Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 4868792 | Difar demultiplexer test circuit A demultiplexer test circuit having a signal source summing means responsive to a selected target angle theta for adding a first independent noise signal to an input signal to provide a composite omni signal and for adding a second noise signal to the pro... | 09/19/1989 |
| 4854664 | Multi-fiber optic cable connector and cable apparatus An apparatus for aligning and terminating at least one optical fiber of a fiber optic cable within the fiber optic connector assembly aong a predetermined axis. The fiber optic connector comprises a rigid tubular body having a bore dimensioned for receivi... | 08/08/1989 |
| 4835791 | Single sideband signal generator The method and apparatus disclosed for more efficient use of the bandwidth of a communication channel includes steps of generating a single sideband signal, including inputting a digital signal into an N-tap Hilbert transform filter, modulating the output... | 05/30/1989 |
| 4835721 | Frequency synthesizer A frequency synthesizer for use by an operator or other means for continuously generating an output noise signal, the frequency synthesizer comprises a digital means for directly synthesizing random noise having controlled spectral amplitudes. The synthes... | 05/30/1989 |
| 4830495 | Balanced dual servo VCO passive ring laser gyroscope A passive ring resonator gyroscope comprising a single piece body having an integral first and second resonator cavity. The first resonator cavity contains a single frequency laser means to provide a sharply tuned single frequency light source to the seco... | 05/16/1989 |
| 4828648 | Liquid phase epitaxy apparatus and method An apparatus and method for performing liquid phase epitaxy, mercury containment, substrate leveling, in situ annealing/doping and gas flushing in a liquid phase epitaxy growth of HgCdTe. The apparatus is a self contained unit comprising a transparent cov... | 05/09/1989 |
| 4823139 | Electronic countermeasure system A countermeasure method and apparatus for use by two mutually cooperating aircraft against a radar-homing anti-aircraft missile, and including the steps of transferring doppler shifted radar signals received at a respective one to the other of the two mut... | 04/18/1989 |
| 4815851 | Frequency modulated phase-locked stabilized passive ring laser gyro A passive ring resonator gyroscope having an integral single piece body having first and second resonator cavities. A laser uses the first resonator cavity. The laser has a first cavity adjusting means (PZT1) responsive to a first control signal for provi... | 03/28/1989 |
| 4811262 | Distributed arithmetic realization of second-order normal-form digital filter A high-speed distributed-arithmetic realization of a second-order normal-form digital filter includes a filter input, a filter output, and a memory. The memory has a first input, a second input, and a third input. The first memory input is connected to th... | 03/07/1989 |
| 4809209 | Mybrid charge-transfer-device filter structure A signal processor suitable for use as a discrete-time or sampled-data analog filter can be implemented by using only a few of the coefficient multipliers of a typical analog finite-impulse-response (FIR) filter, and expressing each coefficient multiplier... | 02/28/1989 |
| 4807999 | Two source passive ring laser gyroscope A two source passive ring resonator gyroscope having a single piece body with integral first, second and third resonator cavities. A first laser means uses the first resonator cavity to provide a first single frequency light source. A second laser uses th... | 02/28/1989 |
| 4803883 | Accelerometer An accelerometer comprising a frame having an input axis (y) and a cross axis (x) orthogonal to and co-planar with the input axis. The accelerometer has a flexible beam coupled to a proofmass. The beam is supported at a pivot location. A rotator coupled t... | 02/14/1989 |
| 4799259 | Monolithic random digital noise generator A random digital signal generator circuit responsive to a clock signal from a block signal source for outputting a sequential series of logic signals. The circuit comprises a clocked flip-flop that provides a signal at its output terminal that has a value... | 01/17/1989 |
| 4793908 | Multiple ion source method and apparatus for fabricating multilayer optical films A method of fabricating multiple layer, solid, thin films on a substrate having a surface to be coated, the method providing control over the thickness, stoichiometry, and morphology of each separate layer formed by a method comprising steps: A. forming a... | 12/27/1988 |
| 4788458 | Two wire interface circuit An interface circuit having a first reference terminal and a first input terminal for receiving a first input current signal, referenced to said first reference terminal from a first input current signal source. The circuit also has a second reference ter... | 11/29/1988 |
| 4774682 | Nonlinear statistical signal processor A signal processor is for receiving an input signal y. The input signal y has in it a signal x and has a conditional density function, given that the signal x is present, p(y|x). The signal processor includes a memory for storing the amplitude-density-fun... | 09/27/1988 |
| 4771173 | Contactless apparatus and method for thickness determination of coatings An apparatus and method for measuring the thickness of thin basal coatings on work pieces. The apparatus comprises a beta backscatter type measuring instrument including a work piece positioning system to permit the precise positioning of a coated work pi... | 09/13/1988 |
| 4768391 | Actuator load simulator An apparatus and method for the testing and evaluation of numerous actuators having different load characteristics. The apparatus comprises a fixed frame, having a first and second lever arms pivotally attached to the fixed frame. An expandable, contracti... | 09/06/1988 |
| 4763023 | Clocked CMOS bus precharge circuit having level sensing A circuit for charging a capacitive load such as a data or address bus in a VLSI circuit includes a voltage source input, a PFET switch connected between the voltage source input and the capacitive load or bus, and a voltage regulator connected to the cap... | 08/09/1988 |
| 4763128 | Electronic countermeasure technique Electronic countermeasure technique for protecting low-flying aircraft from radiant energy guided missiles by bouncing a decoy guidance signal off the ground near the aircraft.... | 08/09/1988 |
| 4755364 | Liquid phase epitaxy apparatus and method An apparatus and method for performing liquid phase epitaxy, mercury containment, substrate leveling, in situ annealing/doping and gas flushing in a liquid phase epitaxy growth of HgCdTe. The apparatus is a self contained unit comprising a transparent cov... | 07/05/1988 |
| 4749662 | Diffused field CMOS-bulk process The present invention is a CMOS process for forming an N-channel device and a P-channel device on a doped substrate wherein an active region surrounded by field for the N-channel device is delineated to comprise a thin layer of oxide, a layer of nitride a... | 06/07/1988 |
| 4740883 | Universal solid state power controller A universal solid state power controller for controlling the application of a source voltage to a load comprising a semiconductor switch having a predetermined non-bounce switching characteristic. The switch is responsive to an operating signal for connec... | 04/26/1988 |
| 4740414 | Ceramic/organic multilayer interconnection board A multilayer board comprising a novel construction of ceramic and organic layers to reduce difficulties commonly encountered by board materials and components attached thereto having differing thermal coefficients of expansion. The multilayer board compri... | 04/26/1988 |
| 4739205 | Telephone signal multiplexing system A communications system includes self synchronizing device sets such as telephones that are interconnected by wiring to allow communication between the devices and communication with an outside communication line, such as a subscriber telephone line provi... | 04/19/1988 |
| 4709141 | Non-destructive testing of cooled detector arrays An apparatus for testing an array of infrared detectors includes a number of optical switches, each of which is individually addressable with light to change its electrical characteristics. Each of the optical switches has a first side and a second side. ... | 11/24/1987 |
| 4709160 | Solid state dc power switch A dc power switch responsive to an input signal referenced to a signal reference terminal and having a power input terminal connected to a dc voltage source and a power output terminal connected to a load. The dc switch has an isolated voltage source refe... | 11/24/1987 |
| 4709315 | Isolated controller circuit An isolated controller circuit responsive to an input signal voltage from the output of a low-pass filter referenced to an isolated reference potential; the controller circuit being characterized to provide a control signal at a signal output terminal ref... | 11/24/1987 |
| 4707808 | Small size, high speed GaAs data latch The invention provides small size, high speed data latches comprising memory cells that are fabricated according to a Gallium Arsenide (GaAs) process. The memory cells are implemented by a relatively few number of depletion metal semiconductor field effec... | 11/17/1987 |
| 4706220 | Non-volatile RAM cell with dual high voltage precharge A non-volatile memory cell circuit for storing and recalling a digital signal, the memory cell circuit having a store cycle having a repeating series of recurring store cycle sequences; each store cycle sequence being controlled by an HIV Signal and a STO... | 11/10/1987 |
| 4705962 | Solid state dc rate of rise controlled switch A solid state dc switch for switching power from the positive terminal of a ground referenced dc voltage source to the terminal of a ground referenced load. The solid state switch has a divide-by-two circuit means responsive to a clock signal and to a con... | 11/10/1987 |
| 4706244 | Frequency multiplexed telephone system A frequency multiplexed system for coupling a plurality of individual telephone sets to at least one subscriber telephone line. The system includes a line adapter unit for controlling use of subscriber lines and for assigning the use of frequency bands to... | 11/10/1987 |
| 4703205 | Uncompensated and compensated gallium arsenide input receivers A gallium arsenide input receiver and method modify a conventional voltage level shifter circuit at its input to adapt it to operate on the lower gallium arsenide input voltages. A gallium arsenide depletion common gate amplifier FET receives the lower ra... | 10/27/1987 |
| 4697328 | Method of making hardened NMOS sub-micron field effect transistors The invention provides a novel high speed hardened NMOS structure and process for developing the structure. In a first embodiment, the surface of the silicon wafer is preserved intact by building the field oxide above this surface so there is no tra... | 10/06/1987 |
| 4694565 | Method of making hardened CMOS sub-micron field effect transistors The invention provides a novel high speed hardened CMOS structure and process for developing the structure. In a first embodiment, the surface of the silicon wafer is preserved intact by building the field oxide above this surface so there is no tra... | 09/22/1987 |
| 4694267 | Waveguide dehydrator apparatus Dessicant vessel allows air to flow through desiccant from a temperature related pumping phenomena prior to entry into waveguide to guard against attenuation of microwave signal.... | 09/15/1987 |
| 4688835 | Adjustable latching apparatus and method of latchably pressing and holding together A latching apparatus and method for adjustably pressing and holding together two members, in either an abutting or controlled gap relationship with respect to each member. The apparatus comprises a handle and opposite end which is cam shaped. A shaft is p... | 08/25/1987 |
| 4686652 | Non-volatile RAM cell with single high voltage precharge A memory cell circuit for storing the state of a digital signal on a data bus in response to an address signal. The memory cell has a store cycle with a repeating series of recurring store cycle sequences, each store cycle sequence having a (HIV) high-vol... | 08/11/1987 |
| 4685085 | Non-volatile ram cell with charge pumps A random access memory cell includes a volatile RAM cell, a non-volatile RAM cell and a transfer control circuit connected between the volatile and non-volatile elements. The volatile element includes two nodes and has two stable states. The non-volatile ... | 08/04/1987 |
| 4683399 | Silicon vacuum electron devices A vacuum electron device including a semiconductor device in a hermetically sealed container enclosing a vacuum. The device includes an electron emissive source for emitting electrons into the vacuum, and a collector for collecting electrons emitted from ... | 07/28/1987 |
