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| Number | Title | Issue Date |
| 4869097 | Sonic gas pressure gauge A method and an apparatus are provided for measuring the pressure of a gas within a sealed vessel. A sonic transducer is used to apply an oscillating force to the surface of the vessel. The frequency of the ultrasonic wave is swept through a range which c... | 09/26/1989 |
| 4862384 | Method of measuring the dynamic viscosity of a viscous fluid utilizing acoustic transducer The dynamic viscosity of a viscous medium is measured by positioning an acoustic transducer in the temperature and pressure environment of the medium and spaced from the medium, then measuring a first resonant frequency and bandwidth for acoustic shear wa... | 08/29/1989 |
| 4847044 | Method of fabricating a metal aluminide composite A softer metal such as aluminum, or a metal forming a metal aluminide, or an alloy containing these metals is added to a metal aluminide composite during fabrication to promote easy consolidation of the metal aluminide matrix with the reinforcing phase. T... | 07/11/1989 |
| 4833042 | Nonalloyed ohmic contacts for n type gallium arsenide The invention is a layered nonalloyed ohmic contact structure for use on n type gallium arsenide including a layer of germanium or silicon of the order of 10 Å thick evaporated onto the gallium arsenide; a diffusion barrier layer of material 100-200 Å t... | 05/23/1989 |
| 4826267 | Spectral filter with integral antireflection coating A gradient index filter can be fabricated with integral antireflection properties without degrading the inband performance of the filter. The filter is for placement between an incident medium and a substrate to reflect incident electromagnetic energy hav... | 05/02/1989 |
| 4814259 | Laser generated electrically conductive pattern A conductive or semiconductive pattern of a metal sulfide or selenide such as copper, cadmium, cobalt or nickel sulfide, is provided on a substrate. The pattern may have a resistivity in the range of 1 to 106 ohms per square. It is formed by co... | 03/21/1989 |
| 4807008 | Static memory cell using a heterostructure complementary transistor switch A heterostructure complementary transistor switch (HCTS) is fabricated using epitaxial layers on a substrate to form the desired P-N-P-N (or N-P-N-P) complementary structure in III-V compound semiconductor materials. Two HCTS are formed on a single substr... | 02/21/1989 |
| 4799974 | Method of forming a fine grain structure on the surface of an aluminum alloy An aluminum alloy is provided which has a surface with a fine grain structure. It is produced by overaging an aluminum alloy and then cold working only the surface by shot peening or other surface working technique. The alloy is then heated so that the ov... | 01/24/1989 |
| 4785457 | Heterostructure semiconductor laser The crystallographic plane-dependent, amphoteric nature of Si-doped AlGaAs is used to provide a low threshold semiconductor laser. An active layer of AlGaAs is sandwiched between an injection layer and a current confining layer of AlGaAs. The injection la... | 11/15/1988 |
| 4779452 | High temperature ultrasonic viscometer An ultrasonic viscometer is described which is particularly designed for monitoring the viscosity of a thermally curing resin or composite, such as a fiber-reinforced epoxy composite, in an autoclave at high temperature. According to a preferred embodimen... | 10/25/1988 |
| 4778251 | Thickness error compensation for digital gradient-index optical coatings A method of fabricating an optical coating includes a layer pair, with a layer of a first optical material having a first refractive index and a first nominal thickness and a layer of a second optical material having a second refractive index and a second... | 10/18/1988 |
| 4775882 | Lateral bipolar transistor Silicon doping of GaAs provides n conductivity in {100} planes and p conductivity in {111} A planes. A split level of Si-doped GaAs utilizes this phenomena to provide a bipolar transistor. In one embodiment, the emitter is one level of the layer in the {1... | 10/04/1988 |
| 4770848 | Grain refinement and superplastic forming of an aluminum base alloy A rapidly-solidified aluminum alloy powder having a nominal composition of 7% Zn, 2.5% Mg, 2% Cu, 0.3% Zr, and 0.3% Cr is used to make a high forming-rate, superplastic, high-strength aluminum alloy. The powder is outgassed, consolidated, and extruded, th... | 09/13/1988 |
| 4767197 | Nonlinear optical matrix manipulation A nonlinear optical matrix multiplier includes a nonlinear optical medium with a first optical input beam impinging on the medium, the transverse spatial intensity of the first input beam being modulated by a first two dimensional matrix. A second optical... | 08/30/1988 |
| 4761059 | External beam combining of multiple lasers A coupled laser system includes a plurality of substantially parallel beams of coherent radiation with an output beam of coherent radiation at an oblique angle with respect to the plurality of beams. A photorefractive element is positioned to receive the ... | 08/02/1988 |
| 4759179 | Method for generating electronically excited NF for use in a laser Electronically excited nitrogen fluoride, NF*, is generated by dissociating fluoride azide, FN3. In a preferred embodiment, the FN3 is reacted with vibrationally excited molecules such as hydrogen halide, deuterium halide, carbon dio... | 07/26/1988 |
| 4756602 | Narrowband optical filter with partitioned cavity A method of designing a thin film optical bandpass filter, for transmitting light in a narrow band of wavelengths centered about a bandpass wavelength, begins by defining a first quarter-wave stack, including a first plurality of layers each having an opt... | 07/12/1988 |
| 4757210 | Edge illuminated detector arrays for determination of spectral content An edge illuminated optical detector array includes a series of two or more detectors which operate under an applied electric field. Each detector includes an extrinsic semiconducting active layer with a first conductivity type impurity concentration high... | 07/12/1988 |
| 4740386 | Method for depositing a ternary compound having a compositional profile Thermal sources of Te and of Hg are provided in a vacuum chamber to furnish constant effusion of Te and Hg. Laser radiation is used to evaporate a beam of CdTe from a target of CdTe in the chamber. The laser radiation is modulated to vary the beam intensi... | 04/26/1988 |
| 4733068 | Crossed fiber optic tactile sensor A fiber optic sensor array includes a row of transmitting optical fibers, with a column of detecting optical fibers overlapping the transmitting fibers. A planar compliant spacer separates the transmitting fibers from the detecting fibers, so that a senso... | 03/22/1988 |
| 4731340 | Dual lift-off self aligning process for making heterojunction bipolar transistors A dual lift-off technique is used to provide self-alignment of the emitter area, the emitter contact, and the base contact of a heterojunction, bipolar transistor. A photoresist pattern which defines an emitter adjacent a base contact is formed on a suita... | 03/15/1988 |
| 4731339 | Process for manufacturing metal-semiconductor field-effect transistors A single-level photoresist process is used to make metal-semiconductor field-effect transistors (MESFETs) having more uniform threshold voltages. An N- layer is formed in a semi-insulating semiconductor, followed by formation of a dummy gate u... | 03/15/1988 |
| 4727406 | Pre-multiplexed detector array Disclosed is a detector array for sensing electromagnetic radiation, which is based upon a semiconducting layer of a first conductivity type with an array of junction regions of a second conductivity type located in a major surface thereof. A first insula... | 02/23/1988 |
| 4722754 | Superplastically formable aluminum alloy and composite material Superplastically formable aluminum alloys and composite materials are prepared from rapidly solidified, coarse aluminum powder of a precipitation hardenable alloy, processed to have a low oxide and contaminant content. The powder is mixed, together with r... | 02/02/1988 |
| 4721537 | Method of producing a fine grain aluminum alloy using three axes deformation A method is provided for imparting a very fine grain size to aluminum alloys, including alloys in the form of sheet or heavy sections such as forging billets. The alloy is first aged to form precipitates. The aged alloy is then deformed along its three pr... | 01/26/1988 |
| 4718749 | Phase-conjugate interferometric coherent image subtraction A phase conjugate interferometer includes a source of coherent light and a first beam splitter for dividing the coherent light into a transmitted portion and a reflected portion. A second beam splitter is positioned to divide the transmitted portion into ... | 01/12/1988 |
| 4719635 | Frequency and phase locking method for laser array A system and method are described for establishing a common operating frequency and phase for the lasers in a two-dimensional array, each of which has an actual frequency which deviates from a common nominal frequency. A waveguide structure is placed in t... | 01/12/1988 |
| 4717606 | Method of fabricating a thin film electroluminescent display panel A thin film electroluminescent display panel is fabricated by using ion implantation at selected locations in a host layer. By this method, strips of electroluminescent material with different dopants can be created, and these different stripes can be add... | 01/05/1988 |
| 4707611 | Incremental monitoring of thin films The thickness t and refractive index n of an incremental thin film layer deposited on a base stack of layers are determined, where the characteristic matrix M of the base stack is ##EQU1## by directing light at a first wavelength toward the layer and... | 11/17/1987 |
| 4703992 | Laser beam cleanup by photorefractive two-way mixing An apparatus for compressing the spectral distribution of a coherent beam of light includes a narrowband filter for separating the coherent beam into a transmitted portion containing optical energy substantially limited to a single wavelength λ and a ref... | 11/03/1987 |
| 4701592 | Laser assisted deposition and annealing Disclosed is an apparatus for depositing a layer of a material on a substrate and annealing the deposited layer, including a Q-switched Nd: YAG laser for providing a coherent light output. An up collimator is situated in the path of the coherent light out... | 10/20/1987 |
| 4701422 | Method of adjusting threshold voltage subsequent to fabrication of transistor A method of adjusting the threshold voltages of field effect transistors fabricated on a III-V compound semi-insulating wafer includes the steps of measuring the threshold voltages of the transistor, directing an ion beam at the wafer to selectively damag... | 10/20/1987 |
| 4698417 | Production of oxy-metallo-organic polymer A process for producing novel oxy-metallo-organic, e.g. oxy-alkoxy, polymers is disclosed which comprises heating a metallo-organic compound, e.g. an alkoxide of a metal selected from the group consisting of aluminum, titanium and zirconium, and mixtures ... | 10/06/1987 |
| 4695619 | Intumescent flame-resistant coating composition A polymeric or plastic coating is provided which protects coated structures by forming an intumescent insulative fire resistant barrier. The coating is formed from the product of mixing an aromatic polyisocyanate, an aromatic polycarboxylic compound and a... | 09/22/1987 |
| 4692225 | Method of stabilizing conductive polymers A method of stabilizing electrically conductive polymers to hostile environments is disclosed. The method comprises encapsulating the conductive polymer, e.g., polypyrrole or polyaniline, as a powder, a free-standing film or preferably in the form of a co... | 09/08/1987 |
| 4687541 | Dual deposition single level lift-off process A dual deposition liftoff process is provided for obtaining clearly defined, planar integrated circuit pattern definition. After developing a photoresist pattern on a substrate, a thin layer of sealing material which is compatible with the integrated circ... | 08/18/1987 |
| 4681446 | Phase conjugate fiber gyroscope An optical fiber rotation sensor includes an optical fiber coil and a laser for providing a source of coherent light. A beam splitter divides the light source into a first beam and a second beam. The first beam is coupled into a first end of the coil, so ... | 07/21/1987 |
| 4680489 | Controllable piecewise linear gain circuit A controllable, piecewise linear gain circuit includes a first field effect transistor (FET), the drain of which is connected to a first source of bias voltage and the gate of which is connected to the input to the circuit. A first capacitor is connected ... | 07/14/1987 |
| 4675714 | Gapless gate charge coupled device Thin electrodes are coupled to a resistive film on an active semiconductive layer to form a gapless gate CCD (GGCCD). The active layer is formed ona semi-insulating substrate, and the resistive film is joined to the active layer by a Schottky barrier. The... | 06/23/1987 |
| 4670690 | Thin film electrolumenescent display panel An electroluminescent (EL) material is sandwiched between parallel strips of electrodes running at right angles to each other. Pixels are formed where the electrodes cross to provide a thin film, EL display. The display includes a layer of insulating mate... | 06/02/1987 |
