Inventor · disambiguated record
Christopher B. Marshall
Also filed as: MARSHALL CHRISTOPHER · MARSHALL CHRISTOPHER B · MARSHALL CHRISTOPHER BRIAN · MARSHALL CHRISTOPHER DR
43 granted patents·5 pending applications·885 citations·filing 1982–2022
98Inventor score
Files withPHILIPS CORP15KONINKL PHILIPS ELECTRONICS NV11UBLOX AG9GEOTATE BV2MARSHALL CHRISTOPHER BRIAN2
Top patents by PatentIndex Score
48 records- 0195US4768187ASignal transmission system and a transmitter and a receiver for use in the systemPHILIPS CORP·Filed 1986·Granted Aug 30, 1988·158 cites·8 claims
- 0295US4488119AFM DemodulatorPHILIPS CORP·Filed 1982·Granted Dec 11, 1984·92 cites·1 claims
- 0392US6618671B2Method of determining the position of a mobile unitKONINKL PHILIPS ELECTRONICS NV·Filed 2001·Granted Sep 9, 2003·91 cites·22 claims
- 0490US4696055ARF tuning circuit which provides image frequency rejectionPHILIPS CORP·Filed 1985·Granted Sep 22, 1987·72 cites·8 claims
- 0589US4723318AActive polyphase filtersPHILIPS CORP·Filed 1985·Granted Feb 2, 1988·64 cites·10 claims
- 0686US7010267B2Arrangement with beacon for providing information serviceKONINKL PHILIPS ELECTRONICS NV·Filed 2002·Granted Mar 7, 2006·70 cites·14 claims
- 0785US4713563Ad.c. Block capacitor circuit for rejection of d.c. offsetPHILIPS CORP·Filed 1986·Granted Dec 15, 1987·39 cites·17 claims
- 0885US4523324ADirect modulation FM data receiverPHILIPS CORP·Filed 1982·Granted Jun 11, 1985·41 cites·3 claims
- 0981US7183925B2Interactive system using tagsKONINKL PHILIPS ELECTRONICS NV·Filed 2003·Granted Feb 27, 2007·22 cites·19 claims
- 1078US8253822B2Method of position stamping a photo or video clip taken with a digital cameraYULE ANDREW T·Filed 2011·Granted Aug 28, 2012·3 cites·5 claims
- 1176US8804551B2Location estimation by observing wireless signalsMARSHALL CHRISTOPHER·Filed 2011·Granted Aug 12, 2014·8 cites·17 claims
- 1274US12015452B2Estimating and using characteristic differences between wireless signalsUBLOX AG·Filed 2019·Granted Jun 18, 2024·5 cites·18 claims
- 1374US9681408B2Determining clock-drift using signals of opportunityU-BLOX AG·Filed 2015·Granted Jun 13, 2017·3 cites·17 claims
- 1473US4864643ARadio transmission system providing adjacent channel and image frequency rejectionPHILIPS CORP·Filed 1986·Granted Sep 5, 1989·44 cites·5 claims
- 1572US9035827B2Positioning using a local wave-propagation modelMARSHALL CHRISTOPHER BRIAN·Filed 2012·Granted May 19, 2015·6 cites·16 claims
- 1672US7898579B2Method of position stamping a photo or video clip taken with a digital cameraUBLOX AG·Filed 2009·Granted Mar 1, 2011·2 cites·4 claims
- 1769US11009580B2Intercepting an uplink signal to assist in timing or positioning calculationsUBLOX AG·Filed 2017·Granted May 18, 2021·2 cites·20 claims
- 1866US7103340B2Antenna diversity arrangementKONINKL PHILIPS ELECTRONICS NV·Filed 2002·Granted Sep 5, 2006·9 cites·9 claims
- 1965US11269046B2Phase-comparison of multi-frequency transmissions for assisting the determination of position or timeUBLOX AG·Filed 2017·Granted Mar 8, 2022·1 cites·20 claims
- 2065US8779980B2Position validationYULE ANDREW THOMAS·Filed 2011·Granted Jul 15, 2014·3 cites·13 claims
- 2159US7619662B2Method of position stamping a photo or video clip taken with a digital cameraGEOTATE BV·Filed 2004·Granted Nov 17, 2009·3 cites·14 claims
- 2257US5832374ARadio transceiver including transmitter power control circuitPHILIPS CORP·Filed 1996·Granted Nov 3, 1998·21 cites·5 claims
- 2356US7233282B2GPS receiver with encrypted data transmissionNXP BV·Filed 2003·Granted Jun 19, 2007·4 cites·6 claims
- 2453US5678199ATransceiver with controlled transmit/receive impedance switching devicePHILIPS CORP·Filed 1996·Granted Oct 14, 1997·29 cites·6 claims
- 2552US8248487B2Method of creating an image file with combined image data and raw GPS data and a digital camera for the sameYULE ANDREW T·Filed 2007·Granted Aug 21, 2012·0 cites·4 claims
- 2652US7065329B2Half duplex radio transceiver with low IF receiverKONINKL PHILIPS ELECTRONICS NV·Filed 2002·Granted Jun 20, 2006·2 cites·8 claims
- 2752US5502744AData coding systemPHILIPS CORP·Filed 1993·Granted Mar 26, 1996·20 cites·27 claims
- 2852US2023078300A1Method for enabling coherent reception of a radio signal and radio receiver for coherent reception of a radio signalUBLOX AG·Filed 2022·Application pending·0 cites
- 2950US6597900B1Circuit arrangement providing impedance translation filteringKONINKL PHILIPS ELECTRONICS NV·Filed 2000·Granted Jul 22, 2003·4 cites·10 claims
- 3049US7986268B2GPS RF front end and related method of providing a position fix, storage medium and apparatus for the sameNXP BV·Filed 2007·Granted Jul 26, 2011·1 cites·7 claims
- 3148US7679556B2Method of determining a GPS position fix and a GPS receiver for the sameGEOTATE BV·Filed 2006·Granted Mar 16, 2010·1 cites·7 claims
- 3248US7089112B2Method of determining the position of a mobile unitKONINKL PHILIPS ELECTRONICS NV·Filed 2003·Granted Aug 8, 2006·5 cites·7 claims
- 3348US4672636AAFC circuit for direct modulation FM data receiversPHILIPS CORP·Filed 1985·Granted Jun 9, 1987·17 cites·19 claims
- 3446US6590365B2Method of powering-up battery powered apparatusKONINKL PHILIPS ELECTRONICS NV·Filed 2001·Granted Jul 8, 2003·2 cites·17 claims
- 3544US11567164B2Intercepting an uplink signal to assist in timing or positioning calculationsUBLOX AG·Filed 2016·Granted Jan 31, 2023·0 cites·15 claims
- 3643US5991607ATelecommunication device with switching arrangement constructed as a ring circuitPHILIPS CORP·Filed 1997·Granted Nov 23, 1999·13 cites·17 claims
- 3743US2002094797A1Connectionless broadcast signallingKONINKL PHILIPS ELECTRONICS NV·Filed 2002·Application pending·0 cites
- 3841US11601307B2Estimating one or more characteristics of a communications channelUBLOX AG·Filed 2018·Granted Mar 7, 2023·0 cites·21 claims
- 3940US2002049041A1Transceiver for time divison systemKONINKL PHILIPS ELECTRONICS NV·Filed 2001·Application pending·0 cites
- 4039US8184045B2Processing of satellite positioning system signalsMARSHALL CHRISTOPHER B·Filed 2008·Granted May 22, 2012·0 cites·20 claims
- 4139US5852634AData coding systemPHILIPS CORP·Filed 1996·Granted Dec 22, 1998·10 cites·2 claims
- 4238US11175413B2Phase-comparison for assisting the determination of position or timeUBLOX AG·Filed 2017·Granted Nov 16, 2021·0 cites·10 claims
- 4337US4994994AApparatus performing modulo p addition, where operands are expressed as powers of a generator, using a reduced size zech look-up tablePHILIPS CORP·Filed 1989·Granted Feb 19, 1991·10 cites·5 claims
- 4436US11061104B2Method and apparatus for positioning with wireless signalsUBLOX AG·Filed 2019·Granted Jul 13, 2021·0 cites·27 claims
- 4535US2013328720A1Satellite Positioning with Mixed Capture-ParametersMARSHALL CHRISTOPHER BRIAN·Filed 2012·Application pending·0 cites
- 4634US2006149871A1Wireless security beacon for consumer equipmentKONINKL PHILIPS ELECTRONICS NV·Filed 2003·Application pending·0 cites
- 4733US10187815B2Calculating a ranging measurement in a cellular communications networkU BLOX A G·Filed 2016·Granted Jan 22, 2019·0 cites·16 claims
- 4830US5008849AApparatus adding values represented as residues in modulo arithmeticPHILIPS CORP·Filed 1989·Granted Apr 16, 1991·8 cites·5 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →