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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 4774126 | Solderable thermoplastic structure A low cost thermoplastic material having a low heat distortion (HDT) thermoplastic material forms the main structural component of a structural member. A relatively high cost high HDT thermoplastic material is attached to the low cost main structural comp... | 09/27/1988 |
| 4725567 | Composite by infiltration A composite is produced by shaping a ceramic filler into a porous compact and infiltrating the compact with liquid alkaline earth silicate or alkaline earth aluminosilicate.... | 02/16/1988 |
| 4656447 | Superconducting filter coils for high homogeneity magnetic field When a closed circuit is formed by joining superconducting wires with superconducting joints, the current in that circuit adjusts itself as required to maintain whatever total flux linkage the circuit had at the instant superconductivity was achieved. In ... | 04/07/1987 |
| 4618924 | Automatic machining using constructive solid geometry with Boolean combinations of primitives including tool offsets to form a machining pattern Constructive solid geometry is a technique of representing parts by adding and subtracting a set of primitive shapes. Automatic tool paths to machine a part with a rotating cutter are generated by taking the constructive solid geometric description of the... | 10/21/1986 |
| 4529809 | Method for production of aryl substituted esters A method for producing high yields of aryl substituted esters of the formula ##STR1## by reacting sterically hindered phenols with a stoichiometric excess of an olefinic ester in the presence of a base catalyst at a temperature in the range of 1... | 07/16/1985 |
| 4523998 | Continuous ion exchange process using thermally regenerable liquid ion exchangers Advantage is taken of the thermal dependency of the direction of certain reactions involving liquid ion exchange materials to provide a continuous process for removal of mineral ion species from aqueous streams. The process is particularly applicable to w... | 06/18/1985 |
| 4522771 | Method of fabricating layer insulation for use in high-voltage electrical equipment A method of fabricating a layer insulation for use in high voltage electrical equipment by applying a mixture of inorganic particles, inorganic cement, and a fluid carrier vehicle for the cement to an intermingled array of inorganic fibers.... | 06/11/1985 |
| 4518545 | Method for sintering high density yttria-gadolinia ceramic scintillators A method for preparing high density yttria-gadolinia ceramic scintillators by cold-pressing multicomponent powder to form powder compacts and then sintering the compacts to form transparent-to-translucent ceramic scintillator bodies. The powder compacts a... | 05/21/1985 |
| 4506247 | Axisymmetric correction coil system for NMR magnets Even and odd pairs of axisymmetric correction coils are disposed on a cylindrical form at specified longitudinal positions. The coil pairs are intended to provide correction fields for high strength magnets employed in NMR imaging applications. The locati... | 03/19/1985 |
| 4500413 | Sintered ceramic article with porous region A sintered metallic oxide article is disclosed comprising a non-porous body having at least one porous region formed therein in the general shape of a hollow cylinder, said region placing opposite sides of the body in flow communication. A method is set f... | 02/19/1985 |
| 4334165 | Copper-steel composite commutator bar An electrical commutator having a plurality of spaced apart commutator bars is disclosed. The commutator bars are formed from a composite of an electrically conductive copper portion bonded, for example by brazing or electron beam welding, at an interface... | 06/08/1982 |
| 4329727 | Directional power distance relay A system for rapidly detecting short circuits on power transmission lines in electrical power systems is provided to protect the power network from the effects of short circuits within the system. The instant invention provides a system for detecting mult... | 05/11/1982 |
| 4323668 | (Ortho-alkoxycarbonyaryl)-carbonate transesterification A polycarbonate transesterification process comprising reacting (ortho-alkoxycarbonylaryl)carbonates and dihydric phenol under transesterification reaction conditions.... | 04/06/1982 |
| 4316242 | Wide input range, transient-immune regulated flyback switching power supply A low cost switching mode power supply particularly adapted for use in an electric vehicle is characterized by an extreme input voltage range, immunity to high input voltage transients, and stable operation. A negative voltage feedback arrangement applied... | 02/16/1982 |
| 4316185 | Battery monitor circuit A battery monitor circuit for rechargeable multicell batteries that provides a reliable indication of battery failure independent of temperature, load and age, by continuously comparing the impedance of the cells of the battery against each other. Compari... | 02/16/1982 |
| 4313257 | Annealing methods for improving performance of a radiation sensor A scintillation member, such as of thallium-doped cesium iodide and the like, is used with a photodetector to form a radiation-responsive sensor. The scintillation member is annealed, by heating followed by slow cooling, to decrease the hysteresis respons... | 02/02/1982 |
| 4311922 | Variable excitation circuit An excitation circuit is disclosed which is responsive to a trigger signal to drive a capacitive load with a controllable high frequency pulse burst. The pulse burst takes the form of a multiple cycle output signal which has a selectively variable high vo... | 01/19/1982 |
| 4310896 | Method of interfacing remote units to a central microprocessor A method for interfacing two remote electronic units uses four lines and a handshaking routine including the steps of: causing the first unit to simultaneously transmit a strobe signal on one of the four lines and a signal representing one bit of the info... | 01/12/1982 |
| 4310837 | Electrical device termination high temperature indicator Temperature indicating apparatus for sensing overheating at a pair of terminals on an electrical power line comprises a neon gas-filled glow tube and a thermistor electrically coupled in series across the terminals, with a resistor electrically coupled in... | 01/12/1982 |
| 4310805 | Phase-locked loop stabilized by a crystal oscillator A phase-locked loop circuit, having an oscillator controlled by a voltage related to the phase difference between a reference signal and a loop signal, is stabilized by a crystal oscillator. The voltage controlled oscillator signal is frequency-subtracted... | 01/12/1982 |
| 4308619 | Apparatus and methods for synchronizing a digital receiver Apparatus for synchronizing the bit clock in a digital receiver to be in phase with bits of a received data stream, utilizes a frequency source locked to a system-wide frequency and frequency-arithmetic means for providing first and second local frequenci... | 12/29/1981 |
| 4308164 | Novel yellow azo dyes and dichroic liquid crystal composition made therewith Novel yellow azo dye compositions and a liquid crystal composition containing the yellow azo dye composition are disclosed. The yellow azo dye composition, having terminal ester groups has the general formula: ##STR1## wherein R and R' are acyl group... | 12/29/1981 |
| 4308163 | Novel yellow azo dyes and dichroic liquid crystal composition made therewith Novel yellow azo dye compositions and a liquid crystal composition containing the yellow azo dye composition are disclosed. The yellow azo dye composition, having terminal ester groups has the general formula: ##STR1## wherein R and R' are acyl group... | 12/29/1981 |
| 4308162 | Novel yellow azo dyes and dichroic liquid crystal compositions made therewith Novel yellow azo dye compositions and novel liquid crystal compositions containing the yellow azo dye composition. The yellow azo dye composition, having terminal ester groups, has the general formula: ##STR1## wherein R and R' are alkyl or substitut... | 12/29/1981 |
| 4308161 | Novel yellow azo dyes and dichroic liquid crystal compositions made therewith Novel yellow azo dye compositions and a liquid crystal composition containing the yellow azo dye composition are disclosed. The yellow azo dye composition, having terminal ester groups, has the general formula: ##STR1## wherein R and R' are acyl grou... | 12/29/1981 |
| 4307464 | Method and apparatus for synthesizing a modulated carrier to reduced interchannel interference in a digital communication system The modulated carrier in a frequency-multiplexed digital communications system is synthesized with each band of the modulated carrier derived from data stored in a read-only-memory. The carrier envelope shape is selected to reduce the sidebands of the dig... | 12/22/1981 |
| 4307343 | Moving gradient zeugmatography Nuclear magnetic resonance phenomena are employed to generate a two dimensional image of a thin planar slice through a body under investigation. The apparatus herein operates to determine the spin density distribution in a planar slab within the body whic... | 12/22/1981 |
| 4306148 | Tactile sensor A tactile area sensor for robots has an array of pneumatic flow passages. The air flow in each passage is dependent on a localized force exerted by an object pressing against an elastic pad on the face of the sensor. The air flow impinges on a metallic ta... | 12/15/1981 |
| 4301509 | Method for cooking meat or poultry in thermal oven Meat or poultry is cooked automatically in a thermal oven to a desired degree of doneness by a chosen time. The temperature of the meat or poultry is monitored, and linear extrapolations are made therefrom. These extrapolations are compared to the course ... | 11/17/1981 |
| 4301347 | Feed system for microwave oven The heating uniformity of a microwave oven is significantly improved by a feed that radiates rotating elliptically polarized electromagnetic waves. A pair of crossed slots in the feed rectangular waveguide has directional characteristics and radiates ener... | 11/17/1981 |
| 4300392 | Interchangeable networks with non-linear sensors and method of producing such networks Highly linearized and interchangeable networks, each having at least one non-linear resistive element for sensing the magnitude of a physical parameter, such as a thermistor for measuring temperature, have a specified network resistance at a particular va... | 11/17/1981 |
| 4300126 | Method and apparatus, for power line communications using zero crossing load interruption In a system for communicating information over a power line network, connection of power loads is interrupted in the vicinity of zero crossings of the A.C. power line waveform to provide a high impedance condition during which the transmitters and receive... | 11/10/1981 |
| 4298789 | Oven having a cavity heated by at least one monolithic integrated heat source A cavity, such as an oven cavity, is heated by at least one monolithic integrated heat source, each fabricated by depositing a layer of resistive material on a substrate of non-conducting, or insulating, material. A pair of spaced-apart conductive element... | 11/03/1981 |
| 4298986 | Receiver for phase-shift modulated carrier signals A receiver for recovering digital data from a phase-shift-modulated carrier in a data communications system, utilizes a relatively wide band-pass filter providing the received modulated signal to a pair of phase-locked loops. The first phase-locked loop p... | 11/03/1981 |
| 4296632 | Temperature-to-frequency conversion apparatus A temperature-to-frequency converter circuit of the type utilizing a pair of threshold switches connected across a timing capacitor for controlling a circuit output voltage to higher and lower magnitudes when the capacitor voltage respectively reaches hig... | 10/27/1981 |
| 4296449 | Relay switching apparatus A switching circuit for selectively coupling a load to an A.C. power source is disclosed. The switching circuit includes a diode-commutated master relay contact and a pilot relay contact coupled in series therewith. The master and pilot relay contacts are... | 10/20/1981 |
| 4296413 | Resistance-bridge to frequency converter with automatic offset correction A circuit for converting changes in a sensed physical parameter, such as resistance and resistance change as a function of pressure, temperature and the like, into a digital signal of proportional frequency. A sensor bridge, monitoring the parameter to be... | 10/20/1981 |
| 4296335 | High voltage standoff MOS driver circuitry MOS circuitry conducting constant current at high voltage comprises first, second and third depletion mode MOSFETs connected in a loop, with their gates joined at the junction of the second and third MOSFETs. A control circuit is coupled to the junction o... | 10/20/1981 |
| 4296296 | Controllable-duty-cycle power supply for microwave oven magnetron and the like A power supply for controlling the duty-cycle of a microwave oven magnetron and the like power-energizing load, includes a parallel combination of a non-linear resistance element, such as a varistor and the like, and a gateable semiconductor switching dev... | 10/20/1981 |
| 4291314 | Transverse magnetic printing head A high resolution magnetic printing head possesses a comb-like magnetically permeable member formed by electrodeposition. A magnetic printing head comprising a substrate with an elongated gap across which conductive lines pass is formed by electrodepositi... | 09/22/1981 |
