Chafin; James H. - US Patent Attorneys and Agents

Attorney: Chafin; James H.

Number of patents: 112
Last date: September 26, 1989

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Number	Title	Issue Date
4869625	Combination drilling and skiving tool A combination drilling and skiving tool including a longitudinally extending hollow skiving sleeve slidably and concentrically mounted on a right-handed twist drill. Dogs or pawls provided on the internal periphery of the skiving sleeve engage with the he...	09/26/1989
4868072	Liquid metal thermal electric converter A liquid metal thermal electric converter which converts heat energy to electrical energy. The design of the liquid metal thermal electric converter incorporates a unique configuration which directs the metal fluid pressure to the outside of the tube whic...	09/19/1989
4866498	Integrated circuit with dissipative layer for photogenerated carriers The sensitivity of an integrated circuit to single-event upsets is decreased by providing a dissi The U.S. Government has rights in this invention pursuant to Contract No. DE-ACO4-76DP00789 between the Department of Energy and AT&T Technologies, Inc....	09/12/1989
4866147	Soluble silylated polyacetylene derivatives and their use as percursors to novel polyacetylene-type polymers Polymerization of acetylenic monomers is achieved by using a catalyst which is the reaction product of a tungsten compound and a reducing agent effective to reduce W(VI) to W(III and/or IV), e.g., WCl6.(organo-Li, organo-Mg or polysilane). The ...	09/12/1989
4861408	Modification of polymeric surface for improved adhesion via electron beam exposure Treating polymer surfaces, e.g., Teflon, particularly very thin surfaces, e.g., 50-10,000 Å with low energy electron radiation, e.g., 100-1000 eV, in a high vacuum environment, e.g., less than 10-6 Torr, to enhance the ability of the surface t...	08/29/1989
4859054	Proximity fuze A proximity fuze system includes an optical ranging apparatus, a detonation circuit controlled by the optical ranging apparatus, and an explosive charge detonated by the detonation cirtcuit. The optical ranging apparatus includes a pulsed laser light sour...	08/22/1989
4858529	Spark-safe low-voltage detonator A column of explosive in a low-voltage detonator which makes it spark-safe ncludes an organic secondary explosive charge of HMX in the form of a thin pad disposed in a bore of a housing of the detonator in an ignition region of the explosive column and adj...	08/22/1989
4843964	Smart explosive igniter A non electrically conductive substrate includes both an SCB and a semiconductor switch, the switch being electrically connected to cause the SCB to fire when the switch is triggered....	07/04/1989
4841778	Optical fiber sensor technique for strain measurement Laser light from a common source is split and conveyed through two similar optical fibers and emitted at their respective ends to form an interference pattern, one of the optical fibers having a portion thereof subjected to a strain. Changes in the strain...	06/27/1989
4841570	One-way transformation of information Method and apparatus are provided for one-way transformation of data according to multiplication and/or exponentiation modulo a prime number. An implementation of the invention permits the one way residue transformation, useful in encryption and similar a...	06/20/1989
4841550	Universal null DTE A communication device in the form of data terminal equipment permits two data communication equipments, each having its own master clock and operating at substantially the same nominal clock rate, to communicate with each other in a multi-segment circuit...	06/20/1989
4839339	Superconductor precursor mixtures made by precipitation method Method and apparatus for preparing highly pure homogeneous precursor powder mixtures for metal oxide superconductive ceramics. The mixes are prepared by instantaneous precipitation from stoichiometric solutions of metal salts such as nitrates at controlle...	06/13/1989
4838989	Laser-driven fusion etching process The surfaces of solid ionic substrates are etched by a radiation-driven chemical reaction. The process involves exposing an ionic substrate coated with a layer of a reactant material on its surface to radiation, e.g. a laser, to induce localized melting o...	06/13/1989
4838644	Position, rotation, and intensity invariant recognizing method A method for recognizing the presence of a particular target in a field of view which is target position, rotation, and intensity invariant includes the preparing of a target-specific invariant filter from a combination of all eigen-modes of a pattern of ...	06/13/1989
4837442	Neutron range spectrometer A neutron range spectrometer and method for determining the neutron energy spectrum of a neutron emitting source are disclosed. Neutrons from the source are collimnated along a collimation axis and a position sensitive neutron counter is disposed in the p...	06/06/1989
4833404	Test probe for surface mounted leadless chip carrier A test probe for a surface mounted leadless chip carrier is disclosed. The probed includes specially designed connector pins which allow size reductions in the probe. A thermoplastic housing provides spring action to ensure good mechanical and electrical ...	05/23/1989
4832881	Low density microcellular carbon foams and method of preparation A low density, open-celled microcellular carbon foam is disclosed which is prepared by dissolving a carbonizable polymer or copolymer in a solvent, pouring the solution into a mold, cooling the solution, removing the solvent, and then carbonizing the poly...	05/23/1989
4832870	Electrically conductive composite material An electrically conductive composite material is disclosed which comprises a conductive open-celled, low density, microcellular carbon foam filled with a non-conductive polymer or resin. The composite material is prepared in a two-step process consisting ...	05/23/1989
4829020	Substrate solder barriers for semiconductor epilayer growth During the growth of compound semiconductors by epitaxial processes, substrates are typically mounted to a support. In modular beam epitaxy, mounting is done using indium as a solder. This method has two drawbacks: the indium reacts with the substrate, an...	05/09/1989
4822207	Anti-terrorist vehicle crash impact energy absorbing barrier An anti-terrorist vehicle crash barrier includes side support structures, crushable energy absorbing aluminum honeycomb modules, and an elongated impact-resistant beam extending between, and at its opposite ends through vertical guideways defined by, the ...	04/18/1989
4821584	Piezoelectric film load cell robot collision detector A piezoelectric load cell which can be utilized for detecting collisions and obstruction of a robot arm end effector includes a force sensing element of metallized polyvinylidene fluoride (PVDF) film. The piezoelectric film sensing element and a resilient...	04/18/1989
4820925	Room air monitor for radioactive aerosols A housing assembly for use with a room air monitor for simultaneous collection and counting of suspended particles includes a casing containing a combination detector-preamplifier system at one end, a filter system at the other end, and an air flow system...	04/11/1989
4820226	Getter pump for hydrogen and hydrocarbon gases A gettering device for hydrogen isotopes and gaseous hydrocarbons based on the interaction of a plasma and graphite used as cathodic material. The plasma is maintained at a current density within the range of about 1 to about 1000 mA/cm2. The g...	04/11/1989
4817494	Magnetic reconnection launcher An electromagnetic launcher includes a plurality of electrical stages which are energized sequentially in synchrony with the passage of a projectile. Each stage of the launcher includes two or more coils which are arranged coaxially on either closed-loop ...	04/04/1989
4814768	Downhole pulse radar A borehole logging tool generates a fast rise-time, short duration, high peak-power radar pulse having broad energy distribution between 30 MHz and 300 MHz through a directional transmitting and receiving antennas having barium titanate in the electromagn...	03/21/1989
4812715	Current-level triggered plasma-opening switch An opening switch for very high power electrical pulses uses a slow magnetic field to confine a plasma across a gap between two electrodes. The plasma conducts the electric pulse across the gap while the switch is closed. A magnetic field generated by the...	03/14/1989
4812520	Method for the preparation of novel polyacetylene-type polymers Polymerization of acetylenic monomers is achieved by using a catalyst which is the reaction product of a tungsten compound and a reducing agent effective to reduce W(VI) to W(III) and/or IV), e.g., WCl6.(organo-Li, organo-Mg or polysilane). The...	03/14/1989
4812210	Measuring surfactant concentration in plating solutions An arrangement for measuring the concentration of surfactants in a electrolyte containing metal ions includes applying a DC bias voltage and a modulated voltage to a counter electrode. The phase angle between the modulated voltage and the current response...	03/14/1989
4809226	Random access memory immune to single event upset using a T-resistor In a random access memory cell, a resistance "T" decoupling network in each leg of the cell reduces random errors caused by the interaction of energetic ions with the semiconductor material forming the cell. The cell comprises two parallel legs each conta...	02/28/1989
4808368	High voltage supply for neutron tubes in well logging applications A high voltage supply is provided for a neutron tube used in well logging. The "biased pulse" supply of the invention combines DC and "full pulse" techniques and produces a target voltage comprising a substantial negative DC bias component on which is sup...	02/28/1989
4806384	Process for forming exoergic structures with the use of a plasma A method of forming exoergic structures, as well as exoergic structures produced by the method, is provided. The method comprises the steps of passing a plasma-forming gas through a plasma spray gun, forming a plasma spray, introducing exoergic material i...	02/21/1989
4805318	Acoustically enhanced heat exchange and drying apparatus A heat transfer apparatus includes a first chamber having a first heat transfer gas inlet, a second heat transfer gas inlet, and an outlet. A first heat transfer gas source provides a first gas flow to the first chamber through the first heat transfer gas...	02/21/1989
4801469	Process for obtaining multiple sheet resistances for thin film hybrid microcircuit resistors A standard thin film circuit containing Ta2 N (100 ohms/square) resirs is fabricated by depositing on a dielectric substrate successive layers of Ta2 N, Ti and Pd, with a gold layer to provide conductors. The addition of a few simpl...	01/31/1989
4797716	Field-effect transistor having a superlattice channel and high carrier velocities at high applied fields A field effect transistor comprises a semiconductor having a source, a drain, a channel and a gate in operational relationship. The semiconductor is a strained layer superlattice comprising alternating quantum well and barrier layers, the quantum well lay...	01/10/1989
4796198	Method for laser-based two-dimensional navigation system in a structured environment A low power, narrow laser beam, generated by a laser carried by a mobile vehicle, is rotated about a vertical reference axis as the vehicle navigates within a structured environment. At least three stationary retroreflector elements are located at known p...	01/03/1989
4794230	Low-pressure water-cooled inductively coupled plasma torch An inductively coupled plasma torch is provided which comprises an inner tube, including a sample injection port to which the sample to be tested is supplied and comprising an enlarged central portion in which the plasma flame is confined; an outer tube s...	12/27/1988
4793745	Double diameter boring tool A boring tool and a method of operation are provided for boring two concentric holes of precision diameters and depths in a single operation. The boring tool includes an elongated tool body, a shank for attachment to a standard adjustable boring head whic...	12/27/1988
4791633	Polarization feedback laser stabilization A system for locking two Nd:YAG laser oscillators includes an optical path for feeding the output of one laser into the other with different polarizations. Elliptical polarization is incorporated into the optical path so that the change in polarization th...	12/13/1988
4789219	Gradient index retroreflector A retroreflector is formed of a graded index lens with a reflective coating at one end. The lens has a length of an odd multiple of a quarter period thereof. Hexagonally shaped graded index lenses may be closely packed in an array to form a retroreflectin...	12/06/1988
4785261	Magnetically insulated transmission line oscillator A magnetically insulated transmission line oscillator employs self-generated magnetic fields to generate microwave energy. An anode of the oscillator includes slow-wave structures which are formed of a plurality of thin conductive vanes defining cavities ...	11/15/1988

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Attorney: Chafin; James H.