Patents Examined by Gene Wan
  • Patent number: 6434174
    Abstract: A repetitively pulsed chemical oxygen-iodine laser having a resonant cavity containing a lasing medium in the form of a flowing mixture of excited oxygen and iodine atoms and an iodine absorption region within the resonant cavity. The iodine absorption region includes a source of iodine atoms and a magnetic field associated therewith. Selectively altering the magnetic field results in changing the absorption characteristics of the iodine atoms and therefore effectively pulses the output of the laser.
    Type: Grant
    Filed: October 7, 1985
    Date of Patent: August 13, 2002
    Assignee: United States of America as represented by the Secretary of the Air Force
    Inventors: Gordon D. Hager, Laverne A. Schlie, Robert D. Rathge, Robert F. Shea
  • Patent number: 4928070
    Abstract: A crossed-field amplifier circuit of the type using a CFA tube with a slow-wave structure for the anode and the cathode, each with an input and an output terminal, and a magnetic field in the axial direction, and signals of the same frequency from a common source and of controlled phase difference and amplitude applied to the input terminals of the anode and cathode slow-wave structures whose fringing fields interact with the electron cloud between the anode and the cathode to form well defined cloud fingers which result in amplification of the input signals to provide at the output terminal of the anode an amplified signal having lower random noise than hitherto available from CFA amplifiers.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: May 22, 1990
    Assignee: Raytheon Company
    Inventors: George H. MacMaster, Lawrence J. Nichols
  • Patent number: 4901991
    Abstract: The limited working region of a numerically controlled machine can be filled to maximum capacity with multiple strips of workpiece stock by providing one or more workpiece holding units each of which has opposed vertical walls between which two or more strips of workpiece stock may be disposed. An expansion device is actuated between the walls to generate outwardly directed forces against the walls and the two or more workpieces. The expansion device has a wedge that is elastically pushed between a plurality of laterally movable jaw pieces to force the jaw pieces apart.
    Type: Grant
    Filed: January 6, 1988
    Date of Patent: February 20, 1990
    Inventor: Ritchie G. Bonkowski
  • Patent number: 4897609
    Abstract: A tilt-angle gun provides a conically-shaped electron beam formed in a magnetically-shielded region which is injected into a coaxial waveguide of the amplifier embodiment of the invention and into a coaxial cavity of the oscillator embodiment immersed in the main magnetic focussing system to form a hollow gyro beam of large radius. RF power input and the amplified rf power output are simply and easily provided through circular input and output waveguides coupled respectively to each end of the coaxial waveguide by slotted sections. The electron beam and the output rf energy are naturally physically separated so that extraction of the rf output is facilitated and occurs with little rf power loss.
    Type: Grant
    Filed: December 28, 1987
    Date of Patent: January 30, 1990
    Assignee: Raytheon Company
    Inventor: Raghuveer Mallavarpu
  • Patent number: 4887048
    Abstract: A differential amplifier (10) having a circuit (18) which images or simulates the bias current flowing in an input stage (34) of the differential amplifier (10) is disclosed. This image circuit (18) resembles a differential amplifier input stage, couples to the signal inputs (28, 30) of the differential amplifier (10), and provides an output signal that reflects such bias current. One embodiment of the present invention feeds this output signal back to the differential amplifier input stage (34) to improve regulation of a constant current source (26). Another embodiment uses this signal to switch current from an external source (86) to the differential amplifier input stage (34) when a constant current source (26) within the differential amplifier input stage (34) fails to maintain a constant current supply.
    Type: Grant
    Filed: January 21, 1988
    Date of Patent: December 12, 1989
    Assignee: Texas Instruments Incorporated
    Inventors: William R. Krenik, Wei-chan Hsu, Richard Nail
  • Patent number: 4882698
    Abstract: An ALU comprising a tree-based carry structure, wherein the maximum fanout from any gate in the carry structure is three. When calculating optimized fanout, it is necessary to consider input capacitance to the following stage. In minimizing propagation delay, it is necessary to consider loading and the number of stages. It has been recognized that optimum fanout of results in optimized propagation through the ALU, thus fanout of three is the closest whole number. A cell has been designed which includes the necessary and sufficient circuitry for building multicell ALU's in a highly optimized structure. The cell provides individually accessible components and dedicated components for optimum layout in the end product.
    Type: Grant
    Filed: October 7, 1987
    Date of Patent: November 21, 1989
    Assignee: Harris Corporation
    Inventor: William R. Young
  • Patent number: 4881044
    Abstract: A wide-band and high-gain differential amplifier adapted to amplifying transmitted optical signals of the GHz band is constituted by GaAs MESFET's.Two MESFET's Q1 and Q2 are differentially connected to each other. Drains of Q1 and Q2 are connected to load resistances R.sub.L and R.sub.L via a source-drain path of other MESFET's Q3 and Q4 whose gates are grounded in AC-wise.Current by-passing means 4, 4 are connected to the sources of other MESFET's Q3, Q4. DC bias currents of the differential pair of MESFET's Q1, Q2 are set to relatively large values to increase the mutual conductance gm of the differential pair of MESFET's Q1, Q2. Despite a large DC bias current, the current by-passing means 4, 4 decrease the DC voltage drops across the load resistances R.sub.L, R.sub.L, and enable the differntial amplifier to operate on a low power source voltage.
    Type: Grant
    Filed: December 30, 1987
    Date of Patent: November 14, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Taizo Kinoshita, Satoshi Tanaka, Hirotoshi Tanaka, Nobuo Kotera, Minoru Nagata
  • Patent number: 4878728
    Abstract: An integrated optical device comprises stacked substrates provided with optical waveguides in different planes. The waveguides in different planes are interconnected by external optical elements.
    Type: Grant
    Filed: May 23, 1988
    Date of Patent: November 7, 1989
    Assignee: U.S. Philips Corporation
    Inventor: Lothar P. Mannschke
  • Patent number: 4878030
    Abstract: A microwave signal linearizer for a travelling wave tube amplifier (TWTA) provides for simple and flexible adjustment of a predistortion network suitable for independently compensating for a wide range of travelling wave tube amplifier-induced distortions. The linearizer or predistortion network is formed by three divided parallel passive microwave signal channels, the first channel having a coaxial microwave limiter diode network, the second channel having a variable attenuator for adjusting amplitude modulation (AM/AM) non-linearity, and a third channel for adjusting amplitude modulation to phase modulation (AM/PM) non-linearity. Signals directed to the first and second channels are combined in a 180.degree. hybrid network to produce a difference signal which is directed through a difference channel to a 90.degree. hybrid network. The signals through the third channel are directed to the 90.degree.
    Type: Grant
    Filed: October 23, 1987
    Date of Patent: October 31, 1989
    Assignee: Ford Aerospace & Communications Corporation
    Inventor: Arpad D. Vincze
  • Patent number: 4873494
    Abstract: An inductive loop presence detector, more especially a vehicle detector, including a loop oscillator having an inductive loop connected as a frequency determining element of the oscillator, which inductive loop may be buried in a roadway to sense the presence of vehicles, and sensing circuitry to detect changes in the loop oscillator frequency due to vehicle movements in the vicinity of the loop, with a filter network inserted between the output of the loop oscillator and the sensing circuitry to improve performance when cross-talk occurs due to mutual interference between a number of inductive loop detectors forming part of a total installation. The filter network can be a phase-locked loop incorporating a low pass filter to attenuate high frequency components due to cross-talk.
    Type: Grant
    Filed: March 13, 1984
    Date of Patent: October 10, 1989
    Assignee: Sarasota Automation Limited
    Inventor: Brian C. Jefferis
  • Patent number: 4871980
    Abstract: The analog power amplifier (PA) is particularly for a closed loop signal amplification requiring high output power, high efficiency, high speed, wide operating temperature range and a low number of components. The high efficiency is obtained thru an employment of multiple PAs and a nonlinear amplifier which completely eliminates controllable power switches. No thermal compensation and no matching of the output transistors, and no adjustments are necessary.A nonlinear amplifier amplifies an input signal and provides a plurality of interim signals each having a different transfer function with respect to the input signal. PAs separately amplify each of the interim signals and provide at least a portion of an output signal of the entire PA. The nonlinear amplifier includes a plurality of diode circuits for determining the transfer functions of the interim signals so that the output current take-over by the individual PAs is smooth.
    Type: Grant
    Filed: April 12, 1988
    Date of Patent: October 3, 1989
    Inventor: Zdzislaw Gulczynski
  • Patent number: 4868520
    Abstract: A high-frequency power synthesizing apparatus having a plurality of distributors arranged in a plurality of stages, a plurality of amplifiers which are supplied with outputs from a final stage of said power distributors and which amplify these outputs to a predetermined level, and a power synthesizing unit including initial-stage power synthesizers supplied with outputs from said amplifiers and a final-stage synthesizer which outputs power to an external load. The final-stage power distributors and the initial stage synthesizers are constituted by 0.degree.-hybrid modules. The output level of each amplifier is regulated and made constant by being compared with a predetermined level. The output levels of the amplifiers can be displayed on an external display.
    Type: Grant
    Filed: December 16, 1987
    Date of Patent: September 19, 1989
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Takashige Terakawa, Noriyuki Akaba, Sadayoshi Hattori
  • Patent number: 4866652
    Abstract: A method and apparatus for combining the multiply and ALU functions for floating point numbers to enable the completion of a multiply-accumulate operation in a shorter time. The multiplied fraction is left in sum and carry form and is provided in this form to the ALU, eliminating the CP adder from the multiplier. The normalization of the fraction and the corresponding changes to the exponent in the multiplier are also eliminated. The ALU can combine the sum and carry of the product fraction simultaneously if the exponents are sufficiently similar. Otherwise, the sum and carry of the fraction product is combined first and compared with the new fraction, with the smaller of the fractions being right shifted prior to their combination.
    Type: Grant
    Filed: September 1, 1987
    Date of Patent: September 12, 1989
    Assignee: Weitek Corporation
    Inventors: George K. Chu, Jan Fandrianto, Y. W. Sing
  • Patent number: 4866651
    Abstract: For successively adding a series of floating point numbers, a floating point adder stage (FIG. 2) is used which, in addition to the sum of two floating point operands, emits the remainder, truncated from the smaller operand, as a floating point number. For obtaining an exact sum of the operands, these remainders are summed in the form of intermediate sums. A circuit arrangement for parallel operation comprises series-connected floating point adder stages (FIG. 6), the intermediate sum occurring at the output of each stage and the intermediate remainder being buffered. Remainders are in each case passed on to the next stage, their value decreasing until they are zero. A serially operating arrangement (FIG. 8) comprises a single adder stage (30) and a register stack (34) for buffering the intermediate sums and the final result. A remainder occurring is stored in a remainder register (32) at the output of the adder stage and added to the intermediate sums until the remainder is zero.
    Type: Grant
    Filed: August 26, 1987
    Date of Patent: September 12, 1989
    Assignee: International Business Machines Corp.
    Inventors: J. Hartmut Bleher, Axel T. Gerlicher, Siegfried M. Rump, Dieter K. Unkauf
  • Patent number: 4865303
    Abstract: The present invention relates to a surgical table having a minimum number of function levels, pivot points and actuators and which is capable of achieving all desired surgical table movements. The surgical table includes a base portion which supports a vertical column whose height is adjustable by means of a first actuator. Pivotally supported at the top of the vertical column is a lateral tilt supporting level which may be tilted relative to the column by means of a second actuator. The lateral tilt level supporting structure is provided with a double acting hinge which supports the table top. The table top includes a back section and a seat section which are each attached to the pivot means. The back section may be pivoted relative to the pivot point by means of a third actuator, while the seat section may be pivoted relative to the pivot point by means of a fourth actuator. A leg section is pivotally attached to the seat section and may be pivoted relative thereto by means of a fifth actuator.
    Type: Grant
    Filed: November 23, 1987
    Date of Patent: September 12, 1989
    Assignee: American Sterilizer Company
    Inventor: George D. Hall
  • Patent number: 4864248
    Abstract: An amplifier arrangement with controllable gain comprising two differential amplifiers which are connected in parallel at their inputs and outputs and which have different gain factors which can be varied oppositely. The gain of one of said differential amplifiers is reduced in that a first resistor is connected between its input terminals and a second resistor is connected between at least one of said input terminals and the corresponding input terminal of the other differential amplifier. As a result, the input signal to this amplifier is subject to a voltage division enabling the input swing to be increased.
    Type: Grant
    Filed: December 4, 1987
    Date of Patent: September 5, 1989
    Assignee: U.S. Philips Corp.
    Inventor: Winfrid B. Jansen
  • Patent number: 4864527
    Abstract: In a floating point addition or subtraction procedure two shift operations of the operand fraction may be required. The first shift operation, based on the difference between the operand exponent arguments, involves aligning one of the operand arguments so that the addition or subtraction procedure between the operand fractions can be performed. In order to complete the associated computations correctly, it is necessary to know if any of the fraction positions removed from the fraction by the shift operation include non-zero signals, i.e., the operation typically referred to as computation of the "sticky" bit. The second important shift operation occurs after the addition or subtraction of the operand fractions has taken place. The interim resulting operand fraction must be normalized, i.e., a non-zero signal is placed in the most significant operand fraction bit position and the operand exponent argument adjusted accordingly.
    Type: Grant
    Filed: August 24, 1987
    Date of Patent: September 5, 1989
    Inventors: Victor Peng, William J. Bowhill, Nachum M. Gavrielov
  • Patent number: 4862102
    Abstract: A method and apparatus for minimizing the self heating distortion of a compensated differential transconductance amplifier having an error voltage generator is provided. In a preferred embodiment, the bases of a first pair of transistors are coupled together and to an adjustment voltage source. The bases of a second pair of transistors are coupled together and to a reference voltage source. The collectors of the transistor pairs are coupled together to form a differential current output. The output currents of the compensated amplifier are segregated into two currents, one originating in the error voltage generator, a second current being the remainder. The first current is directed to flow through the first pair of transistors, the second current is directed to flow through the second pair of transistors.
    Type: Grant
    Filed: January 29, 1988
    Date of Patent: August 29, 1989
    Assignee: Tektronix, Inc.
    Inventor: Marvin E. LaVoie
  • Patent number: 4861998
    Abstract: A device for the rapid detection of hydrocarbon fire inside an armored vehicle. Infrared radiation resulting from the appearance of the fire is detected using lithium tantalate as a pyroelectric sensor for producing a voltage signal. A voltage pulse is produced at the beginning of the infrared radiation. Alternatively, the current signal of the pyroelectric sensor may be used and subsequently integrated. Fire is detected by the presence of both infrared and ultraviolet radiation.
    Type: Grant
    Filed: January 7, 1987
    Date of Patent: August 29, 1989
    Assignee: Thomson-CSF
    Inventor: Andre Benhamou
  • Patent number: 4859962
    Abstract: The present amplifier is designed in such a way that the amplifier will exhibit a linear characteristic in response to small variations of the input signal and a hard switching characteristic in response to large variations of that input signal. Due to the design of this amplifier, the output signal will generally be proportional to the input signal, but will be able to respond more quickly to a sudden increase of the input signal. The present amplifier is particularly useful in an amplifying circuit of a videoamplifier.
    Type: Grant
    Filed: March 23, 1988
    Date of Patent: August 22, 1989
    Assignee: Oce-Nederland B.V.
    Inventors: Johannes M. M. Simons, Caspar P. M. Michels