension load cell is connected to a cable sheave to measure tension on the cable; the detector in a system which utilizes a "window" period or span which is operated each 98 to 102 feet from a previous magnetic mark to detect valid magnetic marks on the cable which allows detection of magnetic marks substantially independent of the degree of wheel wear, slippage and/or damage; also in the detector system, the constant parameters for the cable, temperatures and coefficients are input to a CPU summation means which also receives measured data inputs of length and tension and the net change of cable length is determined; the net change of cable length is used to constantly correct the cable length measurements sent to a recorder so the log depth is corrected for change

Abstract: The present invention provides for boron-containing wood preserving solutions and a method for their preparation. The wood preserving solutions of the invention are noncrystallizable at ambient temperatures and are prepared from a dispersion of a particulated sodium tetraborate, phosphoric acid and water by heating the dispersion at elevated temperatures and for a period of time sufficient to provide a clear solution. The particulated sodium tetraborate and phosphoric are present in the dispersion in a specific molar ratio of 5:3, said ratio being critical to achieving the noncrystallizable characteristic of the wood preserving solutions of the invention.

Abstract: The present invention comprehends a magnetic mark detector system in which the magnetic detector head is customized to the magnetic span of the North/South poles of a magnetic mark on a cable and is focused to concentrate the specific magnetic characteristics of flux of the magnetic mark to a detector and to exclude the effects of extraneous earth magnetic fields. The magnetic head structure includes spaced apart elongated head members constructed from magnetic material and disposed in an end to end relationship. The head members have an overall length functionally related to the magnetic span of a magnetic mark and focus magnetic flux. Between facing ends of the head members, in a centrally located gap, is a Hall field effect device which responds to magnetic flux and produces an electrical output signal.

Abstract: A process for reducing the sulfur oxide content of flue gases produced by combustion of sulfur-containing coal containing cations of alkali metals, alkaline earth metals or both, in ion exchangeable form. Flue gases containing sulfur oxides are recycled to contact coal awaiting combustion. Sulfur oxides are absorbed on the coal during the contact step, which is conducted in the presence of water. Sulfur oxides react with alkali and alkaline earth metal cations, and are oxidized to form sulfate reaction products. When the treated coal is burned, these sulfate reaction products are retained in the coal ash.

Abstract: A pulse accumulator network for receiving a plurality of pulse trains wherein each pulse train includes a plurality of pulses. The pulse accumulator network accumulates the pulses in each of the received pulse trains and the pulse accumulator network outputs each of the accumulated count of pulses in response to receiving polling signals. The pulse accumulator network is adapted to be utilized in a flow monitoring system, for example, wherein the pulse trains are flow signals indicative of the velocity of the fluid flowing through one of the monitored flowlines.

Abstract: The invention relates to an improved process for drying and preserving wood products. The improved process comprises the steps of first drying the wood products by submerging them in a naphthalene poor, coal tar based heat transfer medium under conditions of elevated temperature and reduced pressure. The dried wood products then are impregnated with a naphthalene rich, coal tar based wood preservative agent by submerging said dried wood products in said agent under conditions of both elevated temperature and pressure.

Abstract: A resilient flexible pipe coupling for interconnecting two pipes of different diameters in a pressure tight manner comprises a tubular metal casing formed with a longitudinal gap and a tensioning screw device for reducing the width of the gap to tighten the coupling around the adjacent ends of the two pipes. A sealing sleeve of resilient flexible material is arranged within the casing. The sleeve has radially inwardly projecting sealing lips formed on both of its free end. The sealing lips have different radial thicknesses so as to compensate for the difference in diameters of the pipes.

Abstract: A nozzle and a method for spraying a liquid into a vessel opening through such a nozzle wherein the nozzle includes a casing assembly and a core. The casing assembly has a casing opening which extends through the upper end of the casing assembly and extends a distance through the casing assembly and a discharge nozzle opening formed through a central portion of the lower end of the casing assembly. The core has an upper and a lower end and an outer peripheral surface and the core is disposed and supported within the casing opening generally between the upper and the lower ends of the casing and spaced a distance above the discharge nozzle opening. The core has swirl openings formed through the core intersecting the upper and the lower ends of the core and being disposed generally near the outer peripheral surface of the core and a central opening formed through a central portion of the core.

Abstract: The present invention relates to improvements in impregnated wood preserving processes utilizing naphthalene containing preservative agents comprising recovering that portion of the naphthalene stripped from the preservative agent during a drying phase in the process and returning said recovered naphthalene portion to the impregnation phase of said process.