Inventor · disambiguated record
David N. Critchlow
Also filed as: CRITCHLOW DAVID N · CRITCHLOW DAVID NORTON
28 granted patents·1 pending application·823 citations·filing 1985–2004
98Inventor score
Top patents by PatentIndex Score
29 records- 0196US5276706ASystem and method for minimizing frequency offsets between digital communication stationsHUGHES AIRCRAFT CO·Filed 1992·Granted Jan 4, 1994·192 cites·9 claims
- 0295US4825448ASubscriber unit for wireless digital telephone systemINT MOBILE MACHINES·Filed 1986·Granted Apr 25, 1989·82 cites·10 claims
- 0394US4893317ADigital signals and frequency correction in a digital wireless systemINT MOBILE MACHINES·Filed 1988·Granted Jan 9, 1990·60 cites·1 claims
- 0485US5008900ASubscriber unit for wireless digital subscriber communication systemINT MOBILE MACHINES·Filed 1989·Granted Apr 16, 1991·131 cites·8 claims
- 0578US5644602ADirect digital frequency synthesizer for use in a subscriber unit of a wireless digital communication systemINTERDIGITAL TECH CORP·Filed 1995·Granted Jul 1, 1997·16 cites·3 claims
- 0677US4881240AAM equalizer circuit for digital systemsINT MOBILE MACHINES·Filed 1988·Granted Nov 14, 1989·19 cites·5 claims
- 0777US4644561AModem for RF subscriber telephone systemINT MOBILE MACHINES·Filed 1985·Granted Feb 17, 1987·42 cites·24 claims
- 0875US6449317B1Digital synthesizerINTERDIGITAL TECH CORP·Filed 2000·Granted Sep 10, 2002·11 cites·10 claims
- 0970US4996697ADeglitching means for digital communication systemsINT MOBILE MACHINES·Filed 1988·Granted Feb 26, 1991·13 cites·1 claims
- 1069US5311545AModem for fading digital channels affected by multipathHUGHES AIRCRAFT CO·Filed 1991·Granted May 10, 1994·57 cites·17 claims
- 1169US5101418ADigital time-multiplexed quadrature frequency upconverterINT MOBILE MACHINES·Filed 1988·Granted Mar 31, 1992·13 cites·1 claims
- 1268US4764940AModem for RF subscriber telephone systemINT MOBILE MACHINES·Filed 1986·Granted Aug 16, 1988·28 cites·4 claims
- 1367US6587516B2Subscriber unit producing a modulated digital frequencyINTERDIGITAL TECH CORP·Filed 2002·Granted Jul 1, 2003·6 cites·3 claims
- 1467US5168507AAutomatic adaptive equalizerINT MOBILE MACHINES·Filed 1989·Granted Dec 1, 1992·22 cites·22 claims
- 1564US5159705AFrequency synthesizer circuitINT MOBILE MACHINES·Filed 1992·Granted Oct 27, 1992·13 cites·19 claims
- 1664US4994802ASubscriber unit for wireless digital telephone systemINT MOBILE MACHINES·Filed 1988·Granted Feb 19, 1991·14 cites·1 claims
- 1763US5146473ASubscriber unit for wireless digital subscriber communication systemINT MOBILE MACHINES·Filed 1991·Granted Sep 8, 1992·14 cites·8 claims
- 1858US6724851B2FIR chip for use in a wireless subscriber unitFiled 2003·Granted Apr 20, 2004·2 cites·7 claims
- 1956US5177741ASubscriber unit for wireless digital telephone systemINT MOBILE MACHINES·Filed 1988·Granted Jan 5, 1993·7 cites·2 claims
- 2051US5859883ASubscriber unit for wireless digital subscriber communication systemINTERDIGITAL TECH CORP·Filed 1997·Granted Jan 12, 1999·7 cites·7 claims
- 2151US4943983ASubscriber unit for wireless digital telephone systemINT MOBILE MACHINES·Filed 1988·Granted Jul 24, 1990·4 cites·1 claims
- 2250US5659576ABalanced processing based on receiver selectionHUGHES AIRCRAFT CO·Filed 1994·Granted Aug 19, 1997·19 cites·19 claims
- 2350US2004190645A1System for processing digitized communication signals provided over plural RF channelsINTERDIGITAL TECH CORP·Filed 2004·Application pending·0 cites
- 2445US6078629ADigital synthesizerINTERDIGITAL TECH CORP·Filed 1999·Granted Jun 20, 2000·9 cites·20 claims
- 2542US5067141AInterpolator for varying a signal sampling rateINT MOBILE MACHINE CORP·Filed 1989·Granted Nov 19, 1991·9 cites·7 claims
- 2641US5325396ASubscriber unit for wireless digital subscriber communication systemINTERDIGITAL TECH CORP·Filed 1992·Granted Jun 28, 1994·16 cites·32 claims
- 2736US5694430ASubscriber unit for wireless digital subscriber communication systemINTERDIGITAL TECH CORP·Filed 1996·Granted Dec 2, 1997·2 cites·16 claims
- 2836US5282226ASystem and method for transmission of bursts of digital informationHUGHES AIRCRAFT CO·Filed 1992·Granted Jan 25, 1994·14 cites·19 claims
- 2932US5842137ASubscriber unit for wireless digital telephone systemINTERDIGITAL TECH CORP·Filed 1994·Granted Nov 24, 1998·1 cites·38 claims
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