Patents Represented by Attorney Elliott N. Kramsky
  • Patent number: 6538746
    Abstract: A single laser is stabilized sequentially in time with respect to different wavelengths in conjunction with a continuous, preferably linear, wavelength transition for absolute optical interferometric measurement. During the wavelength transition, the number of the traversing interferences is counted in a measuring channel. The length of a measuring section may be measured in absolute terms to give known and stable wavelengths and phase measurements of the two wavelengths. Active integrated optics and residual phase measurement by compensation in the integrated optics make it possible to detect wavelength differences of 10−7 &lgr;.
    Type: Grant
    Filed: November 17, 2000
    Date of Patent: March 25, 2003
    Assignee: Litef GmbH
    Inventor: Eberhard Handrich
  • Patent number: 6508157
    Abstract: A tool for dislodging lubrication-blocking debris from machinery elements. A housing includes a forward internal chamber. An adapter receives an explosive charge element and completes the chamber. The adapter includes an exteriorly-threaded portion for affixation of the tool to a lubrication access hole. A firing mechanism is positioned and spring loaded at a rear chamber of the housing. In use, the tool is inserted in place of a grease nipple and the explosive charge element detonated, for example, by striking the exposed end of the firing mechanism with as a hammer. A pulse of pressurized gases is thereby generated to clear the blocked lubrication passage.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: January 21, 2003
    Inventor: James S. Brown
  • Patent number: 6490923
    Abstract: A micromechanical rotation rate sensor based on the Coriolis principle includes two plate-like oscillators arranged one above the other in two planes for excitation to oscillate by means of an electrostatic drive. Three elements in each case form an oscillator structure. The oscillators are in each case suspended on opposite side edges by at least one web between an associated plate-like support and an associated drive plate element. The two supports and the two drive plate elements are, in each case, arranged one above the other in layers. A fixed plate element is located between the two drive plate elements so that, in each case, an identical narrow drive gap is defined between the drive plate elements. The drive gap is considerably smaller than the distance between the plate-like oscillators.
    Type: Grant
    Filed: December 14, 2000
    Date of Patent: December 10, 2002
    Assignee: LITEF GmbH
    Inventors: Uwe Breng, Martin Hafen, Eberhard Handrich, Bruno Ryrko
  • Patent number: 6486960
    Abstract: A tool for forming a sensor coil that may be employed, for example, in a fiber optic gyroscope with reduced Shupe effect-induced bias. The tool includes a takeup reel having a cylindrical mandrel with inner flanges fixed to its opposed ends sandwiched between two outer flanges. Each of the inner flanges includes a pair of radially-directed apertures that form a radially-directed wedge therebetween. A recess in the planar portion of each of the outer flanges that contacts an inner flange is aligned with the apertures. This permits the winding of the sensor coil to form climbing turns at the ends of wound layers that lie outside an encapsulated fiber pack. Such turns, which join layers with overlying layers, avoid crossovers and the resultant stress that contributes significantly to Shupe effect-induced bias. A sensor coil having reduced internal stress is thus also provided.
    Type: Grant
    Filed: February 27, 2001
    Date of Patent: November 26, 2002
    Assignee: Litton Systems, Inc.
    Inventors: Amado Cordova, Thomas McLean, Thomas Meloeny
  • Patent number: 6453570
    Abstract: A gyrocompass having a capsule, mounted to float in an air-tight fashion, for at least one electrically driven gyro. The capsule is produced from two mutually adapted shells which are sealed with respect to one another and consist of a high-strength, corrosion-resistant material which is a good electrical conductor. A steel alloy, titanium alloy, or a high-strength conducting plastic material is suitable. The device avoids electrically insulated bushings on the bottom and edge sides, substantially simplifying the configuration of an equatorial azimuthal tap. The mechanical stability of the capsule is conspicuously improved, and the official HSC requirements for fast ships are readily met.
    Type: Grant
    Filed: October 16, 2000
    Date of Patent: September 24, 2002
    Assignee: C. Plath
    Inventor: Armin Rahn
  • Patent number: 6422765
    Abstract: Modular apparatus for packaging and interfacing a planar photodiode with an optical fiber terminated in a ferrule. An elongated terminal pin protrudes from a header of a generally-cylindrical housing. The ferrule end of the fiber is received at the opposed end of the housing and aligned with a disk-shaped photodetector fixed to the end of the pin interior to the housing. A wire is bonded to a surface of the photodetector and, via the conductive casing of the header, to the housing to provide a miniaturized single-pin pigtailed modular arrangement that is readily adaptable for automated manufacturing process.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: July 23, 2002
    Assignee: Litton Systems, Inc.
    Inventors: Eric L. Goldner, Douglas E. Holmes, Carl J. Krantz
  • Patent number: 6374671
    Abstract: For the drive excitation, the method for the capacitive drive excitation of oscillators in sensors for the capacitive measurement of force, acceleration and, in particular, rotation rates according to the Coriolis principle, provides according to the invention for the use of high-frequency constant-amplitude pulse packets with no DC component, the width or phase angle of which can be adjusted in order to keep the oscillator speed constant, for the purpose of resetting or correcting tolerances.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: April 23, 2002
    Assignee: Litef GmbH
    Inventors: Bruno Ryrko, Günter Spahlinger, Walter Gutmann
  • Patent number: 6374672
    Abstract: A rotation sensor is formed of three semiconductor wafers. A first wafer comprises a frame that surrounds a paddle. The rotation-sensitive paddle is surrounded on either of the opposed sides of the first wafer by rings of driven elements formed of radially-directed plateaus in the semiconductor material. Second and third wafers sandwich the first wafer. Each of the second and third wafers includes a first surface in which are formed concentric rings of driver and pickoff electrodes. In a preferred embodiment, the rings of pickoff electrodes are split into two semicircular arcs.
    Type: Grant
    Filed: July 28, 2000
    Date of Patent: April 23, 2002
    Assignee: Litton Systems, Inc.
    Inventors: Henry C. Abbink, Youngmin A. Choi
  • Patent number: 6373048
    Abstract: A method and apparatus for stabilizing the scale factor of a fiber optic gyroscope in which a superluminescence diode or broadband multimode laser comprises the light source. The emission bandwidth injected into a fiber end from the light source is limited to a considerably narrower transmission bandwidth within the wavelength band of the intensity characteristic of the light by a narrowband optical filter. The temperature at the filter is measured, and the transmission bandwidth quickly corrected by means of a pre-calibrated look-up table when optical interference filters are employed. The readjusted wavelength value is used for scale factor calculations.
    Type: Grant
    Filed: July 20, 2000
    Date of Patent: April 16, 2002
    Assignee: Litef GmbH
    Inventor: Wolfgang Tschanun
  • Patent number: 6363584
    Abstract: A cuff link includes a magnetic arrangement for ready substitution of alternative decorative elements. One or more links of the cuff link comprises a frame member that is magnetically engageable to a removable element having a decorative exterior surface. The frame and the removable element include mating semi-cylindrical internal surfaces that receive disk-shaped pluralities of magnets. The disk-shaped magnets are arranged so that, when the frame is engaged to the replaceable element, they are aligned along a common axis whereby lines of magnetic flux are axially-directed therethrough to provide a strong bond. An edge of the removable element is bevelled to assist the wearer in ready substitution of replaceable elements.
    Type: Grant
    Filed: January 20, 2000
    Date of Patent: April 2, 2002
    Inventors: George Gero, Leslie C. Hoffman, Raymond D. Lathrop
  • Patent number: 6360602
    Abstract: A closed loop accelerometer includes apparatus within an associated digital rebalance loop for reducing the presence of low frequency moding noise in the accelerometer output. In one embodiment, the digitized corrective signal is applied to a moving average filter. In a second embodiment, the corrective signal is modulated with a random function and, in a third embodiment, the digitized corrective signal is both randomized and applied to a moving average filter. In each embodiment, the periodic moding noise that results from the analog-to-digital conversion within the rebalance loop is significantly reduced from that observed in prior art systems.
    Type: Grant
    Filed: July 29, 1999
    Date of Patent: March 26, 2002
    Assignee: Litton Systems, Inc.
    Inventors: Daniel A. Tazartes, Yumi Yoshida, John G. Mark
  • Patent number: 6357295
    Abstract: A sensor for measuring rotation rate with respect to three axes and linear acceleration with respect to two axes. Electromagnets comprising cores of high magnetic permeability and windings are fixed to structures that protrude inwardly from outer frames of upper and lower rotor assemblies. An element of high magnetic permeability is fixed to the facing surface of a rotor arm to create electromagnetic drives for counteroscillation of upper and lower sets of rotor arms. Accelerometers are horizontally aligned and fixed to the top surfaces of preselected rotor arms of the upper rotor assembly and to the bottom surfaces of aligned rotor arms of the lower set of rotor arms for measuring rotation rate with respect the x and y axes and linear acceleration with respect to the z axis. The two sets of rotor arms are connected by a torsion bar.
    Type: Grant
    Filed: July 28, 2000
    Date of Patent: March 19, 2002
    Assignee: Litton Systems, Inc.
    Inventor: Stanley F. Wyse
  • Patent number: 6321146
    Abstract: A sensor is provided on the vehicle of a driverless transport system. The sensor is based on the principle of a computer mouse for ascertaining either a drift angle &Dgr;&agr; or the transverse movement is detected as a path difference &Dgr;q whereby lateral drift due, for example, to roadway covering irregularities and to curves, is detected directly. A considerable improvement in the tracking accuracy of driverless transport vehicles is thereby provided.
    Type: Grant
    Filed: August 6, 1998
    Date of Patent: November 20, 2001
    Assignee: LITEF GmbH
    Inventor: Jürgen Schnell
  • Patent number: 6308569
    Abstract: Micromechanical inertial sensors are formed of a plurality of substantially-planar semiconductor wafers interspersed with oxide layers. The sensitive element is located within an internal aperture of a wafer of the device and is separate therefrom. It is connected to an overlying oxide layer at pedestals that minimize contact area to thereby reduce stray capacitance. Portions of side edges of the various wafers are successively recessed to create topside-exposed wafer sections that permit the grounding of all exposed portions of the device as operational potentials are applied to internal electrodes and sensitive elements.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: October 30, 2001
    Assignee: Litton Systems, Inc.
    Inventor: Robert E. Stewart
  • Patent number: 6294400
    Abstract: A precision, micro-mechanical semiconductor accelerometer of the differential-capacitor type comprises a pair of etched opposing cover layers fusion bonded to opposite sides of an etched proofmass layer to form a hermetically sealed assembly. The cover layers are formed from commercially available, Silicon-On-Insulator (“SOI”) wafers to significantly reduce cost and complexity of fabrication and assembly. The functional semiconductor parts of the accelerometer are dry-etched using the BOSCH method of reactive ion etching (“RIE”), thereby significantly reducing contamination inherent in prior art wet-etching processes, and resulting in features advantageously bounded by substantially vertical sidewalls.
    Type: Grant
    Filed: August 9, 2000
    Date of Patent: September 25, 2001
    Assignee: Litton Systems, Inc.
    Inventors: Robert E. Stewart, Arnold E. Goldman
  • Patent number: 6250158
    Abstract: A monolithic angular velocity sensor is formed from a common planar silicon substrate. Sensor element(s) comprising elongated beams is/are suspended within framed apertures formed within the common substrate. Transverse members, or ears, secure the elongated beam(s) to the frame and to the nodal points of the beam(s). Both single beam and multiple beam array sensors may be formed within a common silicon substrate. Orthogonally-directed beams, or arrays of beams, formed with a common substrate, permit angular velocity measurements about two orthogonal axes.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: June 26, 2001
    Assignee: Litton Systems, Inc.
    Inventor: Robert E. Stewart
  • Patent number: 6217229
    Abstract: A connector includes a pair of connector members for simultaneously contacting a first plurality of optical fibers with a second plurality of optical fibers. A cup for fixing the ferrule-tipped ends of mating optical fibers is wholly contained within each of a plurality of channels through the members. The cup is capable of axial movement within a channel through a body element of a connector member. A spring member is located in the channel between a back plate and the cup to act upon the base of the cup. Aligned dowel channels are provided for receiving a thick external dowel that resides within the aligned dowel channels of the body member of one of the connector members and the holder of the other. An internal dowel is press fit within the body element and holder dowel channels of the other connector member to enhance the ruggedness and durability of the device.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: April 17, 2001
    Assignee: Litton Systems, Inc.
    Inventors: Akbar Arab-Sadeghabadi, Agop H. Cherbettchian
  • Patent number: D456592
    Type: Grant
    Filed: March 26, 2001
    Date of Patent: May 7, 2002
    Inventor: Kathleen Conway
  • Patent number: D467704
    Type: Grant
    Filed: January 27, 1997
    Date of Patent: December 31, 2002
    Inventors: Julie Estelle Barrington, Lisa Jane Wheatley
  • Patent number: D468529
    Type: Grant
    Filed: December 20, 2001
    Date of Patent: January 14, 2003
    Inventor: Rafi G. Sabounjian