Patents Represented by Attorney, Agent or Law Firm Neil Teitelbaum & Associates
  • Patent number: 5913369
    Abstract: The present invention relates to an automatic lift mechanism for a manifold in a pneumatic delivery system of an agricultural air cart for seed and fertilizer delivery. The unitary manifold is composed of a plurality of pneumatic passages and mixing valves for conducting metered product from to delivery tubes in a delivery tool. The lift mechanism includes a hydraulic cylinder for rotating a pivotal support rod and pivotal linkages connected to the manifold to lower and disengage the manifold from the meters and to position it to one side of the cart in a service position exposing the under carriage for access. A guide is provided to cooperate with the cylinder and pivotal linkages to guide substantially vertical movement of the manifold for disengaging and engaging the meters for sealing contact. The lift mechanism further includes a lock for maintaining the manifold in sealing contact in an operational position under tension once the actuating cylinder is depressurized.
    Type: Grant
    Filed: November 18, 1997
    Date of Patent: June 22, 1999
    Assignee: Flexi-Coil Limited
    Inventors: Cameron D. Bodie, Russell J. Memory
  • Patent number: 5915063
    Abstract: A variable, hybrid optical attenuator has a flexure member which consists of a bridge portion joining two prongs which are flexibly movable relative to the bridge portion. A mirror is mounted on the bridge portion. The prongs are each connected to an actuator which can expand or contract in response to a control signal applied thereto. The control signal may be heat, an electric field, a magnetic field or, preferably, a combination thereof. The attenuator is positioned opposite a pair of optical waveguides so that an input optical signal from an input waveguide is incident on the mirror and, upon reflection, is received by the second waveguide. Attenuation of the transmission is effected by controlled tilting of the mirror caused by appropriate control signals, single or in combination, applied to one or both of the actuators.
    Type: Grant
    Filed: June 23, 1997
    Date of Patent: June 22, 1999
    Inventors: Paul Colbourne, Jasvinder Obhi, Neil Teitelbaum
  • Patent number: 5912762
    Abstract: A thin film polarizing device has first and second light transmissive substrates in the form of prisms and a plurality of thin film layers disposed between the prisms. The thin film layers and have predetermined thicknesses and refractive indices which allow unpolarized incident light to be separated into s-polarized and p-polarized light beams. Both frustrated total internal reflection and thin film interference are simultaneously employed to allow s-polarized light to be transmitted and p-polarized light to be reflected over a wide range of wavelengths and angles of incidence. The polarizing device may be used as a polarizer or a polarizer beam splitter.
    Type: Grant
    Filed: August 12, 1996
    Date of Patent: June 15, 1999
    Inventors: Li Li, Jerzy A. Dobrowolski
  • Patent number: 5912645
    Abstract: In the past, parabolic offset reflector antennas were fed a signal through a corrugated horn in order to optimize field distribution and polarization at the reflector. It has been found that cost savings and other advantages are realized by using an array of radiating patches. The geometrical placement of the radiating patches and the power distribution to each patch is arranged such that radiated energy from the patches sums at the reflector surface to produce the predetermined field distribution and polarization.
    Type: Grant
    Filed: March 19, 1997
    Date of Patent: June 15, 1999
    Assignee: Her Majesty the Queen in Right of Canada, as Represented by the Minister of Industry through the Communications Research Centre
    Inventors: Jim Wight, David J. Roscoe
  • Patent number: 5910454
    Abstract: The present invention relates to a solid burnable fuel composition which contains a major proportion of spent dried coffee grounds for forming into high density pellets, synthetic fire-logs and fire kindling products. A homogeneous mixture of at least 50% coffee, with 30% or less by weight of a combustible binder is compressed and extruded in the form of fire-logs. A pellet fuel comprising entirely coffee provides a higher energy fuel source than prior art fuel sources. Coffee has a higher calorific value than hardwood, providing an efficient fuel material requiring less combustible binder, such as wax, than prior art fire-logs, and offering a higher energy value pellet than wood without added binder.
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: June 8, 1999
    Inventor: Rodney K. Sprules
  • Patent number: 5909295
    Abstract: An optical device simultaneously provides a multiplexing and demultiplexing function and combines dichroic WDM filter technology with Bragg grating filter technology. A plurality of adjacent sequential ports of a multi-port optical circulator serve as a vehicle for launching and receiving a multi-wavelength optical signal to be separated by the Bragg and dichroic filters. Other adjacent sequential ports having similar filters tuned to different wavelengths provide paths for combining the other wavelengths of light into a single signal. Conveniently a single circulating port serves as the input/output port of the device. The configuration can be applied an optical waveguide structure and, or more particularly to an optical fiber structure. Furthermore this configuration can combine multiplexing/demultiplexing function with a dispersion compensation function by adding a group of fiber Bragg gratings to a port of a circulator.
    Type: Grant
    Filed: November 6, 1996
    Date of Patent: June 1, 1999
    Inventors: Jinghui Li, Mark Farries, Joseph Ip
  • Patent number: 5907627
    Abstract: A fingerprint sensing device and recognition system includes an array of closely spaced apart semiconductor dies bonded to a substrate. The dies are spaced with a minimal space that will ensure that adjacent edges of the dies do not wipe against one another when a finger is pressed upon them. Each die includes an row/column array of sense elements that are coupled to a drive circuit and a sense circuit by sets of row and column conductors, respectively. The sense elements are actively addressable by the drive circuit. Capacitances resulting from individual finger surface portions in combination with sense electrodes are sensed by the sense circuit by applying a potential to the sense electrodes and measuring charging characteristics.
    Type: Grant
    Filed: November 6, 1995
    Date of Patent: May 25, 1999
    Assignee: Dew Engineering and Development Limited
    Inventor: Stephen J. Borza
  • Patent number: 5905801
    Abstract: A method is provided for transmitting and/or receiving files via a facsimile machine or computer fax modem. Electronic binary files residing on a computer, for example executable files, word processing files, database files and other types of files are converted to a machine readable binary bitmap in the form of a black and white bar code. Preferably the converted file is encrypted before being transmitted and printed. A receiving computer fax modem or facsimile machine can then print the file for later retransmission or storage, or a computer fax modem can reconstruct the file so that it can be used and/or executed after being received.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: May 18, 1999
    Assignee: Her Majesty the Queen in Right of Canada, as represented by the Minister of Industry through the Communications Research Centre
    Inventor: Nur M. Serinken
  • Patent number: 5905824
    Abstract: An optical device comprising a planar waveguide, and a second portion spaced from the planar waveguide portion by a gap to receive optical signals therefrom, the planar waveguide portion including: means integrated therein for separating an input beam into sub-beams having different central wavelengths; the second portion having closely spaced waveguides for receiving the sub-beams of light and having passive temperature compensation means coupled therewith for enhancing the coupling of the optical signals having predetermined wavelengths provided by the first block with the closely spaced waveguides.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: May 18, 1999
    Inventors: Vincent Delisle, Neil Teitelbaum
  • Patent number: 5903686
    Abstract: A system of interconnected functionally identical modules for switching P optical signals to P locations in a non-blocking manner is disclosed. Each of the functionally identical modules provides a same function, which may or may not be provided in an identical manner. Each module has several of first ports and several second ports optically coupled to second ports of other modules. Switching means are provided for switching means for switching between the first ports and the second ports. Each module has at least a second port is directly coupled to another second port. Providing a system wherein modules are identical provides numerous advantages. The architecture further provides the advantage of ease of repair within no disturbance to communications being handled by other modules.
    Type: Grant
    Filed: August 21, 1997
    Date of Patent: May 11, 1999
    Inventor: Robert I. MacDonald
  • Patent number: 5900539
    Abstract: A method for evaluating rheological properties of certain non-Newtonian liquids employs the principle of a multiple forced flow of a single sample of the liquid through an orifice, thus effecting a significant elongation of the sample. The liquid is forced through the orifice by means of a piston. Preferably, the orifice is built into the piston so that the liquid remains stationary during the piston advance. The timing and rate of the sequential strokes of the piston are controlled and the differential pressure across the orifice is measured. A function between the timing of the piston strokes, the stroke rate and the differential pressure can be determined. The function has been found to represent a relatively reliable rheological "signature" of the tested liquid.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: May 4, 1999
    Assignee: Alberta Research Council
    Inventors: Bernard Tremblay, Mario De Rocco, Rodney K. Ridley, Surindar Singh, Kerry Scott
  • Patent number: 5896193
    Abstract: A method and apparatus of generating a test signal for broadcast to a plurality of locations for testing optical devices is disclosed. A tunable laser sweeps from a lower wavelength to a higher upper wavelength providing a test station with a variable input signal. A timing signal generated from the variable input signal is provided to the test station to determine the frequency of the variable input signal so that tests may be performed at several known wavelengths. Amplification is added to the system to provide sufficient power to the variable input signal and timing signal both split by a splitter to be provided to multiple test stations simultaneously.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: April 20, 1999
    Assignee: JDS Fitel Inc.
    Inventors: Paul Colbourne, Gary S. Duck, Vasile Prunes, Carey M. Garrett
  • Patent number: 5888067
    Abstract: A dental implant for anchoring in bone, wherein said bone comprises an outer cortical bone section and an inner cancellous bone section is made of a body of resorbable material such as coral, having a portion capable of being wedged into the cancellous bone. The body of coral has a generally cylindrical root portion, an emergent portion capable of being wedged into said outer cortical bone section, and a transgingival coronal portion being sized to extend beyond said emergent portion to end beyond a gingival layer, and an abutment portion and a head for retention of said prosthetic device at the other end, wherein said abutment portion meets said coronal portion at an interface beyond said gingival layer. The body of coral is substantially electroplated with a suitable plating material such as gold. At least some of the root portion is absent said plating material so as to allow the bone to enter the substantially plated body of coral to resorb and replace at least some of the coral.
    Type: Grant
    Filed: August 15, 1997
    Date of Patent: March 30, 1999
    Inventors: David Gibbs, Neil Teitelbaum
  • Patent number: 5881191
    Abstract: A device for releasably mounting an adapter designed for coupling two fiberoptic connectors, e.g. SC connectors, has a body with a cavity sized to match the outside profile of the adapter when inserted in said cavity for a securely captive position. The adapter has two outside spring clips. The cavity has a bottom wall, two side walls, an upper wall and two detentes disposed to engage the spring clips when the adapter is fully inserted into the cavity. A leaf spring is disposed at the bottom of the cavity and is adapted to bias the adapter towards the upper wall of the cavity whereby the spring clips engage the detentes. The bottom wall and the spring are designed to form an enlargement of the cavity in the front part thereof when the spring is depressed, the enlargement enabling a manual tilting of the adapter causing a disengagement of the clips with the detentes whereby the adapter can be removed.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: March 9, 1999
    Assignee: JDS Fitel Inc.
    Inventor: Jonathan Liberty
  • Patent number: 5878176
    Abstract: A multi-port optical circulator for transmitting light from incoming and outgoing ports circularly includes one or more birefringent crystal plates disposed adjacent to one another for dividing an input beam into two beams having orthogonal polarizations and for combining two beams having orthogonal polarizations into a singe beam. Polarization beam splitting cubes introduce a beam to an opposite direction depending on the direction of the polarization of the beam and thereby substantially reflecting only one of s and p-polarizations of the beam. A polarization rotator between the first dividing and combining birefringent crystal and said polarization dependent beam splitting cube makes two orthogonal polarization vectors parallel or the two parallel polarization vectors orthogonal to one another.
    Type: Grant
    Filed: August 25, 1997
    Date of Patent: March 2, 1999
    Inventor: Yihao Cheng
  • Patent number: 5872834
    Abstract: A telephone is provided with a biometric input sensor for receiving a biometric input and providing a signal in dependence upon said biometric input to the telephone network. Such a signal may identify an individual using certain telephone equipment. When used in conjunction with a public phone system, the telephone provides identification for billing, access privileges, and follow me call routing.
    Type: Grant
    Filed: September 16, 1996
    Date of Patent: February 16, 1999
    Assignee: Dew Engineering and Development Limited
    Inventor: Neil Teitelbaum
  • Patent number: 5870049
    Abstract: A current mode digital-to-analog converter (DAC) consisting of a bias generator, a current mode scale-down section and a current mode scale-up section is presented which converts an n-bit digital input into an analog output. The bias generator ensures a constant reference current is caused to flow into both scale-down and scale-up sections of the DAC. The scale-down section uses the m lower-order bits of the n-bit digital input to generate a combined fractional current based on the reference current. The (n-m) higher-order bits of the n-bit digital input are used by the scale-up section to generate a multi-unit current based on the reference current. The fractional and multi-unit currents are simultaneously added together onto the output node to generate the desired analog output.
    Type: Grant
    Filed: April 16, 1997
    Date of Patent: February 9, 1999
    Assignee: MOSAID Technologies Incorporated
    Inventors: Chaogang Huang, Bruce Millar, Claude Chouinard
  • Patent number: 5867802
    Abstract: A method and system are provided for restricting the use of a vehicle such as an automobile to a person or persons whose fingerprints match biometric data stored within a memory in the vehicle's control system. A user's digitized fingerprints are stored in a non-volatile permanent ROM in the BIOS of a microcontroller on in a ROM accessed by a microprocessor. The microprocessor's primary task is that of executing instructions related to the operation of the vehicle, such as regulating the fuel flow rate, and performing other such tasks. Before the microprocessor can execute its instructions related to its primary task it, must complete and exit a conditional loop of instructions that relate to validating a user's "real-input" biometric data. Real scanned fingerprints must be compared with fingerprint(s) stored in ROM. If the result of the compare is a true, i.e. is a match, then the conditional loop is satisfied and the microprocessor can execute its instructions relating to operating the vehicle.
    Type: Grant
    Filed: August 2, 1996
    Date of Patent: February 2, 1999
    Assignee: Dew Engineering and Development Limited
    Inventor: Stephen J. Borza
  • Patent number: 5859420
    Abstract: An optical imaging device such as a fingerprint imager or a CCD camera, has a reduced size due to the provision of multiple lenses which are associated with respective CCDs. The optical path between the lenses and the CCDs is shortened. In a fingerprint version of the device, a staircase-shaped prism is advantageously used in combination with the multiple lens and multiple CCD arrangement. An alignment means is provided to facilitate the reconstructing the image out of partial images created by separate CCDs.
    Type: Grant
    Filed: December 4, 1996
    Date of Patent: January 12, 1999
    Assignee: Dew Engineering and Development Limited
    Inventor: Stephen J. Borza
  • Patent number: 5850493
    Abstract: An optical device comprising an optical element optically coupled with at least two lenses, each lens having at least a substantially collimating end, the at least substantially collimating ends being inwardly facing one another and each lens having a substantially focusing end, the substantially focusing ends being outwardly facing, and at least one waveguide disposed adjacent and spaced from the each outwardly facing end for coupling light to or from an adjacent lens, the waveguides each having an end that is separated from its adjacent lens by an optical distance of approximately d1, an optical distance between the two collimating end faces of the at least two lenses being d2, where d1 is approximately equal to one half d2.
    Type: Grant
    Filed: July 18, 1997
    Date of Patent: December 15, 1998
    Inventor: Yihao Cheng