Source: http://www.google.com/patents/US6792174?ie=ISO-8859-1&dq=7,013,345/
Timestamp: 2014-08-28 03:37:15
Document Index: 429383227

Matched Legal Cases: ['Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60']

Patent US6792174 - Method and apparatus for signaling between an optical cross-connect switch ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsMethods, apparatus and systems for signaling information between an optical cross-connect switch and attached network equipment such as Internet Protocol (IP) routers, WDM terminals, SONET add/drop multiplexers and ATM switches. In one embodiment, an out-of-band signaling interface between an optical...http://www.google.com/patents/US6792174?utm_source=gb-gplus-sharePatent US6792174 - Method and apparatus for signaling between an optical cross-connect switch and attached network equipmentAdvanced Patent SearchPublication numberUS6792174 B1Publication typeGrantApplication numberUS 09/704,445Publication dateSep 14, 2004Filing dateNov 1, 2000Priority dateNov 2, 1999Fee statusPaidAlso published asCA2389758A1, EP1228661A2, WO2001033895A2, WO2001033895A3, WO2001033895B1Publication number09704445, 704445, US 6792174 B1, US 6792174B1, US-B1-6792174, US6792174 B1, US6792174B1InventorsRajiv RamaswamiOriginal AssigneeNortel Networks LimitedExport CitationBiBTeX, EndNote, RefManPatent Citations (103), Non-Patent Citations (22), Referenced by (13), Classifications (25), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetMethod and apparatus for signaling between an optical cross-connect switch and attached network equipmentUS 6792174 B1Abstract Methods, apparatus and systems for signaling information between an optical cross-connect switch and attached network equipment such as Internet Protocol (IP) routers, WDM terminals, SONET add/drop multiplexers and ATM switches. In one embodiment, an out-of-band signaling interface between an optical cross-connect switch and attached network equipment is realized by using an out-of-band communication channel over a network. In another embodiment, a decentralized signaling interface is provided by one or more dedicated signal lines between an optical cross-connect switch and attached network equipment.
CROSS REFERENCE TO RELATED APPLICATIONS This non-provisional U.S. Patent Application claims the benefit of U.S. Provisional Patent Application No. 60/162,936 entitled �OPTICAL CROSSCONNECT WITH OPTICAL TO ELECTRICAL CONVERTERS� filed on Nov. 2, 1999 by inventor Rajiv Ramaswami; and also claims the benefit of U.S. Provisional Patent Application No. 60/170,094 entitled �OPTICAL CROSSCONNECT WITH BRIDGING, TEST ACCESS AND REDUNDANCY� filed on Dec. 10, 1999 by inventors Rajiv Ramaswami and Robert R. Ward; and also claims the benefit of U.S. Provisional Patent Application No. 60/170,095 entitled �OPTICAL CROSSCONNECT WITH LOW-LOSS BRIDGING, TEST ACCESS AND REDUNDANCY� filed on Dec. 10, 1999 by inventors Steven Clark and Rajiv Ramaswami; and also claims the benefit of U.S. Provisional Patent Application No. 60/170,093 entitled �1+1 OPTICAL PROTECTION USING OPTICAL CROSSCONNECT� filed on Dec. 10, 1999 by inventors Rajiv Ramaswami and Robert R. Ward; and also claims the benefit of U.S. Provisional Patent Application No. 60/170,092 entitled �SIGNALING INTERFACE BETWEEN OPTICAL CROSSCONNECT AND ATTACHED EQUIPMENT� filed on Dec. 10, 1999 by inventor Rajiv Ramaswami; and also claims. the benefit of U.S. Provisional Patent Application No. 60/186,108 entitled �1:N PROTECTION BETWEEN CLIENTS AND ALL-OPTICAL CROSSCONNECTS� filed on Mar. 1, 2000 by inventors Kent Erickson, Subhashini Kaligotla, and Rajiv Ramaswami which is incorporated herein by reference; and also claims the benefit of U.S. Provisional Patent Application No. 60/200,425 entitled �OPTICAL CROSSCONNECT SYSTEM� filed on Apr. 28, 2000 by inventors Rajiv Ramaswami, Steve Tabaska, and Robert Ward which is incorporated herein by reference.
An alternative approach is to develop an all optical, scalable cross-connect system which performs switching operations of light pulses or photons (referred to generally as �light signals�) without converting and reconverting signals between the optical domain to the electrical domain. However, switching light or photonic signals is different and introduces additional challenges over conventional electrical switching. One of these challenges is fault protection.
In the following description, certain terminology is used to describe various features of the present invention. For example, a �module� includes a substrate normally formed with any type of material or materials upon which components can be attached such as a printed circuit board or a daughter card for example. Examples of a �component� include an optical switch, a processing unit (e.g., Field Programmable Gate Array �FPGA�, digital signal processor, general microprocessor, application specific integrated circuit �ASIC�, etc.), splitters and the like. A �splitter� is an optical component that performs a bridging operation on an input light signal by splitting that light signal into two or more output light signals. Each module features one or more interfaces to transport information over a link. A �link� is broadly defined as one or more physical or virtual informationcarrying mediums that establish a communication pathway such as, for example, optical fiber, electrical wire, cable, bus traces, wireless channels and the like. �Information� can be voice, data, address, and/or control in any representative signaling format such as light signals (e.g., light pulses or photons).
As shown in FIG. 4, one embodiment for each of the optical switch matrices 241 and 242 includes multiple arrays 300 of micro-machined mirrors. Each mirror (e.g., mirror 310) features a mirrored surface 311 and torsional flexures 320 and 330 that enable the mirror 310 to adjust its physical orientation to reflect incoming light signals in any selected direction. Herein, both the first and second optical switch matrices 241 and 242 include Q micro-machined mirrors, where �Q� is less than or equal to the maximum number of I/O ports that can be supported by the optical cross-connect switching system 100. For this embodiment, �Q� is greater than or equal to 64 but less than or equal to 1152 (64≦Q ≦1152. However, the present invention is not limited to any maximum number of mirrors or I/O ports. It is contemplated, however, that the number of mirrors employed within the first and second optical switch matrices 241 and 242 may differ.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3651392Nov 10, 1969Mar 21, 1972Frisch Otto RBang-bang mirror position servomechanism controlling a laser scanning device for use in a track-following machineUS4365863May 29, 1980Dec 28, 1982Le Materiel Telephonique Thomson-CsfOptical switch for a very large number of channelsUS4369523Jun 10, 1980Jan 18, 1983Kokusai Denshin Denwa Co., Ltd.Remote control system of an optical repeaterUS4437190Nov 8, 1979Mar 13, 1984Boris RozenwaigDevice for switching signals by optical means and automatic switching units comprising said deviceUS4470154Dec 17, 1981Sep 4, 1984Ricoh Company, Ltd.Optical communication networkUS4519670Sep 14, 1982May 28, 1985Spinner Gmbh, Elektrotechnische FabrikLight-rotation coupling for a plurality of channelsUS4530566May 11, 1983Jul 23, 1985Bicc Public Limited CompanyOptical fiber duplex couplerUS4563774Oct 25, 1982Jan 7, 1986At&T Bell LaboratoriesAddress coded communication systemUS4580873Dec 30, 1983Apr 8, 1986At&T Bell LaboratoriesOptical matrix switchUS4612670May 16, 1984Sep 16, 1986General Dynamics CorporationElectro-optical connection between electronic modulesUS4634239Aug 3, 1984Jan 6, 1987Gte Laboratories IncorporatedMultiple port optical fiber switchUS4797879Jun 5, 1987Jan 10, 1989American Telephone And Telegraph Company At&T Bell LaboratoriesPacket switched interconnection protocols for a star configured optical lanUS4817014Sep 9, 1987Mar 28, 1989Endress U. Hauser Gmbh U. Co.Digital correlatorUS4843382Oct 10, 1986Jun 27, 1989Kokusai Denshin Denwa Co., Ltd.Method for monitoring a digital transmission lineUS4856863Jun 22, 1988Aug 15, 1989Texas Instruments IncorporatedOptical fiber interconnection network including spatial light modulatorUS4859012Aug 14, 1987Aug 22, 1989Texas Instruments IncorporatedOptical interconnection networksUS4886335Dec 28, 1988Dec 12, 1989Furukawa Electric Co., Ltd.Optical fiber switch systemUS4897830Jan 10, 1986Jan 30, 1990British Telecommunications, Public Limited CompanyOptical networksUS4903225Dec 23, 1988Feb 20, 1990Ampex CorporationHigh speed digital data correlator having a synchronous pipelined full adder cell arrayUS4982446Jul 12, 1988Jan 1, 1991British TelecommunicationsBit synchronization for optical networksUS4984238Mar 8, 1989Jan 8, 1991Fujitsu LimitedMethod and apparatus for frame synchronizationUS5035482Apr 6, 1989Jul 30, 1991Amp IncorporatedOptical switchUS5037173Nov 22, 1989Aug 6, 1991Texas Instruments IncorporatedOptical interconnection networkUS5157652Jul 24, 1990Oct 20, 1992Hewlett-Packard CompanyMeasurement of characteristics of broadcast optical networksUS5216729Nov 18, 1991Jun 1, 1993Harmonic Lightwaves, Inc.Active alignment system for laser to fiber couplingUS5253274Apr 15, 1992Oct 12, 1993International Business Machines CorporationMeans to differentiate between commands and data on a communications linkUS5260819Jun 14, 1991Nov 9, 1993Northern Telecom LimitedDigital telemetry system and method for fault detection in optical transmission systemUS5272556May 25, 1990Dec 21, 1993British TelecommunicationsOptical networksUS5299044Aug 24, 1992Mar 29, 1994At&T Bell LaboratoriesRanging method for use in TDMA systems on tree-and-branch optical networksUS5349550Jun 27, 1991Sep 20, 1994The United States Of America As Represented By The Secretary Of The NavyLong sequence correlation coprocessorUS5355238Aug 18, 1993Oct 11, 1994Swl Inc.Method and apparatus for the monitoring and demarcation of synchronous optical networksUS5359683Jun 10, 1993Oct 25, 1994Advanced Optronics, Inc.1�N electromechanical optical switchUS5440654Dec 30, 1993Aug 8, 1995Raytheon CompanyFiber optic switching systemUS5477364May 22, 1995Dec 19, 1995British Telecommunications Public Limited CompanyData transmission on optical networksUS5485300Aug 3, 1994Jan 16, 1996Fujitsu LimitedOptical transmitter and power setting method in optical transmitters for use in optical networksUS5487120Feb 9, 1994Jan 23, 1996International Business Machines CorporationOptical wavelength division multiplexer for high speed, protocol-independent serial data sourcesUS5488862Mar 8, 1994Feb 6, 1996Armand P. NeukermansMonolithic silicon rate-gyro with integrated sensorsUS5515361Feb 24, 1995May 7, 1996International Business Machines CorporationIn a star communications networkUS5521732Jun 8, 1994May 28, 1996Nec CorporationOptical wavelength selection control system in optical networksUS5521734Dec 30, 1994May 28, 1996At&T Corp.One-dimensional optical data arrays implemented within optical networksUS5524153Feb 10, 1995Jun 4, 1996Astarte Fiber Networks, Inc.Optical fiber switching system and method using sameUS5535293Dec 9, 1994Jul 9, 1996Buchin; Michael P.High-speed electro-optical modulator, chopper, and multiplexer/demultiplexerUS5539328May 24, 1995Jul 23, 1996Tandem Computers IncorporatedTermination for high frequency clock distribution pathUS5570371May 31, 1995Oct 29, 1996Nec CorporationPath trace byte collecting circuit for synchronous optical networksUS5608735Sep 20, 1995Mar 4, 1997Adtran, Inc.Logical transform operator-based method and apparatus for extracting framing pattern from serial digital bit streamUS5629790Oct 18, 1993May 13, 1997Neukermans; Armand P.Micromachined torsional scannerUS5629919Apr 27, 1995May 13, 1997Matsushita Electric Industrial Co., Ltd.Optical hadUS5648618Jan 31, 1996Jul 15, 1997Armand P. NeukermansMicromachined hinge having an integral torsion sensorUS5666487 *Jun 28, 1995Sep 9, 1997Bell Atlantic Network Services, Inc.Network providing signals of different formats to a user by multplexing compressed broadband data with data of a different format into MPEG encoded data streamUS5694389Feb 22, 1996Dec 2, 1997Kabushiki Kaisha ToshibaOFDM transmission/reception system and transmitting/receiving apparatusUS5699463Jun 28, 1995Dec 16, 1997Hewlett-Packard CompanyMechanical fiber optic switchUS5719903Jun 28, 1995Feb 17, 1998Motorola, Inc.Method and apparatus for receiving symbolsUS5727098Jan 6, 1995Mar 10, 1998Jacobson; Joseph M.Oscillating fiber optic display and imagerUS5729527Mar 19, 1996Mar 17, 1998Tellabs Operations, Inc.Fault management in a multichannel transmission systemUS5745274Dec 27, 1995Apr 28, 1998Lucent Technologies Inc.Maintenance of optical networksUS5774604Oct 23, 1996Jun 30, 1998Texas Instruments IncorporatedUsing an asymmetric element to create a 1XN optical switchUS5781537Jul 7, 1995Jul 14, 1998International Business Machines CorporationSetting up, taking down and maintaining connections in a communications networkUS5793746Apr 29, 1996Aug 11, 1998International Business Machines CorporationFault-tolerant multichannel multiplexer ring configurationUS5801863Feb 28, 1997Sep 1, 1998Lucent Technologies Inc.Method of monitoring performance/signal routingUS5825877Jun 11, 1996Oct 20, 1998International Business Machines CorporationSupport for portable trusted softwareUS5825949Apr 3, 1997Oct 20, 1998International Business Machines CorporationOptical wavelength division multiplexer for coupling to data sources and sinks, wherein at least two data sources and sinks operate with different communication protocolsUS5828476Jun 11, 1996Oct 27, 1998The Boeing CompanyDual rate, burst mode, radiation hardened, optical transceiverUS5864643Dec 20, 1996Jan 26, 1999E-Tek Dynamics, Inc.Miniature 1XN electromechanical optical switch and variable attenuatorUS5867289Dec 24, 1996Feb 2, 1999International Business Machines CorporationFault detection for all-optical add-drop multiplexerUS5892606Feb 28, 1997Apr 6, 1999Lucent Technologies, Inc.Maintenance of optical networksUS5900968Oct 10, 1996May 4, 1999Lucent Technologies Inc.Method of fast gain control in WDM optical networksUS5903687May 2, 1997May 11, 1999Neos Technologies, Inc.M input port by N output port optical switching systemUS5915063Jun 23, 1997Jun 22, 1999Colbourne; PaulVariable optical attenuatorUS5942937Nov 19, 1997Aug 24, 1999Advanced Micro Devices, Inc.Signal detection circuit using a plurality of delay stages with edge detection logicUS5960132Dec 31, 1997Sep 28, 1999At&T Corp.Fiber-optic free-space micromachined matrix switchesUS5963350Mar 29, 1995Oct 5, 1999British Telecommunications Public Limited CompanyOptical telecommunications networkUS5970201Sep 18, 1997Oct 19, 1999Lucent Technologies Inc.Power regulation in optical networksUS5978113Aug 29, 1997Nov 2, 1999Kight; William DorseyApparatus for remote loopback testing and isolation of loss of signal failures within synchronous optical networksUS6002818Dec 5, 1997Dec 14, 1999Lucent Technologies IncFree-space optical signal switch arrangementUS6005993May 26, 1998Dec 21, 1999Macdonald; Robert I.Deflection optical matrix switchUS6008915Oct 18, 1996Dec 28, 1999Lucent Technologies, Inc.Method of identifying faults in WDM optical networksUS6009220Dec 12, 1997Dec 28, 1999Chan; Chun-KitSurveillance system for passive branched optical networksUS6046833Feb 9, 1998Apr 4, 2000Optical Networks, Inc.Method and apparatus for operation, protection, and restoration of heterogeneous optical communication networksUS6047331Feb 19, 1997Apr 4, 2000Massachusetts Institute Of TechnologyMethod and apparatus for automatic protection switchingUS6061482Dec 10, 1997May 9, 2000Mci Communications CorporationChannel layered optical cross-connect restoration systemUS6069924Feb 20, 1998May 30, 2000Matsushita Electric Industrial Co., Ltd.Differential detector with error correcting functionUS6072612Aug 8, 1997Jun 6, 2000Lucent Technologies, Inc.WDM transmitter for optical networks using a loop-back spectrally sliced light emitting deviceUS6081361Oct 17, 1997Jun 27, 2000Lucent Technologies Inc.Sub-carrier multiplexing in broadband optical networksUS6097858Jun 5, 1998Aug 1, 2000Astarte Fiber Networks, Inc.Sensing configuration for fiber optic switch control systemUS6097859Feb 12, 1998Aug 1, 2000The Regents Of The University Of CaliforniaMulti-wavelength cross-connect optical switchUS6108311Apr 29, 1996Aug 22, 2000Tellabs Operations, Inc.Multichannel ring and star networks with limited channel conversionUS6130876 *Sep 24, 1997Oct 10, 2000At&T CorpMethod and apparatus for restoring a networkUS6147968Oct 13, 1998Nov 14, 2000Nortel Networks CorporationMethod and apparatus for data transmission in synchronous optical networksUS6148124Nov 20, 1998Nov 14, 2000Lucent TechnologiesWavelength division multiplexed optical networksUS6160821Nov 3, 1998Dec 12, 2000Sony International (Europe) GmbhSynchronization of digital communication systemsUS6188810Mar 3, 1999Feb 13, 2001Agilent Technologies, Inc.Reversible ring coupler for optical networksUS6188814Aug 3, 1999Feb 13, 2001Lucent Technologies Inc.Packaged microelectromechanical devices and systemsUS6195402Sep 17, 1997Feb 27, 2001Matsushita Electric Industrial Co., Ltd.Pattern matching apparatusUS6198571Mar 31, 1999Mar 6, 2001Afc Technologies Inc.Computerized intelligent optical amplifier for multi-channel optical networksUS6207949Nov 10, 1999Mar 27, 2001Telcordia Technologies, Inc.Method and apparatus for stabilizing attenuators in optical networksUS6252689 *Apr 10, 1998Jun 26, 2001Aircuity, Inc.Networked photonic signal distribution systemUS6253001Jan 20, 2000Jun 26, 2001Agilent Technologies, Inc.Optical switches using dual axis micromirrorsUS6272154 *Oct 30, 1998Aug 7, 2001Tellium Inc.Reconfigurable multiwavelength network elementsUS6295154May 12, 1999Sep 25, 2001Texas Instruments IncorporatedOptical switching apparatusUS6392220Sep 2, 1999May 21, 2002Xros, Inc.Micromachined members coupled for relative rotation by hingesEP0674457A2Mar 9, 1995Sep 27, 1995Fujitsu LimitedSwitching equipmentEP0721275A2Dec 28, 1995Jul 10, 1996Nec CorporationOAM controll system in an optical networkEP0752794A2Jun 17, 1996Jan 8, 1997Fujitsu LimitedCross-connect device for optical networks* Cited by examinerNon-Patent CitationsReference1A. Himeno, R. Nagase, T. Ito, K. Kato and M. Okuno; Photonic Inter-Module Connector Using 8�8 Optical Switches for Near-Future Electronic Switching Systems.2A. Himeno, R. Nagase, T. Ito, K. Kato and M. Okuno; Photonic Inter-Module Connector Using 8x8 Optical Switches for Near-Future Electronic Switching Systems.3All Optical Regeneration, Simon, et al., 2000 IEEE pp. 53-54.4An Economic Analysis for Core Optical Transport Networks, Peter Wong & Mark Yin,.5Experimental Study of Internet Stability and Backbone Failures, Craig Labovitz, Abha Ahuja, Farnam Jahanaian, 1999 IEEE, pp. 278-285.6Free-Space Micromachined Optical Switches with Submillisecond Switching Time for Large-Scale Optical Crossconnects, Lin, et al., 04/98, pp. 525-527.7Gustaffson, K. & Hok, B., A Batch-Processed Optical Scanner Proc. 12th Nordic Semiconductor, Meeting, Jevnaker (Oslo: Center for Industrial Research) pp. 282-285 (1986).8Gustaffson, K. & Hok, B., a Silicon Light Modulator, Journal of Physics E. Scientific Instruments 21, pp. 608-5 (1998).9Gustaffson, K. & Hok, B., Fiberoptic Switching and Multiplexing with a Micromechanical Scanning Mirror, Digest of Technical Papers 4th Int. Conf. on Solid State Sensors and Actuators (Tokyo: Institute of Electrical Engineers of Japan) pp. 212-215 (1987).10IEICE Transactions on Communications; E77-B(1994) Feb., No. 2, Tokyo, JP.11Laor, H., et al., Performance of a 576 � 576 optical cross connect, NFOEC-99.12Laor, H., et al., Performance of a 576 x 576 optical cross connect, NFOEC-99.13Lin L.Y., et al., Free-Space Micromachined Optical-Switching Technologies and Architectures, OFC/100C '99, Feb. 21-26, 1999.14Lin, L.Y. et al.; "Micro-Electro-Mechanical Systems (MEMS) for WDM Optical-Crossconnect Networks", Milcom 1999; IEEE Miltary Communications Conf Proceedings; Atlantic City, NJ Oct. 31-Nov. 3, 1999; pp. 954-957.15Lin, L.Y., et al., Free-Space Micromachined Optical-Switching Technologies and Architectures, OFC/100C '99, Feb. 21-26, 1999.16Okamoto, S. et al.; "Optical Path Cross-Connect Node Architectures for Photonic Transport Network", Journal of Lightwave Technology, vol. 14, No. 6, Jun. 1996, pp. 1410-1422.17Operation and Maintenance for an All-Optical Transport Network, Bischoff, et al., 11/96, IEEE Communications Magazine, pp. 136-142.18Optical Networks: A Practical Perspective; Rajiv Ramaswami & Kumar Sivarajan; Morgan Kaufmann Pub. 1988, pp. 152-161.19Optical Networks: A Practical Perspective; Rajiv Ramaswami & Kumar Sivarajan; Morgan Kaufmann Pub. 1998, Chapter 10, pp. 423-462.20The Optical Internet A New Network Architecture, Kaufman, et al., pp. 1-13.21The Photonic Switch Completes the Much-Vaunted All-Optical Network, Technology Investor, Chad White, Oct. 2000, pp. 28-31.22Types and Characteristics of SDH Network Protection Architectures; ITU-T Recommendation G.841 (10/98).Referenced byCiting PatentFiling datePublication dateApplicantTitleUS6973229Feb 28, 2001Dec 6, 2005Lambda Opticalsystems CorporationNode architecture for modularized and reconfigurable optical networks, and methods and apparatus thereforUS7010620 *Dec 6, 2001Mar 7, 2006Emc CorporationNetwork adapter having integrated switching capabilities and port circuitry that may be used in remote mirroringUS7013084Feb 28, 2001Mar 14, 2006Lambda Opticalsystems CorporationMulti-tiered control architecture for adaptive optical networks, and methods and apparatus thereforUS7415031 *Jul 30, 2001Aug 19, 2008Null Networks LlcData link/physical layer packet diversion and insertionUS7480821 *May 31, 2005Jan 20, 2009Agere Systems Inc.Method for encoding/decoding a binary signal state in a fault tolerant environmentUS7694023 *Jan 24, 2006Apr 6, 2010Lockheed Martin CorporationRouting a processor communicationUS7856544Aug 18, 2008Dec 21, 2010International Business Machines CorporationStream processing in super node clusters of processors assigned with stream computation graph kernels and coupled by stream traffic optical linksUS7941387Nov 5, 2007May 10, 2011International Business Machines CorporationMethod and system for predicting resource usage of reusable stream processing elementsUS8037284Nov 9, 2010Oct 11, 2011International Business Machines CorporationStream processing in optically linked super node clusters of processors by mapping stream graph to nodes and linksUS8121478Mar 20, 2009Feb 21, 2012International Business Machines CorporationMethod and apparatus for implementing non-blocking computer interconnection network using bidirectional optical switchUS8125984Mar 21, 2008Feb 28, 2012International Business Machines CorporationMethod, system, and computer program product for implementing stream processing using a reconfigurable optical switchUS8155515 *Dec 29, 2003Apr 10, 2012Verizon Business Global LlcMethod and apparatus for sharing common capacity and using different schemes for restoring telecommunications networksUS8194691Aug 28, 2006Jun 5, 2012Null Networks LlcData link/physical layer packet buffering and flushing* Cited by examinerClassifications U.S. Classification385/17, 385/39, 385/31, 385/24, 385/16, 385/18International ClassificationH04Q11/00, G02B6/43Cooperative ClassificationH04Q2011/0024, H04J14/0293, H04J14/0297, H04Q2011/0041, H04Q11/0062, H04Q2011/0081, H04Q2011/0083, H04Q2011/0073, H04Q11/0066, H04Q2011/0043, H04Q2011/0088, G02B6/43, H04J14/0295, H04Q2011/0026, H04Q2011/005European ClassificationH04Q11/00P4, H04J14/02P8Legal EventsDateCodeEventDescriptionMar 10, 2014ASAssignmentFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ROCKSTAR BIDCO, LP;REEL/FRAME:032422/0919Effective date: 20120509Owner name: ROCKSTAR CONSORTIUM US LP, TEXASFeb 24, 2012FPAYFee paymentYear of fee payment: 8Oct 28, 2011ASAssignmentEffective date: 20110729Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NORTEL NETWORKS LIMITED;REEL/FRAME:027164/0356Owner name: ROCKSTAR BIDCO, LP, NEW YORKFeb 21, 2008FPAYFee paymentYear of fee payment: 4Apr 5, 2002ASAssignmentOwner name: XROS, INC., CALIFORNIAFree format text: CORRECTIVE ASSIGNMENT TO CORRECT THE NAME OF ASSIGNEE THAT WAS PREVIOUSLY RECORDED ON REEL 011744, FRAME 0515;ASSIGNOR:RAMASWAMI, RAJIV;REEL/FRAME:012787/0676Effective date: 20020312Owner name: XROS, INC. 2505 MISSION COLLEGE BLVD.SANTA CLARA,Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE NAME OF ASSIGNEE THAT WAS PREVIOUSLY RECORDED ON REEL 011744, FRAME 0515.;ASSIGNOR:RAMASWAMI, RAJIV /AR;REEL/FRAME:012787/0676Apr 23, 2001ASAssignmentOwner name: NORTEL NETWORKS LIMITED, CANADAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RAMASWAMI, RAJIV;REEL/FRAME:011744/0515Effective date: 20010416Owner name: NORTEL NETWORKS LIMITED WORLD TRADE CENTER OF MONTFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RAMASWAMI, RAJIV /AR;REEL/FRAME:011744/0515RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google