Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 5608179 | Catalytic ignitor for regenerative propellant gun An ignitor initiates combustion of liquid propellant in a gun by utilizing a heated catalyst onto which the liquid propellant is sprayed in a manner which mitigates the occurrence of undesirable combustion chamber oscillations. The heater heats the cataly... | 03/04/1997 |
| 5573873 | Long life NA/NiCl2 cells The premature capacity failure of Ni/NiCl2 secondary cells due to agglomeration of nickel particles on the surface of the NiCl2 cathode is prevented by addition of a minor amount, such as 10 percent by weight of a transition metal su... | 11/12/1996 |
| 5490035 | Cyanoresin, cyanoresin/cellulose triacetate blends for thin film, dielectric capacitors Non brittle dielectric films are formed by blending a cyanoresin such as cyanoethyl, hydroxyethyl cellulose (CRE) with a compatible, more crystalline resin such as cellulose triacetate. The electrical breakdown strength of the blend is increased by orient... | 02/06/1996 |
| 5484580 | High temperature sorbents for oxygen A sorbent capable of removing trace amounts of oxygen (ppt) from a gas stream at a high temperature above 200° C. comprising a porous alumina silicate support such as zeolite containing from 1 to 10 percent by weight of ion exchanged transition metal suc... | 01/16/1996 |
| 5298796 | Nonvolatile programmable neural network synaptic array A floating-gate MOS transistor is implemented for use as a nonvolatile analog storage element of a synaptic cell used to implement an array of processing synaptic cells based on a four-quadrant analog multiplier requiring both X and Y differential inputs,... | 03/29/1994 |
| 4843439 | Tailorable infrared sensing device with strain layer superlattice structure An infrared photodetector is formed of a heavily doped p-type Gex Si1-x /Si superlattice in which x is pre-established during manufacture in the range 0 to 100 percent. A custom tailored photodetector that can differentiate among clo... | 06/27/1989 |
| 4840496 | Noncontact temperature pattern measuring device Laser pyrometer techniques are utilized to accurately image a true temperature distribution on a given target without touching the target and without knowing the localized emissivity of the target. The pyrometer utilizes a very high definition laser beam ... | 06/20/1989 |
| 4800756 | Acoustic controlled rotation and orientation Acoustic energy is applied to a pair of locations spaced about a chamber, to control rotation of an object levitated in the chamber. Two acoustic transducers applying energy of a single acoustic mode, one at each location, can (one or both) serve to levit... | 01/31/1989 |
| 4779428 | Joule Thomson refrigerator A bi-directional Joule Thomson refrigerator is described, which is of simple construction at the cold end of the refrigerator. Compressed gas flowing in either direction through the Joule Thomson expander valve and becoming liquid, is captured in a contai... | 10/25/1988 |
| 4777823 | Controlled sample orientation and rotation in an acoustic levitator A system is described for use with acoustic levitators, which can prevent rotation of a levitated object or control its orientation and/or rotation. The acoustic field is made nonsymmetrical about the axis of the levitator, to produce an orienting torque ... | 10/18/1988 |
| 4773266 | Stabilization and oscillation of an acoustically levitated object Methods are described for rapidly damping oscillation of an acoustically levitated object or for causing and maintaining such oscillations, and a method is provided for determining the restoring force constant K on the levitated object by measuring its fr... | 09/27/1988 |
| 4772785 | Dynamic range compression/expansion of light beams by photorefractive crystals Apparatus is provided which greatly reduces the intensity of bright portions of an image while only moderately reducing the brightness of dimmer portions of the image, to thereby compress the range of light intensities to facilitate detection of the image... | 09/20/1988 |
| 4772101 | Remotely controllable real-time optical processor An optical processor is provided which facilitates selection of any of a variety of patterns or images which are to be compared with a Fourier transform of a template image, wherein the processor can be constructed at low cost. One of the two images that ... | 09/20/1988 |
| 4771212 | High voltage gas isolator An isolator is provided which has an inlet at ground electrical potential which receives gas, and which has an outlet at a high electrical potential through which gas is discharged, the isolator being compactly and simply constructed while providing a lon... | 09/13/1988 |
| 4770455 | Passively activated prehensile digit for a robotic end effector A common hydraulic reservoir holds one or more rows of slidable pistons or "fingers" in a base, or "hand". The individual fingers in each row expose graduated cross-sectional fluid application areas to the hydraulic fluid in the reservoir, with the smalle... | 09/13/1988 |
| 4771250 | Digital phase-lock loop having an estimator and predictor of error A digital phase-lock loop (DPLL) which generates a signal with a phase that approximates the phase of a received signal with a linear estimator. The effect of a complication associated with non-zero transport delays related to DPLL mechanization is then c... | 09/13/1988 |
| 4765139 | Thermocouple for heating and cooling of memory metal actuators A semiconductor thermocouple unit is provided for improving heating and cooling of memory metal actuators. The semiconductor thermocouple unit is mounted adjacent to a memory metal actuator and has a heat sink connected thereto. A flexible thermally condu... | 08/23/1988 |
| 4766533 | Nanosequencer digital logic controller A digital logic controller providing instruction execution times on the order of 50 nanoseconds and employing a read-only memory outputting instructions to a pipeline register, a portion of each instruction providing a status-select control signal and add... | 08/23/1988 |
| 4757278 | Low noise cryogenic dielectric resonator oscillator A microwave oscillator is provided which can operate at a temperature of many degrees above absolute zero while providing very low phase noise that has heretofore generally required temperatures within a few degrees K. The oscillator includes a ring-shape... | 07/12/1988 |
| 4750144 | Real time pipelined system for forming the sum of products in the processing of video data A 3-by-3 convolver utilizes 9 binary arithmetic units (10) connected in cascade for multiplying 12-bit binary pixel values pi which are positive or two's complement binary numbers by 5-bit magnitude (plus sign) weights wi which may b... | 06/07/1988 |
| 4737796 | Ground plane interference elimination by passive element The radiation pattern of a beam at elevation angles near the horizon is improved for phased array antennas by control of the radiation field intensity near the horizon to reduce multipath disturbances, and to improve the axial ratio of a circularly polari... | 04/12/1988 |
| 4726890 | Method of producing high Tc superconducting NbN films Thin films of niobium nitride with high superconducting temperature (Tc) of 15.7° K. are deposited on substrates held at room temperature (~90° C.) by heat sink throughout the sputtering process. Films deposited at PAr >12.9&#b1;0.... | 02/23/1988 |
| 4725773 | Cross-contact chain A system is provided for use with wafers that include multiple integrated circuits that include two conductive layers in contact at multiple interfaces. Contact chains are formed beside the integrated circuits, each contact chain formed of the same two la... | 02/16/1988 |
| 4721462 | Active hold-down for heat treating A vacuum hold-down is described, for holding a thin film workpiece while it undergoes large temperature changes and corresponding dimensional changes, which permits creep of the workpiece to avoid damage thereto while still holding it on a support surface... | 01/26/1988 |
| 4711857 | Tailorable infrared sensing device with strain layer superlattice structure An infrared photodetector is formed of a heavily doped p-type Gex Si1-x /Si superlattice in which x is pre-established during manufacture in the range 0 to 100 percent. A custom tailored photodetector that can differentiate among clo... | 12/08/1987 |
| 4703967 | Self-locking double retention redundant pull pin release A double-retention redundant pull pin release system is disclosed. The system responds to a single pull during an intentional release operation. A spiral-threaded main pin is seated in a mating bore in a housing, which main pin has a flange fastened there... | 11/03/1987 |
| 4704197 | Isotope separation using tuned laser and electron beam Apparatus and method for producing a stream (56) of a selected isotope. The apparatus comprises means for producing an atomic beam (26) containing the isotope of interest and other isotopes. Means (48) are provided for producing a magnetic field (28) trav... | 11/03/1987 |
| 4703513 | Neighborhood comparison operator Digital values in a moving window are compared by an operator having nine comparators (18) connected to line buffers (16) for receiving a succession of central pixels together with eight neighborhood pixels. A single bit of program control determines whet... | 10/27/1987 |
| 4699754 | Jet pump-drive system for heat removal The invention does away with the necessity of moving parts such as a check valve in a nuclear reactor cooling system. Instead, a jet pump, in combination with a TEMP, is employed to assure safe cooling of a nuclear reactor after shutdown. A main flow exis... | 10/13/1987 |
| 4698518 | Magnetically switched power supply system for lasers A laser power supply system is described in which separate pulses are utilized to avalanche ionize the gas within the laser and then produce a sustained discharge to cause the gas to emit light energy. A pulsed voltage source is used to charge a storage d... | 10/06/1987 |
| 4697425 | Oxygen chemisorption cryogenic refrigerator A chemisorption refrigeration system includes dual containers containing a material such as silver which is alternately heated and cooled to chemically desorb and reabsorb oxygen gas. The gas is desorbed at high temperature and pressure and is pre-cooled ... | 10/06/1987 |
| 4698028 | Coaxial cable connector A coaxial cable connector is provided, which resists radio-frequency breakdown in coaxial cables used in the vacuum of outer space. The connector body surrounds an insulator which includes an easily compressible elastomeric portion. An insulated coaxial c... | 10/06/1987 |
| 4692674 | Brushless DC motor control system responsive to control signals generated by a computer or the like A control system for a brushless DC motor responsive to digital control signals is disclosed. The motor includes a multiphase wound stator and a permanent magnet rotor. The rotor is arranged so that each phase winding, when energized from a DC source, wil... | 09/08/1987 |
| 4684258 | Method and apparatus for enhancing laser absorption sensitivity A simple optomechanical method and apparatus is described for substantially reducing the amplitude of unwanted multiple-interference fringes which often limit the sensitivities of tunable laser absorption spectrometers. An exterior cavity is defined by pa... | 08/04/1987 |
| 4682053 | Method and means for generation of tunable laser sidebands in the far-infrared region A method is described for generating tunable far-infrared radiation. The apparatus includes a Schottky-barrier diode which has one side coupled through a conductor to a waveguide that carries a tunable microwave frequency, the diode having an opposite sid... | 07/21/1987 |
| 4677629 | Means for phase locking the outputs of a surface emitting laser diode array An array of diode lasers, either a two-dimensional array of surface emitting lasers, or a linear array of stripe lasers, is phase locked by a diode laser through a hologram which focuses the output of the diode laser into a set of distinct, spatially sepa... | 06/30/1987 |
| 4677636 | Multiplex electric discharge gas laser system A multiple pulse electric discharge gas laser system is described in which a plurality of pulsed electric discharge gas lasers are supported in a common housing. Each laser is supplied with excitation pulses from a separate power supply. A controller, whi... | 06/30/1987 |
| 4675880 | Antimultipath communication by injecting tone into null in signal spectrum A transmitter for digital radio communication creates a null by balanced encoding of data modulated on an RF carrier, and inserts a calibration tone within the null. By having the calibration tone coincide in phase and frequency with the transmitted radio... | 06/23/1987 |
| 4675601 | Method of measuring field funneling and range straggling in semiconductor charge-collecting junctions Electric-field funneling length is measured while irradiating a semiconductor charge-collecting junction with electron-hole-pair generating charged particles at a first junction bias voltage. The bias voltage is then reduced to a second level in order to ... | 06/23/1987 |
| 4669882 | Laser pulse detection method and apparatus A sensor is described for detecting the difference in phase of a pair of returned light pulse components, such as the two components of a light pulse of an optical gyro. In an optic gyro, the two light components have passed in opposite directions through... | 06/02/1987 |
