Patents Represented by Attorney, Agent or Law Firm Charles E. Wands
  • Patent number: 6097260
    Abstract: A distributed ground pad-based isolation arrangement for a multilayer stripline architecture is configured to effectively inhibit the mutual coupling of signals between overlapping regions of adjacent stripline networks of dielectrically separated transmission networks, without substantially increasing either the mass of the laminate structure or the lossiness of the stripline. At regions of mutual overlap, the stripline layers are spatially oriented at right angles to one another, and a limited area ground pad is interleaved between the stripline layers. To maintain the desired characteristic line impedance of a stripline layer as it passes over a ground pad, the width of the stripline layer is reduced in the overlap region. Each ground pad is connected to an external ground reference by plated vias, that extend through the dielectric layers and intersect outer grounded shielding layers of the laminate.
    Type: Grant
    Filed: January 22, 1998
    Date of Patent: August 1, 2000
    Assignee: Harris Corporation
    Inventors: Walter M. Whybrew, Jeffery C. May, Douglas E. Heckaman
  • Patent number: 6092404
    Abstract: An electronic lock housing assembly provides a lock retrofit for a transportation industry-standard cargo door lock assembly. The electronic lock assembly is configured to protect the electronic components of the lock from impact, moisture and foreign matter. The exterior housing retains an electronic lock cylinder and its cam assembly at the exterior of truck door, so as to engage the rotatable lever of a standard mechanical door latch assembly. The interior housing retains the lock's electronic circuitry directly behind the exterior housing on the opposite, interior side of the door, so as to facilitate electrical interconnection through a mechanically shielded channel in the door.
    Type: Grant
    Filed: June 1, 1998
    Date of Patent: July 25, 2000
    Assignee: Intellikey Corporation
    Inventor: Kn Singh Chhatwal
  • Patent number: 6091522
    Abstract: An ultra-wideband signal processor, such as that employed for processing narrow time domain radar return pulses, includes a coherent acousto-optic Bragg cell channelizer having a plurality of IF outputs from which a plurality of IF output signals respectively representative of energy content of respectively different frequency portions of the RF input signal are derived. A summing circuit is coupled to sum the IF output signals to produce a summation signal representative of their average energy content. This average energy signal is compared with a threshold to determine if the input signal is a valid RF signal. A delay circuit delays a selected one of the IF output channels by a time sufficient to accommodate summation of the channelizer outputs and determining whether a valid RF signal is present. A digital signal processor processes the delayed selected output signal in response to the summation signal exceeding the threshold.
    Type: Grant
    Filed: July 6, 1998
    Date of Patent: July 18, 2000
    Assignee: Harris Corporation
    Inventors: Peter F. Snawerdt, III, Mark D. Koontz, Randall K. Morse, Norman C. Hollingsworth
  • Patent number: 6091867
    Abstract: An M.times.N optical switching system has a plurality of M optical input ports, each of which is directs a respectively associated optical input beam along one of M spaced apart coplanar parallel input optical paths intersecting an optical coupling path. N optical output ports are installed of the input ports at spaced apart locations of the optical coupling path. Each optical output ports receives a respective optical signal along one of N spaced apart coplanar output optical paths that intersect the optical coupling path apart. M+N mirrors are alignable with a normal bisecting a common angle at a respective intersection of the M input optical paths and the N output optical paths with the optical coupling path. A plurality of actuators controllably move selected mirrors into and out of the optical coupling path, so as to cause an optical signal incident at a selected one of the M optical input ports to be coupled to a selected one of the N optical output ports.
    Type: Grant
    Filed: April 30, 1999
    Date of Patent: July 18, 2000
    Assignee: Neos Technologies, Inc.
    Inventors: Eddie H. Young, Faramarz Frank Ghassemi
  • Patent number: 6082431
    Abstract: A garage door bracing arrangement has a plurality of vertically extending door-stiffening column members, which are pivotally attached to upper mounting brackets affixed to garage building structure directly above the garage door opening. Lower mounting brackets are affixed to second ends of the column members and are anchored to the garage floor directly beneath the upper mounting brackets. The door-stiffening column members are configured as generally hollow, rigid, telescoping sections having longitudinal channels which retain fasteners that project from sides of the telescoping sections, so as to pass through holes in mounting brackets that affix the door-stiffening column members to the garage building structure, and deflection brackets that secure the column members to door panel hinge joints.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: July 4, 2000
    Inventor: Salvatore Michael Decola
  • Patent number: 6079836
    Abstract: A droplet travel path monitoring mechanism for a flow cytometer is operative to adjust the droplet break-off point back to an initially calibrated spatial location, in the event of the departure from calibrated timing of gaps in the unsorted fluid droplet stream that have been created by the deflection of charged droplets. In addition, the flow cytometer is operative to monitor prescribed characteristics of deflected droplet streams, and to controllably adjust drop-sorting deflection parameters, so as to maintain the deflected travel path of sorted droplets coincident with the opening into a sorted droplet collection container, thereby maximizing collection of all sorted droplets.
    Type: Grant
    Filed: July 20, 1998
    Date of Patent: June 27, 2000
    Assignee: Coulter International Corp.
    Inventors: Robert Burr, Todd Lary, Erich Frazier, Osvaldo E. Miranda, Jr.
  • Patent number: 6078216
    Abstract: A digital signal processor-resident RF power amplifier performance monitor generates and updates signals for controlling each of an adaptive predistortion unit and a vector modulator of a preamplification signal processing loop, and a vector modulator of a feed-forward error extraction and reinjection loop. A performance monitoring routine subjects monitored aliased data to a window function and determines the spectrum of the data. The spectral data is applied to a sensitivity mask, which masks the data in accordance with a carrier--intermodulation distortion function associated with the operation of the amplifier. The output of the mask is processed to derive a measure of intermodulation distortion power. The intermodulation distortion power is subjected to an error minimization operator, such as a perturbational gradient search, that adjusts each of the control signals for the components of the loops, in such a manner as to maximally cancel intermodulation distortion products.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: June 20, 2000
    Assignee: Spectrian Corporation
    Inventor: James Arthur Proctor, Jr.
  • Patent number: 6075634
    Abstract: A fiber optic digital communication system and associated transponder architecture interfaces Gigabit Ethernet digital data over an extended range fiber optic link (e.g. upwards of 30 to 100 km), using digital data signal regeneration and optical signal processing components, that pre- and post-compensate for distortion and timing jitter, and thereby ensure accurate regeneration of the data at the far end of the extended distance fiber optic link. Regeneration in both the transmit and receive paths compensates for signal degradation resulting from the very substantial `long haul` fiber distance between transponder sites, and timing jitter customarily present in low cost short haul fiber optic transceiver components. A high speed, low jitter, limiting current driver drives a distributed feedback laser, minimizing jitter generation, and optimizing range extension margin.
    Type: Grant
    Filed: August 5, 1998
    Date of Patent: June 13, 2000
    Assignee: JDS Uniphase Corporation, UBP
    Inventors: Paul W. Casper, James W. Toy, Marc Sawyer
  • Patent number: 6070301
    Abstract: Hammer rebound shock and hand and wrist fatigue associated with the use of a wire seating and/or cutting tool, such as an impact tool, is alleviated by a covering at least the butt end of the tool handle with an internally ribbed cushioning sleeve of elastically deformable material, such as soft rubber. Because of its ribbed configuration and soft rubber material, the cushioning sleeve readily absorbs the rebound of the hammer impact force that would otherwise be transmitted through the handle in the course of operation of the tool, and thereby provides shock protection for the craftsperson's hand.
    Type: Grant
    Filed: January 15, 1999
    Date of Patent: June 6, 2000
    Assignee: Harris Corporation
    Inventor: Michael M. Fallandy
  • Patent number: 6072838
    Abstract: A reduced cost digital data modulation and demodulation scheme for very small aperture terminal (VSAT) satellite communication systems combines non-coherent frequency detection with trellis-coded, multi-frequency modulation. The technique is robust to phase noise and frequency uncertainty and is capable of achieving the performance of rate one-half phase shift keyed modulation. The code width of data to be transmitted bears a prescribed relationship to the size of a multiple frequency set and the selection of a given combination of frequencies within that set for transmission during a respective baud. One portion the data is convolutionally encoded and provides a pointer to one of plural groups of orthogonal signal sets associated with frequencies into which the multiple frequency set has been partitioned. Another portion of the data identifies the frequency combination within the group pointed to by the one portion. The combined portions encode a multi-frequency waveform transmitted to the receiver site.
    Type: Grant
    Filed: April 6, 1999
    Date of Patent: June 6, 2000
    Assignee: Koos Technical Services, Inc.
    Inventors: Larry W. Koos, William M. Koos, Jr., Peter E. Mallory
  • Patent number: 6067296
    Abstract: A channel interface architecture for a time division multiplexed (TDM) data communication system has a plurality of TDM communication ports coupled to serial TDM communication channels. The channel interface architecture interfaces data from any channel of any TDM communication port with any TDM communication channel of any other TDM communication port, on a per time slot/channel basis. The architecture includes a parallel data bus portion, an address bus portion, and a control portion. Each of a plurality of TDM communication channel interface units, associated with the ports, includes a multipage memory that stores data received from an associated serial communication link. The memory also selectively stores data that has been asserted onto the data bus portion of the bus architecture from another interface unit.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: May 23, 2000
    Assignee: Adtran, Inc.
    Inventors: Kevin Paul Heering, Robert David Deaton, John Robert Coffman, III, Michael Francis Lamy
  • Patent number: 6058162
    Abstract: The performance of digital subscriber loops is tested through transmission, reception and analysis of a multi-tone power ratio (MTPR) waveform, containing plural discrete tones having equal spectral spacings and notches periodically distributed among the tones. The noise floor at a missing sub-carrier spectral location is integrated and compared to signal power of an adjacent sub-carrier within the test vector waveform. From these two values, MTPR is determined for various carrier locations, so that maximum theoretical loop payload can be calculated. To generated a figure of merit (FOM) under test, a data modem is placed at each end of the loop. The FOM obtained from MTPR analysis is channel based, not equipment based, and is independent of receiver implementation. Before placing a new customer in service, the MTPR FOMs for a number of loops are compared to bit rate information in a database, which correlates MTPR with a bit rate for a specific modem.
    Type: Grant
    Filed: December 5, 1997
    Date of Patent: May 2, 2000
    Assignee: Harris Corporation
    Inventors: George Rodney Nelson, Richard D. Roberts, Ronald S. Squires
  • Patent number: 6052098
    Abstract: To reduce sidelobes in the radiation pattern of a phased array dipole antenna, a plurality of parasitic antenna elements are provided adjacent to the array of dipole elements of the antenna. The driven elements of the dipole array and associated director elements are formed as patterned conductor elements on one surface of a thin dielectric substrate. Feed elements for the driven dipole array also comprise patterned conductor elements formed on an opposite surface of the substrate. The feed elements have a geometry and mutually overlapping projection relationship with the conductors of the driven dipole elements, so as to form a matched impedance transmission line through the dielectric substrate with the patterned dipole elements. The parasitic elements are formed on additional dielectric substrates spaced apart from and parallel to the thin dielectric substrate upon which the driven dipole array is formed.
    Type: Grant
    Filed: March 17, 1998
    Date of Patent: April 18, 2000
    Assignee: Harris Corporation
    Inventors: William D. Killen, Heriberto J. Delgado
  • Patent number: 6052215
    Abstract: A solid state acoustic travelling wave lens comprises a thin core layer of acoustic and light transmissive material, such as crystalline quartz, compression-bonded between a pair of outer or cladding layers, such as fused silica, having an acoustic velocity that is only slightly higher than (e.g., less than five percent of) that of the core material. The acoustic mode field characteristic of the weakly guiding device contains no spatial variations caused by Fresnel diffraction in an unguided wave device. In a second embodiment, shear stress coupling between the core and cladding layers is inhibited by interposing very thin liquid boundary layers between the core layer and the cladding layers. Such thin liquid boundary layers, which are relatively more compressible than the core and cladding material, allow longitudinal waves to be transmitted across the core/cladding boundary (through the liquid), but prevent transmission of shear waves therebetween.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: April 18, 2000
    Assignee: Harris Corporation
    Inventors: Robert M. Montgomery, Reeder N. Ward, Mark T. Montgomery, Pat O. Bentley
  • Patent number: 6051474
    Abstract: The tendency of mobile positive ions to be transported into device regions of a bipolar transistor is effectively minimized by surrounding the transistor with a `positive ion`-attracting electric field, preferably by applying a prescribed bias to the fill material of a conductive trench that surrounds the device. The trench which surrounds a respective device to be protected contains dielectric material disposed along sidewalls of the trench. The trench contains material such as undoped polysilicon, which is capable of distributing a voltage, so that the material in the trench is insulated by dielectric material from an adjacent portion of the semiconductor substrate surrounded by the trench. In order to prevent mobile positive ions from moving into a device region in response to temperature bias stress and thereby degrade an operational parameter of the transistor, a predefined (relatively negative) bias voltage is applied to the material in the trench.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: April 18, 2000
    Assignee: Intersil Corporation
    Inventor: James Douglas Beasom
  • Patent number: 6047947
    Abstract: A proportional solenoid-driven valve control assembly contains a moveable, magnetic armature positioned adjacent to one end of a fixed pole piece that protrudes from a solenoid bore and is supported by means of a pair of flat suspension springs adjacent to the one end of the bore. The movable armature is configured to provide two generally cylindrical radial magnetic flux paths. One flux path traverses a radial gap at one end of fixed magnetic pole piece that protrudes from the one end of the solenoid bore. The other flux path traverses a generally cylindrical gap between a rim portion of the armature and an inwardly projecting magnetic element of the solenoid housing. The two radially separate cylindrical gaps function as coaxial guide air-bushings for the moveable magnetic armature that prevent off-axis play between the moveable armature and the pole piece and the inwardly projecting magnetic element.
    Type: Grant
    Filed: December 10, 1997
    Date of Patent: April 11, 2000
    Assignee: Teknocraft, Inc.
    Inventor: Viraraghavan S. Kumar
  • Patent number: 6046986
    Abstract: The inability of an ISDN equipment user to properly configure ISDN terminal equipment, even when provided with correctly assigned switch protocol, SPID and LDN parameters by a telephone service provider, is successfully remedied by a SPID/switch protocol detector. Upon being invoked by the user, the routine proceeds to conduct an iterative search of stored SPID formats associated with different central office switch protocols. SPIDs are assembled in accordance with the iteratively accessed SPID formats and directory number information that has been entered by the user. If an attempt to register a SPID is successful, the routine places a test call. If the test call is successful, the SPID and its associated switch protocol will have been identified, and the terminal equipment may place a call.
    Type: Grant
    Filed: September 4, 1997
    Date of Patent: April 4, 2000
    Assignee: Adtran, Inc.
    Inventors: James M. Glass, III, Paul G. McElroy, Michael T. Lattanzi, Charles R. Rehage
  • Patent number: 6044066
    Abstract: An auto-SPID detection routine is operative to conduct an iterative search of stored SPID formats associated with different central office switch protocols, based upon directory information including an area code supplied by a user. If an attempt to register a SPID is successful, the routine places a test call. If the test call is successful, the SPID and its associated switch protocol will have been identified, and the terminal equipment may place a call. If an attempt to register a SPID is unsuccessful, a determination is made as to whether the area code is a subdivided or split area code. If so, the routine is reexecuted using another area code derived from a split area code table.
    Type: Grant
    Filed: July 8, 1997
    Date of Patent: March 28, 2000
    Assignee: Adtran, Inc.
    Inventor: James M. Glass, III
  • Patent number: 6043924
    Abstract: An acoustic traveling wave lens structure for an acousto-optic scanner comprises a confined height fluid-containing channel, upon which a scanned optical beam to be modulated by a acoustic traveling wave is incident. The channel is bounded by spaced-apart walls that extend between a first end of the scanner channel, to which an acoustic transducer is coupled, and a second end of the channel that terminates an acoustic traveling wave launched from the acoustic transducer. The thickness of the channel is linearly tapered from the first end to the second end, so as to maintain a constant acoustic power density. To compensate for the attenuation in acoustic power through the water medium, the waveguide may be heated, to maintain the temperature of the liquid medium (water) within the waveguide channel within a prescribed temperature range over which the acoustic velocity remains substantially constant or undergoes a relatively small variation.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: March 28, 2000
    Assignee: Harris Corporation
    Inventors: Robert M. Montgomery, Reeder N. Ward, Mark T. Montgomery, Pat O. Bentley
  • Patent number: 6040707
    Abstract: A constant slew rate amplifier has a precision internal slew rate control reference, that generates respective positive-going and negative-going voltages, associated with corresponding excursions in the input signal. These slew rate-defining voltages are decoupled from the line, making it possible to drive the line with an amplified output signal that faithfully follows the input signal and conforms with prescribed slew rate and rise/fall time specifications, irrespective of the capacitance of the line. In addition, the constant slew rate amplifier of the present invention is configured to minimize power dissipation during non-transitional signal conditions, while providing substantial current to rapidly drive the line from one state to another in accordance with the input signal.
    Type: Grant
    Filed: September 15, 1997
    Date of Patent: March 21, 2000
    Assignee: Intersil Corporation
    Inventors: William R. Young, William B. Shearon