| Patent Number |
Title Of Patent |
Date Issued |
| 4498073 |
Keyboard with simultaneous operations |
February 5, 1985 |
| A keyboard in which, when one of the function keys is depressed simultaneously with one of the character keys, the signal generated by the depressed function key is transmitted during a first period of time following the key-stroke which depressed the keys, and the signal generated b |
| 4484944 |
Reduction of iron ores by hydrocarbons |
November 27, 1984 |
| The iron ores hematite, magnetite, limonite and siderite are reduced to iron by chemical reactions of the oxides in the ores with hydrocarbon gases in the absence of oxygen and oxygen compounds except carbon dioxide, in the input to the reaction chamber, other than the iron oxides. With |
| 4456990 |
Periodic wave elimination by negative feedback |
June 26, 1984 |
| Means and method for substantially eliminating a selected periodic wave from a frequency band-limited combined wave containing other waves. The combined wave is sampled in a sampling gate, opened by short gating pulses with a frequency equal to the selected frequency divided by an intege |
| 4429546 |
Heat transfer in gas compression |
February 7, 1984 |
| In a gas compression system, heat rejected from the prime mover and the compressor is transferred from them to the loads driven by the compressed gas. This heat transfer reduces the energy required from the prime mover for delivery of a given amount of energy by the output load, and henc |
| 4406006 |
Dual-signal A-M receiving apparatus |
September 20, 1983 |
| Receiving apparatus for a modified quadrature A-M dual-signal wave, which samples the input wave and separates and reconstructs the signals in analog form. Superimposed noise in the frequency band of the modulated wave may be substantially reduced in both signals. The signals may be |
| 4397381 |
Magnetic brakes and clutches |
August 9, 1983 |
| Drum-type brakes and band-type clutches which are activated by expansion or compression, or both, of one or more concentric magnetic members, with conducting windings carrying electric currents. Circular annular mating members carrying one or more conducting windings expand or contract i |
| 4387335 |
Constant-frequency dynamo with stationary armature |
June 7, 1983 |
| A dynamo with a stationary armature and with two rotors, with the frequency of the armature current the same as the frequency of the field excitation and independent of the speed of rotation of the rotors. The rotors have opposite instantaneous magnetic polarities, are magnetically conne |
| 4344483 |
Multiple-site underground magnetic heating of hydrocarbons |
August 17, 1982 |
| A first underground deposit of lignite or coal is heated by magnetic induction to recover hydrocarbon liquids and gases. The carbon remaining is combusted with air and steam to produce a gas which is combusted to generate electrical energy. The electrical energy is transmitted to second |
| 4227662 |
Air turbulence reducer |
October 14, 1980 |
| An aircraft carries a pressure indicator well in advance, which may record barometric pressure of vertical air currents. The indicator reading is converted to electric current and averaged over a short period. The unaveraged current at a given position of the pressure indicator is re |
| 4217748 |
Safe wire rope |
August 19, 1980 |
| Steel wire rope used for lifting and hauling is dangerous when stressed above the breaking point, as there is a substantial quantity of energy stored in the stretched rope and when the rope breaks the stored energy causes the broken ends to whip at high velocity, in a number of recorded |
| 4205241 |
Quantized modulation systems |
May 27, 1980 |
| A system for modulation of the amplitude of a d-c voltage, the amplitude of an a-c carrier, or the frequency of an a-c carrier by signal, in which the signal amplitude is continuously compared against a predetermined series of equally-spaced d-c voltages, and coincidence-sensing and swit |
| 4178553 |
Sampling modulated waves |
December 11, 1979 |
| The method of transmission of a carrier double-sideband amplitude-modulated by a message, comprising sampling the modulated wave at regular intervals at a sampling rate greater than twice but less than four times the highest message frequency, with the sampling rate an integral sub-multi |
| 4168890 |
Automatic focusing device |
September 25, 1979 |
| This invention discloses an automatic focusing device for cameras and other optical apparatus which comprises scanning means for at least a portion of the focused image, and the scanning current varies the focusing means automatically until the scanning current shows a maximum of high-fr |
| 4162475 |
Transducer utilizing sampling |
July 24, 1979 |
| A transducer for generating pressure waves from electrical signal waves, in air, water or other fluid, which consists of a plurality of orifices in a vessel containing the transmission fluid under pressure, each orifice being controlled by a valve, which in turn is controlled by one of a |
| 4153882 |
High-efficiency amplifier |
May 8, 1979 |
| This invention provides a method and means for amplifying signal waves with high efficiency that comprises signal sampling means operating at the Nyquist rate or greater, sample-quantizing means, a plurality of circuits that link the quantizing means to a plurality of controlled curr |
| 4116273 |
Induction heating of coal in situ |
September 26, 1978 |
| The electric induction heating in situ of a selected portion of an underground coal deposit, for the purpose of facilitating extraction of gases, liquids, solids and energy from the deposit. The heating is conveniently effected by passing a time-varying electrical current through a c |
| 4053856 |
Quasi-toroidal inductor and resonator |
October 11, 1977 |
| An inductor comprises a quasi-toroidal conductive envelope having a discontinuity across which alternating voltage may be applied. The inductor may comprise a plurality of interrupted turns connected in parallel or may be formed by a continuous conductive shell. The cross-section of |
| 4049053 |
Recovery of hydrocarbons from partially exhausted oil wells by mechanical wave heating |
September 20, 1977 |
| Underground viscous hydrocarbon deposits, such as the viscous residues in conventional oil wells, are heated by mechanical wave energy to fluidize the hydrocarbons thereby to facilitate extraction thereof. For uniform, circular, symmetrical dispersion of mechanical wave energy of high-po |
| 4043393 |
Extraction from underground coal deposits |
August 23, 1977 |
| A method of extracting hydrocarbons, energy and other products in situ from an underground coal deposit. A selected part of the coal deposit is heated by electrical induction to temperatures high enough to effect the destructive distillation of coal. The gases and liquids so produced are |
| 4008762 |
Extraction of hydrocarbons in situ from underground hydrocarbon deposits |
February 22, 1977 |
| A method of extracting hydrocarbons in situ from an underground hydrocarbon deposit such as oil shale. A selected part of the deposit is heated by one or more electrical induction coils arranged in a quasi-toroidal configuration to temperatures high enough to drive off hydrocarbon fr |
| 4008761 |
Method for induction heating of underground hydrocarbon deposits using a quasi-toroidal conducto |
February 22, 1977 |
| A method of heating hydrocarbons in situ in an underground hydrocarbon deposit such as bituminous sands or oil shale. A selected part of the deposit is heated by electrical induction coils arranged in a quasi-toroidal configuration to temperatures high enough to facilitate extraction |
| 3989107 |
Induction heating of underground hydrocarbon deposits |
November 2, 1976 |
| The electric induction heating in situ of a selected portion of an underground deposit of hydrocarbons (such as petroleum, especially petroleum entrapped within a sand formation or the like, or lignite), for the purpose of facilitating extraction of hydrocarbons from the deposit. The |
| 3988036 |
Electric induction heating of underground ore deposits |
October 26, 1976 |
| A method of extracting metal from an underground ore body. The body is heated by electric induction to a temperature sufficient to break up the metallic ore compound and liquefy the metal. The metal flows into production wells where it is collected and transported to the surface, as |
| 3972372 |
Exraction of hydrocarbons in situ from underground hydrocarbon deposits |
August 3, 1976 |
| A method of extracting hydrocarbons in situ from an underground hydrocarbon deposit (such as petroleum or lignite). A selected part of the deposit is heated by electrical induction to temperatures high enough to drive off hydrocarbon fractions as gases or vapors, which are then collected |
