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| Number | Title | Issue Date |
| 4235081 | Compressed air dryer An improved compressed air dryer unit having an air-to-air heat exchanger and an air-to-refrigerant heat exchanger separately mounted on a common base plate and connected in series for air flow therethrough in succession. Each exchanger comprises a tubula... | 11/25/1980 |
| 4234754 | Oil-filled electric cable installations comprising pressurizing oil tanks An oil-filled electric cable installation, in which oil when flowing outwardly from the cable to a pressure-maintaining oil tank it passes through a percolating filter, preferably of an active material, to remove particulate and/or dissolved impurities. A... | 11/18/1980 |
| 4231818 | Methods of producing silicon steel strip A method of producing silicon steel strip from slabs is provided which includes the steps of reducing the slabs in a planetary mill to a thickness of 0.060 to 0.10 inch at a temperature above that at which MnS will precipitate, cooling to between 800° F.... | 11/04/1980 |
| 4230987 | Digital eddy current apparatus for generating metallurgical signatures and monitoring metallurgical contents of an electrically conductive material The apparatus comprises a parallel coil and a capacitance, the coil having an air gap in which an unknown specimen is inserted, a source of alternating voltage applied to the coil-capacitance combination, scanning means for automatically varying the value... | 10/28/1980 |
| 4231011 | Discontinuous metal film resistor and strain gauges An improved discontinuous film resistor and strain gauge is disclosed wherein the discontinuous metal film is maintained in a constant humidity in the range of 15% to 45% thereby substantially increasing the life of the strain gauge.... | 10/28/1980 |
| 4229146 | Air compressors An air compressor assembly is provided having a high pressure air receiver, a compressor, an outlet port and an inlet port on said compressor, said inlet port having a normally closed spring loaded inlet valve, the improvement comprising a two position no... | 10/21/1980 |
| 4227920 | Methods of clay benefication A method of beneficiating highly discolored clays to produce a clay of acceptable quality to the paper industry is provided by passing a deflocculated clay suspension through a high intensity magnetic separator, thereafter selectively flocculating the cla... | 10/14/1980 |
| 4227145 | Apparatus for detecting faults in electric cables Apparatus is provided for use in combination with an electric power distribution cable and the normal source of voltage supply to said cable, the cable being connected between said normal source of voltage supply and at least one load normally applied to ... | 10/07/1980 |
| 4223869 | Load binder apparatus A load binder or lashing tightener is provided made up of a first inner elongate sleeve member closed at one end, an anchor fitting on said closed end, a thread nut in the other end of said first sleeve, a second outer sleeve having one end adapted to tel... | 09/23/1980 |
| 4224058 | Methods of desulphurizing fluid materials A method for desulphurizing fluid materials such as molten iron, steel, stack gases, synthetic natural gases, boiler gases, coal gasification and liquification products and the like is provided in which one of the group rare earth oxides, rare earth fluoc... | 09/23/1980 |
| 4223175 | Cable support systems An electric cable support system is provided having means for supporting electric cables and an elongate metal duct housing said support means and divided transversely into separately formed parts that are detachably secured together, the internal surface... | 09/16/1980 |
| 4222857 | Apparatus for separating selected particulate materials from a mixture of solids and liquids A chemical reagent is mixed with the mixture to form a resultant reaction mixture under substantially nonoxidizing or oxygen-free conditions. A continuous movement of the resultant reaction mixture is established through a flotation zone while maintaining... | 09/16/1980 |
| 4221947 | Annealing of wire In a method of continuously heating wire by induction, a short circuit electrical connection between wire entering a loop or loops, constituting the secondary winding of a transformer, and wire leaving the loop or loops is effcted by guiding a portion of ... | 09/09/1980 |
| 4218889 | Mass transit systems A mass transit system is provided which derives its basic energy from the solar system and recovered heat energy. The system of the invention provides a storage building having a roof and an internal storage area for a multiplicity of individual wheel veh... | 08/26/1980 |
| 4215855 | Cooling bed for elongate articles A cooling bed for cooling and straightening rods or bars which are delivered hot from a rolling mill as side-by-side conveyor chains provided with projections between which pockets for the articles are defined. Reversal sprocket wheels at the infeed end a... | 08/05/1980 |
| 4215579 | Coal sampling The specification discloses portable coal sampling apparatus including an enclosure, a primary sample receiving hopper, a primary sample crusher arranged to receive coal from the hopper and deliver crushed coal to the enclosure, and a secondary sample col... | 08/05/1980 |
| 4215742 | Exhaust coolers An exhaust gas cooler for internal combustion engines of land based vehicles is provided having an outer elongate housing and a pair of spaced inner housings forming within them exhaust gas passages and with coolant passages between the walls of the inner... | 08/05/1980 |
| 4214664 | Crane safety reeving A two drum or similar take-up crane hoist is provided having an intermediate sheave deck between the crane trolley and a lift beam and a combination of vertical and cross-over reeving over the sheave deck so as to support both ends of the lift beam from e... | 07/29/1980 |
| 4211386 | Slow opening cylinder valve A valve for controlling the flow of gases from high pressure cylinders is provided having a projected raised annular valve seat surrounding a gas passage, a stem in threaded relation to the valve body whereby rotation of the valve stem in the valve body m... | 07/08/1980 |
| 4210230 | Flat-pack luggage case A luggage case or bag of the unstructured type having a semi-rigid support frame with a plurality of strips fixed on the interior of the case, such as at the four corners, forming pockets into which thin flexible sheets or inserts of lightweight material ... | 07/01/1980 |
| 4210056 | Valve construction for brass wind instrument An improved piston valve construction for valved wind instruments such as trumpets, bugles, and the like is provided having portions of varying diameter which may be employed in conventional piston valve casings. Such improved valve construction comprises... | 07/01/1980 |
| 4210174 | Positive pressure valves A positive pressure valve is provided having a valve member with a central magnetically attracted member spaced from and coaxial with a rod like magnet, said valve member and magnet being relatively movable to adjust the magnetic attraction between them a... | 07/01/1980 |
| 4209128 | Methods and apparatus for classifying fine particle solids A method and apparatus are provided for classifying fine particle materials from a fluid suspension in the form of a rotatable cylindrical bowl, a rotatable shaft on which said bowl is rotated, means for independently rotating each of said bowl and shaft ... | 06/24/1980 |
| 4208399 | Tolyl isocyanate test antigens, methods for their preparation and use in detecting diisocyanates and antibodies to diisocyanates An antigen and a method for its preparation and use in detecting antibody to a selected diisocyanate is provided by reacting the monoisocyanate derivative of the diisocyanate with a protein, incubating the antigen on a paper disc with test serum in the pr... | 06/17/1980 |
| 4207808 | Piston for reciprocating internal combustion engines, typically diesel engines An improved piston structure for Diesel and like reciprocating piston engines is provided having a top and foot, a sealing section on said piston connecting said top and foot, a guide section articulatedly connected to said sealing section through trunnio... | 06/17/1980 |
| 4206794 | Ratchet driver A ratcheting screwdriver is provided having an integral handle, shank and blade with a receiver body intermediate the handle and blade removably receiving a ratchet drive handle.... | 06/10/1980 |
| 4206002 | Graded band gap multi-junction solar energy cell The specification discloses a solar cell having a graded band gap and a plurality of alternately active and inactive p-n junctions. The cell has a gradually changing monocrystalline structure of IIIA-VA compounds. The graded band gaps of the cell are the ... | 06/03/1980 |
| 4202430 | Brake actuating mechanisms The disclosure relates to a brake actuating mechanism in which a brake applying member is urged to apply a brake by a heavy coil spring. To release the brake a pivoted lever acts on the brake applying member and is moved in a brake releasing direction by ... | 05/13/1980 |
| 4200237 | Fuel injector A fuel injector for internal combustion engines having an axially slidable nozzle needle capable of being lifted off its sealing seat by pressure of fuel against at least one spring and having a control pintle below the sealing seat sliding in a blind-hol... | 04/29/1980 |
| 4199225 | Optical guides An optical cable comprises an extruded elongate body of rubber or plastics material having at least one bore extending lengthwise in the body, and, embedded in the extruded elongate body and arranged side-by-side with the bore or bores, at least one separ... | 04/22/1980 |
| 4199549 | Method of operating an incinerator The specification discloses and describes a method and means of operating an incinerator whereby the concentration of evaporated solvent or other combustible materials delivered to an incinerator is controlled as a reflection of the temperature of the gas... | 04/22/1980 |
| 4196838 | Methods for the manufacture of longitudinal-seam welded tubes A method for the manufacture of longitudinal-seam welded tubes of substantial thickness is provided in which a strip of steel is curled to form a longitudinally slit tube and the slit is welded in a longitudinal-seam welding plant and in which the seam-we... | 04/08/1980 |
| 4195546 | Chord selector A chord selector is used on a stringed instrument such as a guitar. The selector has a body portion adapted to fit over the head end and a plurality of flexible curved arms. Each arm is movable over a base and through a passageway and has a tip projecting... | 04/01/1980 |
| 4195906 | Optical guides An optical cable comprises at least one optical cable element and, surrounding the optical cable element or elements, a flexible tube of rubber or plastics material, the bore of the tube being of such a transverse cross-section having regard to the transv... | 04/01/1980 |
| 4194366 | Two speed valves and bi-directional motor system A two speed valve and bi-directional motor system is provided having a pair of motors, means for delivering pressure fluid selectively to either side of said motors, a two speed valve means receiving fluid on one side of said motors to selectively direct ... | 03/25/1980 |
| 4193274 | Yarn feed and change mechanisms A yarn feed and change mechanism or striper (FIG. 3) has a plurality of yarn feed passages which can be used alternatively to feed yarn to a knitting machine. Each yarn feed passage is associated with a pneumatic means (22, 24, 84) for propelling a leadin... | 03/18/1980 |
| 4193068 | Hemorrhage alarms A hemorrhage alarm system having an electrically operated signal device, a source of electrical current, a circuit connecting said current source and signal device, a normally open switch in said circuit and a means swelling on contact with blood and body... | 03/11/1980 |
| 4192164 | Rolling mills A rolling mill and method for single strand rolling of bar sections is provided having a plurality of successive in-line roughing roll stands on a pass line in which the last two roughing roll stands are radially adjustable transverse to the pass line to ... | 03/11/1980 |
| 4191529 | Furnace for heating solids The furnace is circular in plan and comprises an annular charge space charged through chutes in its top wall. Effluent gas offtakes are provided in the furnace outer wall and the level of the charge bed is maintained above the chute bottoms but below thos... | 03/04/1980 |
| 4191041 | Rolling mills A rolling mill for rolling wire or rod product having a plurality of roll stands arranged one after the other, each having at least three driven rollers and in which the distance between at least two adjoining successive stands forming a group is not subs... | 03/04/1980 |
