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| Number | Title | Issue Date |
| 3973949 | Zinc recovery by chlorination leach 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 chlo... | 08/10/1976 |
| 3972795 | Axial flow electrolytic cell 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 elect... | 08/03/1976 |
| 3972711 | Cuprous chloride recovery process 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 solut... | 08/03/1976 |
| 3966561 | Apparatus for the carbonization of coal 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 A refractory screen is provided above the grate to provide a flame propagation base for the volatile gases withdrawn from the coal on the grate.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 abo... | 06/29/1976 |
| 3965598 | Identification device and method of making same 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 ba... | 06/29/1976 |
| 3963236 | Golf club set and method of making 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 shaf... | 06/15/1976 |
| 3961914 | Process for treating coal to make it resistant to spontaneous combustion 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 ... | 06/08/1976 |
| 3957602 | Recovery of copper from chalcopyrite utilizing copper sulfate leach 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 a... | 05/18/1976 |
| 3950861 | Rotary dryer for stringy material 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 ... | 04/20/1976 |
| 3946741 | Urethral catheter and body drainage device 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 win... | 03/30/1976 |
| 3946159 | Hospital communication system 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... | 03/23/1976 |
| 3942751 | Mount for hospital communications system 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 uni... | 03/09/1976 |
| 3942765 | Static mixing apparatus 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 mix... | 03/09/1976 |
| 3938966 | Process for improving coal 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 i... | 02/17/1976 |
| 3939256 | Sulfur recovery process 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 fol... | 02/17/1976 |
| 3934287 | Combination ski maintenance tool 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 a... | 01/27/1976 |
| 3933152 | Intrauterine contraceptive device 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 on... | 01/20/1976 |
| 3933382 | Security lock 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 ... | 01/20/1976 |
| 3930969 | Process for oxidizing metal sulfides to elemental sulfur using activated carbon 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 i... | 01/06/1976 |
