Inventor · disambiguated record
David F. Willard
Also filed as: WILLARD DAVID F · WILLARD DAVID FRANK
33 granted patents·2,175 citations·filing 1975–1999
98Inventor score
Files withMOTOROLA INC33
Top patents by PatentIndex Score
33 records- 0197US5311516APaging system using message fragmentation to redistribute trafficMOTOROLA INC·Filed 1992·Granted May 10, 1994·380 cites·22 claims
- 0297US4803487APortable communications receiver with separate information presentation meansMOTOROLA INC·Filed 1987·Granted Feb 7, 1989·255 cites·40 claims
- 0392US4021653ADigital programmable tone detectorMOTOROLA INC·Filed 1975·Granted May 3, 1977·55 cites·26 claims
- 0490US4965569ADigitized stored voice paging receiverMOTOROLA INC·Filed 1989·Granted Oct 23, 1990·92 cites·23 claims
- 0589US4412217APager with visible display indicating status of memoryMOTOROLA INC·Filed 1981·Granted Oct 25, 1983·72 cites·12 claims
- 0688US5089813AMethod of super battery saving in a selective call receiverMOTOROLA INC·Filed 1989·Granted Feb 18, 1992·85 cites·12 claims
- 0786US4873520APaging receiver for storing digitized voice messagesMOTOROLA INC·Filed 1987·Granted Oct 10, 1989·83 cites·7 claims
- 0883US4385295APager with visible display indicating unread messagesMOTOROLA INC·Filed 1981·Granted May 24, 1983·43 cites·20 claims
- 0982US5455579ADigitized stored voice paging receiverMOTOROLA INC·Filed 1990·Granted Oct 3, 1995·73 cites·16 claims
- 1081US4914649AMultiple frequency message systemMOTOROLA INC·Filed 1988·Granted Apr 3, 1990·125 cites·20 claims
- 1180US5208833AMulti-level symbol synchronizerMOTOROLA INC·Filed 1991·Granted May 4, 1993·96 cites·20 claims
- 1277US4803703AApparatus and method for fine synchronization of a communication receiverMOTOROLA INC·Filed 1987·Granted Feb 7, 1989·109 cites·31 claims
- 1376US5206855AMultiple frequency message systemMOTOROLA INC·Filed 1990·Granted Apr 27, 1993·106 cites·15 claims
- 1471US5475863AMethod and apparatus for delivering messages to portable communication units in a radio communication systemMOTOROLA INC·Filed 1993·Granted Dec 12, 1995·87 cites·11 claims
- 1571US5325088ASynchronous selective signalling systemMOTOROLA INC·Filed 1991·Granted Jun 28, 1994·84 cites·24 claims
- 1665US5635914AMethod and apparatus for dynamic group calling in a selective call systemMOTOROLA INC·Filed 1995·Granted Jun 3, 1997·45 cites·6 claims
- 1764US5168493ATime division multiplexed selective call systemMOTOROLA INC·Filed 1991·Granted Dec 1, 1992·57 cites·22 claims
- 1860US5600312AMessaging system and method having roaming capability and controlled group messagingMOTOROLA INC·Filed 1995·Granted Feb 4, 1997·43 cites·12 claims
- 1958US5610919ANetwork identification information placement architecture for messaging system having roaming capabilityMOTOROLA INC·Filed 1995·Granted Mar 11, 1997·39 cites·16 claims
- 2057US5956640AMessaging system providing flexible roaming and method thereforMOTOROLA INC·Filed 1996·Granted Sep 21, 1999·37 cites·18 claims
- 2155US5546394AMessage fragmenting in a time diversity radio systemMOTOROLA INC·Filed 1994·Granted Aug 13, 1996·28 cites·25 claims
- 2253US5555183AMethod and apparatus for synchronizing to a synchronous selective call signalMOTOROLA INC·Filed 1994·Granted Sep 10, 1996·40 cites·4 claims
- 2353US5493282AAddressing method for conserving power in distributed information receiversMOTOROLA INC·Filed 1993·Granted Feb 20, 1996·21 cites·7 claims
- 2448US5051993AMixed modulation level communication systemMOTOROLA INC·Filed 1989·Granted Sep 24, 1991·13 cites·25 claims
- 2548US4103286ADigital binary group call circuitry arrangementMOTOROLA INC·Filed 1977·Granted Jul 25, 1978·9 cites·8 claims
- 2646US5625351AMessaging system having roaming capabilityMOTOROLA INC·Filed 1995·Granted Apr 29, 1997·24 cites·11 claims
- 2744US5682147AMethod and apparatus for selecting a receive frequency in a communication receiverMOTOROLA INC·Filed 1995·Granted Oct 28, 1997·22 cites·20 claims
- 2843US5371737ASelective call receiver for receiving a multiphase multiplexed signalMOTOROLA INC·Filed 1993·Granted Dec 6, 1994·20 cites·7 claims
- 2942US5686898APaging network identification information distributed in address fieldMOTOROLA INC·Filed 1995·Granted Nov 11, 1997·15 cites·11 claims
- 3039US6101370AMethod and apparatus used in a simulcast radio communication system for providing improved local timeMOTOROLA INC·Filed 1998·Granted Aug 8, 2000·6 cites·28 claims
- 3135US6229794B1Selective call device and method for monitoring at least two communication systemsMOTOROLA INC·Filed 1999·Granted May 8, 2001·6 cites·14 claims
- 3230US6477381B1Selective call receiver and method for detecting mandatory frames of a channel protocolMOTOROLA INC·Filed 1997·Granted Nov 5, 2002·3 cites·5 claims
- 3328US4151367AData sync acquisition in an asynchronous binary address decoderMOTOROLA INC·Filed 1977·Granted Apr 24, 1979·2 cites·7 claims
Join the waitlist — get patent alerts
Get an alert when David F. Willard files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →