Patents Represented by Attorney, Agent or Law Firm Mann, Smith, McWilliam, Sweeney & Ohlson
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Patent number: 6483965Abstract: A method of writing a diffraction grating into a photosensitive optical transmission medium is disclosed, in which a first phase mask is used to generate an interference pattern in a second phase mask substrate and using photolithographic techniques. This produces a second phase mask, which is then use to write a diffraction grating into a photosensitive optical transmission medium. This method enables the line placement in a phase mask to be improved by averaging out the line placement errors.Type: GrantFiled: August 11, 2000Date of Patent: November 19, 2002Assignee: Nortel Networks LimitedInventors: Bruce R Napier, Sotiris E Kanellopoulos, Ricardo Feced
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Patent number: 6483914Abstract: A subscriber's telephone installation comprises a plurality of telephone sets coupled in parallel to a subscriber loop so as to provide a voice facility, and a data modern coupled to the subscriber loop so as to provide data facilities at a frequency above that employed for said voice facility. Some or preferably all telephone sets are provided with a respective filter arrangement incorporating series connected inductive and parallel connected capacitive elements for rejecting selected frequencies from the telephone set. The filter also incorporates a switch responsive to current drawn from the line for selectively enabling and disabling the filter arrangement when the telephone set is respectively in its off-hook condition or in its on-hook condition.Type: GrantFiled: May 6, 1999Date of Patent: November 19, 2002Assignee: Nortel Networks LimitedInventors: Roger James Williamson, Leslie Derek Humphrey, Bryan R Parlor
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Patent number: 6483842Abstract: A communications network arranged to provide multimedia switched services comprising a set of media components. The set of media components including IP traffic is encapsulated in an ATM virtual circuit and is switched as an entity using a robust signalling system so that the resultant connection records can then be employed for usage based tariffing purposes. This overcomes the problem of establishing billing records for connectionless traffic carried over a connection oriented network.Type: GrantFiled: July 14, 1999Date of Patent: November 19, 2002Assignee: Nortel Networks LimitedInventor: Roy Harold Mauger
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Patent number: 6483345Abstract: An interface circuit from Common Mode Logic to a low voltage, fixed common mode output, with high current drive. The CML signal is received, and then re-referenced to a low-voltage band-gap supply. The circuit is arranged to provide an output data signal referenced to a second positive reference voltage supply responsive to receipt of a common mode input data signal referenced to a first positive reference voltage supply. The circuit avoids use of vertical PNP transistors in the signal path.Type: GrantFiled: June 23, 1999Date of Patent: November 19, 2002Assignee: Nortel Networks LimitedInventors: Edward J Whittaker, Imran Sherazi
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Patent number: 6483617Abstract: An optical transmission system comprises a number of optical terminals connected by optical waveguides such as optical fibers. Nonlinear processes occurring within an optical transmission medium of the waveguide or within the optical terminals is detected by a monitor which outputs monitored data representative of the products of nonlinearity. The data is used to control the power of the optical signal such that power is regulated to avoid the onset of the nonlinear process. The data may also be used to indicate an alarm condition to an operator. A monitor for four wave mixing detection utilizes dither signals applied to respective frequency components of a wavelength division multiplexed signal, products of the four wave mixing process being detected in the monitor by correlation between a sample of a received optical signal and reference data representative of dither induced modulation in the four wave mixing product.Type: GrantFiled: August 11, 2000Date of Patent: November 19, 2002Assignee: Nortel Networks LimitedInventor: Kim Byron Roberts
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Patent number: 6483871Abstract: A digital signal phase detector comprising a first circuit arranged to provide a phase difference signal representative of both the clock period of a clock signal and the difference in phase between the clock and a data signal, and a second circuit arranged to provide a reference signal representative of the clock period of the clock signal. At least one of the first and second circuits is coupled to a set point control signal and the corresponding output signal is representative of that set point control signal. A comparison of the phase difference signal with the reference signal provides an indication of the difference between the desired set point of the circuit and the phase difference between the clock and the data signal. A corresponding method of digital signal phase detection is also provided.Type: GrantFiled: December 28, 1998Date of Patent: November 19, 2002Assignee: Nortel Networks LimitedInventor: Piers James Geoffrey Dawe
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Patent number: 6483805Abstract: A method of monitoring telecommunications network traffic comprising the steps of: receiving a packet stream comprising packets each identified as belonging to one of at least three classes; calculating a difference between the numbers of packets received identified as belonging to a first and a second of said classes; and deriving a measure of traffic load on the network responsive to said difference. The invention also relates to a method for admission control based on the above method of monitoring and a method for overcoming admission control avoidance. It also relates to apparatus embodying these methods.Type: GrantFiled: December 28, 1998Date of Patent: November 19, 2002Assignee: Nortel Networks LimitedInventors: Elwyn Brian Davies, Alan Stanley John Chapman
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Patent number: 6478465Abstract: A multiwall bag having a fold closeable end combined with a peelable opening assembly adapted to be held within the folded closure, that when opened, provides a pour spout for dispensing of the contents of the package, and optionally, means for reclosing the bag after it has been opened.Type: GrantFiled: August 6, 2001Date of Patent: November 12, 2002Assignee: Bemis Company, Inc.Inventor: Ronald G. Thrall
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Patent number: 6480495Abstract: A non-geostationary satellite connection-less network incorporates a plurality of satellite nodes and ground stations in communication with the nodes. The network is modeled by the corresponding virtual model network. In the virtual network, connections between users are available between virtual nodes and are made according to a restricted set of routing plans based on the modeled virtual paths between those nodes. The virtual model provides a means of determining admission of connection-orientated calls of different quality of service (QoS) traffic class requirements into the network with engineered grade of service (GoS) and QoS guarantees.Type: GrantFiled: August 26, 1999Date of Patent: November 12, 2002Assignee: Nortel Networks LimitedInventors: Roy Harold Mauger, Simon Daniel Brueckheimer
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Patent number: 6480061Abstract: This invention relates to an amplifier having digital micro-processor control apparatus and, in particular, to a high frequency power amplifier that includes a micro-processor control system to accurately regulate the operating point of the various amplifying elements in the high frequency power amplifier. The basic amplifier circuitry consists of a micro-controller, a variable voltage attenuator (VVA), a digital to analogue converter and an EEPROM. The EEPROM provides a lookup table which is read by the micro-controller, which then writes to the digital to analogue converter to set the control voltage to the variable voltage attenuator.Type: GrantFiled: January 10, 2000Date of Patent: November 12, 2002Assignee: Nortel Networks LimitedInventors: Graham Dolman, Peter King, Andrew John Booth
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Patent number: 6480524Abstract: Sectorisation has been used in cellular communications networks in order to increase capacity without the need for obtaining new cell sites. However, previously, the increase in the number of main antenna beams provided by a base station transceiver has not produced a commensurate increase in capacity. For example, a hex sectored tricellular network is found to provide an increase in capacity by a factor of only 1.6 over a tri sectored tricellular network despite the fact that twice as many antenna beams are provided. A multiple beam antenna arrangement is described where the increase in capacity is commensurate with the increase in the number of antenna beams provided. In one example, a nine sectored tricellular CMDA network is described which comprises a multiple beam antenna arrangement with six antenna elements each provided as columns. The antenna beams may be orthogonal and a 6×6 Butler matrix beamformer is used which is advantageously loss less.Type: GrantFiled: September 13, 1999Date of Patent: November 12, 2002Assignee: Nortel Networks LimitedInventors: Martin Stevens Smith, Mark Newton, James E Dalley
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Patent number: 6478116Abstract: A lubricating oil supplying arrangement for an apparatus having a rotating apparatus shaft with an oil pump is arranged at one end of the apparatus shaft (23) and is driven by this apparatus shaft (23). A pump housing (2) has a pocket (3) in the form of a chamber open on one side, in which two co-operating displacement elements (4,5) are so arranged that the pump housing (2) covers the displacement elements (4,5) axially on both sides at least in an operative region and in the circumferential direction over a maximum of 180°. The displacement elements (4,5) are held in position by a pump shaft (13). This pump shaft (13) is connected via coupling elements to the apparatus shaft (23) so that they rotate together. This permits a construction having narrow tolerances that is easy to assemble.Type: GrantFiled: October 27, 2000Date of Patent: November 12, 2002Assignee: Danfoss A/SInventors: Jørn Holger Klausen, Peter Frøslev
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Patent number: 6480650Abstract: It is known to couple a collimated beam of light into the end of an optical fibre with a graded index lens having an angled facet at the lens/fibre interface to reduce the amplitude of Fresnel retroreflected power. The expense incurred in providing angled facets is avoided by using a two-part compound lens. One part is a graded index lens part having an axial length shorter than a quarter period. To this is bonded a cylindrical uniform refractive index lens part whose index is matched with the effective refractive index of the fibre. This reduces the amplitude of the retroreflection power by causing the displacement of the Fresnel reflection from the lens focus.Type: GrantFiled: December 28, 2000Date of Patent: November 12, 2002Assignee: Nortel Networks LimitedInventors: Paul A Firth, Adrian Janssen
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Patent number: 6474909Abstract: A fluid assisted wedging and compacting device for the installation of underground cable that includes a blade with a cutting edge, two cutting faces a toe, a shoe, a cable feed tube, a pair of deflectors, a pair of grooves and a plurality of high pressure water jet nozzles. The blade is designed so that the deflectors and grooves are positioned in a vertical orientation on the lower half of the cutting faces of the blade. During use, the deflectors on the cutting faces deflect soil creating a soil free zone preventing blockage of the nozzles and allowing the water pressure from the nozzles to effectively aid the blade in cutting through the soil.Type: GrantFiled: October 20, 2000Date of Patent: November 5, 2002Inventor: Robert Malek
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Patent number: 6477566Abstract: In a management system of a communications network comprising a plurality of network elements, capacity and capability of one or more individual network elements is represented by a set of data templates. A first set of data templates represent internal construction and physical resources of a network element. A second set of templates represent connectivity capabilities of the physical resources. The data templates are stored at an element controller, controlling a plurality of network elements. The element controller learns about the capacity and capabilities of the network elements, by receiving a set of reference messages generated by the network elements, over an operations, administration and maintenance channel. The reference messages point to the data templates stored at the element controller thereby enabling efficient enrollment of network elements by transmission of compressed messages over the operations, administration and maintenance channel.Type: GrantFiled: January 21, 1998Date of Patent: November 5, 2002Assignee: Nortel Networks LimitedInventors: Nigel Robert Davis, Yossi Kanzen
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Patent number: 6474964Abstract: A scroll compressor having a cylindric hermetically closed shell, a suction chamber within the shell, a scroll mechanism in the shell, lubrication mist generating elements, a suction gas inlet opening radially into the suction chamber and a deflector plate in overlying relationship with the suction gas inlet and cooperating with the shell to delimit a duct having at least an upper opening feeding suction gas to the scroll mechanism. To uniformly laden the suction chamber with sufficient oil, the upper opening is shaped to deflect suction gas into a region within the suction chamber where an oil mist is generated by the mist generating elements during operation.Type: GrantFiled: April 17, 2001Date of Patent: November 5, 2002Assignee: Danfoss Maneurop A.S.Inventors: Jean De Bernardi, Pierre Ginies
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Patent number: 6477568Abstract: A network management system in a communications network comprises a managed object base having a plurality of managed objects describing individual resources of the network; a detection means for detecting changes for configuration of the network; a route finding means for generating data describing a set of routes of trails across said network, and a trail manipulation means for implementing changes to trails across the network. The trail manipulation means operates in four basic modes of operation, including a stretch operation in which a new node is inserted between first and second existing nodes and an existing trail between the first and second existing node is rerouted by the new node by creation of a pair of new links; Firstly, a stretch operation in which a new node is inserted between first and second existing nodes and an existing trail between the first and second existing node is re-routed via the new node by creation of a pair of new links.Type: GrantFiled: November 16, 1998Date of Patent: November 5, 2002Assignee: Nortel Networks LimitedInventors: Richard Stephen Borrett, Mark Uniacke
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Patent number: 6477249Abstract: A splitter separates telephony traffic (POTS) from digital subscriber line (ADSL) traffic occupying a higher frequency band. The splitter comprises a low-pass filter for passing the telephony traffic, the low-pass filter being operable to vary its filtering response between a first low-pass response for use during telephony speech traffic, and a second, more restrictive, low-pass response for use during at least part of the time that telephony signalling traffic is present. During speech traffic a filter is used which provides a good impedance match with a telephony terminal or linecard so as to minimize detrimental effects on sidetone and echo performance which may impair a user's speech quality. The filter response can be varied according to a detected property of the telephony traffic, such as amplitude or rate of change of amplitude of the traffic.Type: GrantFiled: September 17, 1998Date of Patent: November 5, 2002Assignee: Nortel Networks LimitedInventors: Roger James Williamson, Leslie Derek Humphrey
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Patent number: 6476660Abstract: The present invention provides a long time constant integrator circuit as part of an integrated circuit. The integrator circuit is fully integrated on chip with no external capacitive or resistive components for enhancing the circuit's time constant. It achieves a −3 dB cut-off frequency of 1.6 Hz. The circuit is realisable on a very small area of silicon being formed by a bipolar process using npn transistors, resistive and capacitive elements. The integrator circuit comprises a transconductance stage as an input to an operational amplifier. The circuit design is fully differential and employs realisable resistors and capacitors.Type: GrantFiled: July 28, 1999Date of Patent: November 5, 2002Assignee: Nortel Networks LimitedInventors: Pasqualino Michelle Visocchi, Edward J W Whittaker, Robin M Flett
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Patent number: D465543Type: GrantFiled: January 16, 2002Date of Patent: November 12, 2002Assignee: MO-EL S.R.L.Inventor: Carlo Bertani