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| Number | Title | Issue Date |
| 4372996 | Method for metallizing aluminum pads of an integrated circuit chip A method including a novel bath is described for the nickeling of the aluminum pads of a chip, when either in die form or in wafer assembly. A near-neutral pH immersion zinc bath is used to cover the aluminum with zinc, which is followed by immersion in a... | 02/08/1983 |
| 4346781 | Lined-duct acoustic filter A lined duct is divided into two parallel branches by means of a rigid partition. The phase speed of the fundamental mode in each branch depends on the liner configuration and can differ markedly from the free-space phase speed. When the liners in the two... | 08/31/1982 |
| 4312915 | Cermet film selective black absorber A selective-black absorber capable of operation at elevated temperatures and high efficiency as a solar energy absorber is described. A cermet of MgO/Au, MgO/Pt, and Cr2 O3 /Cr having high solar energy absorptance and low infrared en... | 01/26/1982 |
| 4274737 | Test patterns for lens evaluation Lens testing charts using a vernier pattern, a sawtooth pattern, and a sinusoidally varying reflectance pattern are described and are used in conjunction with a lens under test to be focussed by said lens onto suitable high contrast film to provide an ima... | 06/23/1981 |
| 4271332 | Speech signal A/D converter using an instantaneously-variable bandwidth filter In a preferred embodiment of the invention the audio signal is bandwidth limited before being differentiated to provide either a positive or negative signal (depending on the slope of the audio signal) to a comparator which provides a corresponding logica... | 06/02/1981 |
| 4257690 | Eye testing chart An eye chart having a plurality of rows of letters where each letter is composed of a line-stroke having a plurality of adjoining black and white segments to provide an average reflectance which is the same as the reflectance of the gray background of the... | 03/24/1981 |
| 4254174 | Supported membrane composite structure and its method of manufacture A process for fabricating polyimide membrane x-ray lithography masks is described. Thin membrane of polyimide is formed by spinning polyamic acid on a glass substrate and polymerizing in situ. The glass substrate acts as a holder and efficient heat sink d... | 03/03/1981 |
| 4246617 | Digital system for changing the rate of recorded speech Representation of a speech signal by its short-time Fourier transform and the application of this representation to the problem of time compression and expansion of speech are presented. A time-frequency representation for linear time-varying systems is a... | 01/20/1981 |
| 4225233 | Rapid scan spectrophotometer A spectrometer capable of providing a predetermined wavelength of output light in accordance with a control voltage signal applied to a scanning element is described. The scanning element located at the grating image of the spectrometer is a small mirror ... | 09/30/1980 |
| 4223411 | Internal laryngeal prosthesis An internally worn laryngeal prosthesis for laryngectomized patients is described. The prosthesis is worn internally at the end of a surgically constructed fistula leading to the base of the patient's vocal tract. Exhaled air powers a miniature vibratory ... | 09/23/1980 |
| 4184131 | Electrical filter of cascaded surface acoustic wave resonators Surface acoustic wave resonators are used to provide band pass filters. The length of each resonator is related to the lumped constant inductor and capacitor values of the components of the low pass filter equivalent. This invention allows high frequency ... | 01/15/1980 |
| 4180935 | Hydrofoil trawl door A hydrodynamically superior trawl door with increased efficiency in harvesting fish and reducing fuel expenditures is composed of curved steel panels, which may be of constant radius to allow for economy in manufacturing. The door approximates an ideal hy... | 01/01/1980 |
| 4178701 | Cylindrical planetarium projector A planetarium projector and the method of making the projector is described wherein a light source is surrounded by an opaque enclosure having transparent spots or lines. The enclosure is fabricated from originally planar sheets of photographic film. The ... | 12/18/1979 |
| 4176329 | Tone control circuit A tone control circuit using only one potentiometer to provide bass or treble control is described. An integrator and a differentiator are connected to the input of the circuit and their outputs to the two ends of the potentiometer. Electrical connection ... | 11/27/1979 |
| 4170512 | Method of manufacture of a soft-X-ray mask A process for fabricating polyimide membrane x-ray lithography masks is described. Thin membrane of polyimide is formed by spinning polyamic acid on a glass substrate and polymerizing in situ. The glass substrate acts as a holder and efficient heat sink d... | 10/09/1979 |
| 4166669 | Planar optical waveguide, modulator, variable coupler and switch A planar semiconductor optical waveguide, modulator, variable coupler and switch are described. The waveguide has an epitaxial layer on a semiconductor substrate. Two spaced strips of opposite conductivity type are implanted in the layer to form an optica... | 09/04/1979 |
| 4150177 | Method for selectively nickeling a layer of polymerized polyester resin A method of selectively nickeling a layer of polymerized polyester resin is described. Patterns of electrically conducting nickel are produced on the resin surface by etching the surface of the resin prior to covering the etched surface with a patterned l... | 04/17/1979 |
| 4149616 | Deceleration controlled brake A deceleration controlled and limited brake incorporates a deceleration sensor to limit the amount of braking torque which can be manually applied to a disc type brake. The deceleration sensor is a weighted lever which responds to deceleration by tending ... | 04/17/1979 |
| 4142924 | Fast-sweep growth method for growing layers using liquid phase epitaxy A uniform and thin layer of a semiconductor is grown on a semiconductor substrate by an improved liquid phase epitaxy growth method. The growth solution is supercooled and is pushed rapidly over the substrate on which the layer of solute is grown. In GaAs... | 03/06/1979 |
| 4140369 | Efficient light diffuser A process for making a new type of diffuser is described wherein an electric field is applied to a liquid containing a suspension of transparent platelets having a refractive index higher than that of the fluid and a different dielectric constant. The fie... | 02/20/1979 |
| 4119300 | Bollard-hanger and coupler system A hanging bollard has a pivotally attached hanger which is capable of supporting a load by a line coupling device. A preferred form of the coupling device is spring loaded to allow detachment of the bollard cable from the load only when the coupler and lo... | 10/10/1978 |
| 4119509 | Method and apparatus for isotope separation from a gas stream This invention relates to a method and apparatus for isotope separation and in particular to separating the desired isotope from the gas in which it is contained by irradiating it with a laser and thereby selectively providing kinetic energy to the isotop... | 10/10/1978 |
| 4119855 | Non vacuum soft x-ray lithographic source A source of electrons or charged particles is contained in a baffled enclosure at less than atmospheric pressure. The source projects the electrons or charged particles to strike a target with a velocity which generates soft x-rays. The target is in a cha... | 10/10/1978 |
| 4117909 | Wheel torque feedback controlled front brake A torque controlled brake of the disc type has a caliper which is free to rotate about the axis of the wheel shaft. The caliper contains a rotatably mounted lever having disc pads which press upon the disc to provide the frictional braking force. The pads... | 10/03/1978 |
| 4115228 | Method of making secondary-electron emitters Thick, finely-grained films of cermets are fabricated using conventional techniques of sputtering the ceramic and the metal onto a substrate. The cermet is then subjected to differential sputtering in which the metal is sputtered away faster than the cera... | 09/19/1978 |
| 4113560 | Core catcher for nuclear reactor core meltdown containment A bed of graphite particles is placed beneath a nuclear reactor core outside the pressure vessel but within the containment building to catch the core debris in the event of failure of the emergency core cooling system. Spray cooling of the debris and gra... | 09/12/1978 |
| 4106588 | Mode canceling composite panel for greater than mass-law transmission loss in the principal speech bands A composite panel is described in which the face sheets and the core have properties such that the panel produces a double wall resonance near the low frequency end of the principal speech bands and in which the panel produces interaction between the symm... | 08/15/1978 |
| 4107544 | Two-photon resonant laser mixing in molecular liquids Liquid mixtures are used as the active medium in two-photon resonant four-wave mixing processes to achieve efficient nonlinear conversion of infrared laser frequencies. The resonant energy levels involved in these four-wave mixing processes are Raman-acti... | 08/15/1978 |
| 4075706 | Surface wave devices for processing signals A continuously programmable matched filter device using a piezoelectric substrate capable of propagating acoustic wave signals on a selected surface thereof and a semiconductor substrate mounted adjacent and spaced from such surface. Means are provided fo... | 02/21/1978 |
| 4069732 | Electric guitar An electric guitar is described which provides signals from each of its electrically conducting strings by the cutting of magnetic field lines. The magnetic fields are produced by removably mounted permanent magnets which produce concentrated fields. The ... | 01/24/1978 |
| 4069408 | Method and apparatus for underwater submerged arc welding According to the method and apparatus of this invention, water is kept away from the arc in underwater arc welding by means of material contained in a water-tight enclosure. The water-tight enclosure is formed by pressing the seal at the bottom of the enc... | 01/17/1978 |
| 4068214 | Asynchronous logic array An asynchronous logic array capable of directly implementing Petri net specification of digital systems is disclosed. The array can be used in general synthesis of asynchronous digital circuits and systems. The parallel nature of the array gives the reali... | 01/10/1978 |
| 4067037 | Transistor having high ft at low currents A transistor structure capable of high frequency operation with low collector currents is obtained by fabricating the transistor using nitride techniques to minimize the emitter area and base width area beyond that obtainable by conventional masking techn... | 01/03/1978 |
| 4060081 | Multilayer membrane useful as synthetic skin A multilayer membrane, which is useful as synthetic skin, is disclosed herein. A first layer is formed from a material which does not provoke an immune response and which is also insoluble and nondegradable in the presence of body fluids and/or body enzym... | 11/29/1977 |
| 4059982 | Apparatus for the measurement of thermal properties of biomaterials Appropriate heating and temperature sensing means are immersed in a medium the thermal conductivity, k, and thermal diffusivity, , of which are to be determined both in the presence of and in the absence of a flow of fluid therethrough. The method ... | 11/29/1977 |
| 4055758 | Surface wave devices for processing signals A continuously programmable matched filter device using a piezoelectric substrate capable of propagating acoustic wave signals on a selected surface thereof and a semiconductor substrate mounted adjacent and spaced from such surface. Means are provided fo... | 10/25/1977 |
| 4052208 | Image recording medium employing photoconductive granules and a heat disintegrable layer An image recording medium for recording incident radiation to provide a positive transparency is constructed of two electrically conductive composite layers containing photoconductive material between them. One of the conductive layers is opaque and the o... | 10/04/1977 |
| 4041297 | Real-time multiplier with selectable number of product digits A real-time multiplier capable of providing any desired number of the most significant product digits is described. The multiplier and multiplicand are provided concurrently to the multiplier as serial digital numbers. The least significant product digit ... | 08/09/1977 |
| 4039909 | Variable speed electronic motor and the like A variable speed electronic motor having wound polyphase armature and field windings each of which is energized by a polyphase source whose voltage and frequency are variable in a controlled fashion. Provision is made to control the excitation of the arma... | 08/02/1977 |
| 4038216 | Material and method of making secondary-electron emitters Thick, finely-grained films of cermets are fabricated using conventional techniques of sputtering the ceramic and the metal onto a substrate. The cermet is then subjected to differential sputtering in which the metal is sputtered away faster than the cera... | 07/26/1977 |
