Abstract: A pollution-free process for the recovery of high purity zinc from zinc containing material including sulfide ores which provides for maximum conservation and re-use of reagents, the process consisting of chlorinating the materials either with ferric chloride or chlorine gas followed by selective removal of metals other than zinc by standard procedures, such as, lead chloride crystallization, cementation, etc. to produce a solution containing essentially only zinc chloride and ferrous chloride. To enhance the purity of the zinc end product zinc chloride is separated from the ferrous chloride solution with a zinc selective extraction agent from which the zinc chloride is stripped with sodium chloride solution in a sodium chloride stripping circuit followed by precipitation of zinc as the carbonate.

Abstract: There is provided a membrane-free axial flow electrolytic cell in which the anodes and cathodes are perforated and lie transversely of a conduit through which an ion containing and conducting medium is pumped. This device is especially useful in the electrolytic recovery of metal values from acid leach solutions from low grade ores, e.g., copper, and for the carrying out of electrochemical reactions such as the production of sodium hypochlorite or sodium chlorate from NaCl.

Abstract: A process is disclosed for separating cuprous chloride from a solution comprising cuprous chloride and at least one metal chloride compatible with the solubility of cuprous chloride, the process comprising crystallizing the cuprous chloride from the solution in the presence of cupric chloride in an amount such that the cupric chloride to compatible metal chloride mole ratio is at least about 0.1.

Abstract: A stippled base sheet material with a coating thereon of color differing from the color of the base material is so constructed that when selected stipples are cut off, letters, numbers or other indicia may be formed of a color of the base material in a background the color of the coating. Also, method of making the sheet material, method of making an identification article therefrom, and the identification article are disclosed.

Abstract: Carbonization of coal in travelling grate furnace with hot gas inlets below the grate. A refractory screen is provided above the grate to provide a flame propagation base for the volatile gases withdrawn from the coal on the grate. The combustion zone above the refractory screen provides radiant heat to vaporize volatiles present in the coal on the grate.The coal to be treated may be in the form of briquettes or an extruded slab. When an extruded slab of slurried coal is used the thermal shock on first entering the carbonization chamber results in the formation of carbon granules.

Abstract: A matched and correlated set of golf club irons is produced by preparing a series of shafts which vary substantially uniformly in flexibility and securing the most flexible shaft to the lowest numbered head in the set, securing the next less flexible shaft to the next higher numbered head, and repeating the process until all the shafts and heads are joined. The shafts are prepared by providing a first group of basic stock shafts of substantially identical stiffness characteristics and cutting off the tip ends in uniformly increasing increments to vary the flexibility. The first group of shafts is connected to heads from the lowest number to one of the middle distance irons. A second group of basic stock shafts having identical stiffness characteristics greater than the first group is similarly prepared and provided for the higher numbered heads.

Abstract: Coal particles are made resistant to spontaneous combustion by coating them with silicon dioxide by a vapor deposition process in which the particles in a coating chamber are contacted at a temperature that promotes the deposition on the particles of the reaction products between silicon tetrachloride vapor and water, the coating step followed by elevating the chamber temperature to drive off water vapor and hydrochloric acid.

Abstract: Copper is recovered from chalcopyrite by means of a pollution-free hydrometallurgical process which entails leaching and converting the chalcopyrite with copper sulfate in order to produce an insoluble copper sulfide, a soluble iron sulfate and sulfuric acid. A secondary leach is then conducted in order to react the copper sulfide with oxygen in the presence of a jarosite-forming cation to produce a soluble copper sulfate and an insoluble iron bearing jarosite. This copper sulfate is separated from the jarosite and sent to a copper recovery process and/or recycled. Alternatively, the copper sulfide from the initial leach may be separated from the iron sulfate solution immediately after the initial leach, and this copper sulfide can be treated with other processes to produce elemental copper and sulfur.

Abstract: There is provided a rotary dryer having an elongated rotatable tubular shell, the shell being axially subdivided into zones including a feed zone, a material distribution zone and at least one drying zone. In the drying zone there is provided a plurality of radially inwardly extending flight support members, the leading edges of which face the inlet end of the shell and extend inwardly and rearwardly from the inner surface of the shell toward the central axis thereof whereby hang up of fibrous material on the leading edges thereof is minimized. A plurality of longitudinally extending flights is secured to each of the support members.

Abstract: Catheter of the telescope tube, expandable wing type, characterized by the provision of alternative forms of means for preventing outward leakage from between the tubes, the leakage preventing means also serving the additional purpose of retaining the wings in expanded position. Alternative forms of tube distal ends are disclosed including one form for removing clots from blood vessels. Also, a stiff trochar rod may be employed with various forms of seals and the tube distal ends.

Abstract: A communication system that uses a separate single coaxial cable to link a nurse's station to each of a plurality of patient rooms is disclosed. Each cable carries DC message signals from the patient rooms to the nurse's station to alert the nurse on duty that her assistance is needed either on an emergency or on a non-emergency basis. The coaxial cables also carry AC power to power TV receivers located in the patient rooms. In addition, the coaxial cables carry normal video signals to the receiver; audio and visual communication signals between patients and the nurses station; and, telemetry from patient sensors to the nurses station. Further, the system is adapted to automatically allow a patient to view the nurse at the nurses station on the TV receiver located in the patient's room when the patient is communicating with the nurse regardless of whether or not the TV receiver was on or off at the time such communication commences.

Abstract: There is provided an improved support for a hospital communication system characterized by a wall mount, an articulated arm secured to the wall mount at one end, and at the other end to a communicator mount, the latter being attached to a communicator unit having signal transmitting means and signal receiving means and characterized in that the communicator unit is rotatable in a vertical plane through a limited arc for convenient viewing by a reclining or sitting patient, and being easily positioned by the patient.

Abstract: There is provided an improved static mixing apparatus which comprises in combination a tubular body and a static mixing element preferably coextensive in length with the tubular body and disposed therein in fluid flow intercepting relation. The static mixing element is characterized by a plurality of alternately oppositely extending first triangular elements from a common center line whereby the laterally extending first triangular elements are in axially staggered relation, and a plurality of second triangular members each having one apex on the common center line and each having a side in common with a first triangular element, and each of the second triangular elements lying in a plane angularly related to the first triangular element with which it has a side in common.The second triangular elements lie in sectors about the common center line.

Abstract: A method for the separation and recovery of elemental sulfur from mixtures of foreign material and sulfur which comprises washing the foreign material and sulfur mixture to remove impurities which are deleterious to coalescence of the sulfur particles followed by adding as a cleansing and coalescence agent an alkali metal hydroxide or carbonate, heating the mixture to a temperature above the melting point of sulfur for one hour to coalesce the sulfur particles, and separating the coalesced sulfur from the foreign material.

Abstract: A process for improving coal wherein the raw coal is reacted with substantially undecomposed iron carbonyl which alters the apparent magnetic susceptibility of certain impurity components contained in the raw coal thereby permitting their removal by low intensity magnetic separators. The process is especially effective for removing pyrite from coal, while at the same time reducing ash and increasing the calorific value.

Abstract: A tool in its preferred form includes a body, a file carried by the body for filing the bottom and side edges of a ski, a scraping blade carried by the body to remove excess wax and filler and to press wax into the ski surface, and a cork block to serve as a handle and to polish a ski bottom surface. The body may be of any desired shape but is preferably right triangular in planform and shallow compared to its lateral and longitudinal dimensions. A first face has a seat for a file along its diagonal aft margin and a guide wall along its longitudinal side margin which guides the body for longitudinal movement along the ski with the file crossing the ski bottom diagonally. The forward end contains a seat to hold a scraper blade for scraping excess filler and wax from the bottom and for pressing wax into the ski surface. The cork block protrudes from the second face of the body to serve as a handle and also to polish the waxed ski surface.

Abstract: An intrauterine contraceptive device is provided which is inserted into a uterus in a collapsed position and is held in an expanded position by introduction of a self-hardening liquid plastic into the device after it is positioned within the uterus. In one embodiment the device is provided with an inflatable membrane for positioning it within the uterus prior to insertion of the liquid plastic, after which the membrane is deflated and in some instances removed. In another embodiment the device comprises a plastic tube with a resilient rod therein which may be deformed to insert the device in the uterus and after being positioned therein a liquid self-hardening plastic is introduced into the tube to hold the resilient rod in an expanded position that conforms to the uterine cavity.

Abstract: Electrically operated lock for a closure, such as a truck door, characterized by a bolt movable between locked and unlocked positions and latched against movement in both positions, the bolt movement being under control of a two position switch and other switches which disconnect electrical energization when the bolt moves to either position. The apparatus is located at an inaccessibly position, preferably inside the truck, to prevent tampering therewith from outside the truck.

Abstract: Accelerated reaction rates and improved yields are accomplished when sulfides of metals of groups Ib, IIb, IVa, Va and VIII of the Periodic Table are oxidized in aqueous medium to convert the sulfide sulfur to elemental sulfur by performing the reaction in the presence of activated carbon.

Abstract: Means for scientifically supervised use when treating severe injuries and infections of the human eye. It enables a doctor or his nurse to administer a regulable but constant instillation of an antibiotic solution, chemotherapeutic agents, steroids or like solutions to the corneal area of the eyeball. A molded shield is conformingly superimposed on the eyeball and embodies a centralized concavo-convex corneal lens surrounded by a rim-like annulus which resides conformingly atop the sclera. Flexible tubing delivers the solution from a solution feeding bottle to the annulus in a manner that the eyeball is continuously lavaged while the over-all shield "floats" atop the constantly existing film of fluid.