Inventor · disambiguated record
Robert J. Littrell
Also filed as: LITTRELL ROBERT · LITTRELL ROBERT J · LITTRELL ROBERT JOHN
37 granted patents·12 pending applications·312 citations·filing 2009–2024
97Inventor score
Files withQUALCOMM TECHNOLOGIES INC19VESPER TECH INC15QUALCOMM INC6UNIV MICHIGAN REGENTS6GROSH KARL2
Top patents by PatentIndex Score
49 records- 0197US12058939B2Piezoelectric MEMS microphoneUNIV MICHIGAN REGENTS·Filed 2023·Granted Aug 6, 2024·2 cites·16 claims
- 0297US10001391B1Adjusting resonant frequencies based on feedback networksVESPER TECH INC·Filed 2015·Granted Jun 19, 2018·31 cites·16 claims
- 0397US9853201B2Piezoelectric MEMS microphoneUNIV MICHIGAN REGENTS·Filed 2014·Granted Dec 26, 2017·19 cites·22 claims
- 0497US8896184B2Piezoelectric MEMS microphoneUNIV MICHIGAN·Filed 2013·Granted Nov 25, 2014·37 cites·12 claims
- 0596US10964880B2Piezoelectric MEMS microphoneUNIV MICHIGAN REGENTS·Filed 2018·Granted Mar 30, 2021·15 cites·24 claims
- 0696US9055372B2Acoustic transducer with gap-controlling geometry and method of manufacturing an acoustic transducerGROSH KARL·Filed 2012·Granted Jun 9, 2015·52 cites·19 claims
- 0795US11363387B2Transducer system with configurable acoustic overload pointVESPER TECH INC·Filed 2021·Granted Jun 14, 2022·3 cites·6 claims
- 0895US10825982B1Piezoelectric micro-electro-mechanical systems (MEMS) device with a beam strengthening physical elementVESPER TECH INC·Filed 2015·Granted Nov 3, 2020·19 cites·19 claims
- 0995US10284960B2Acoustic transducer with gap-controlling geometry and method of manufacturing an acoustic transducerVESPER TECH INC·Filed 2015·Granted May 7, 2019·15 cites·20 claims
- 1095US10170685B2Piezoelectric MEMS microphoneUNIV MICHIGAN REGENTS·Filed 2014·Granted Jan 1, 2019·24 cites·12 claims
- 1194US11099078B1Acoustic sensor with temperature structureVESPER TECH INC·Filed 2018·Granted Aug 24, 2021·18 cites·31 claims
- 1294US8531088B2Piezoelectric MEMS microphoneGROSH KARL·Filed 2009·Granted Sep 10, 2013·42 cites·6 claims
- 1393US11899039B2Piezoelectric accelerometer with wake functionQUALCOMM TECHNOLOGIES INC·Filed 2022·Granted Feb 13, 2024·1 cites·20 claims
- 1493US10715922B2Piezoelectric mems device for producing a signal indicative of detection of an acoustic stimulusVESPER TECH INC·Filed 2017·Granted Jul 14, 2020·9 cites·21 claims
- 1592US11617048B2Microphone having a digital output determined at different power consumption levelsQUALCOMM TECHNOLOGIES INC·Filed 2020·Granted Mar 28, 2023·3 cites·17 claims
- 1690US12010488B2Microphone having a digital output determined at different power consumption levelsQUALCOMM TECHNOLOGIES INC·Filed 2023·Granted Jun 11, 2024·1 cites·13 claims
- 1790US11088315B2Piezoelectric MEMS microphoneUNIV MICHIGAN REGENTS·Filed 2017·Granted Aug 10, 2021·5 cites·13 claims
- 1888US11665968B2Piezoelectric MEMS microphoneUNIV MICHIGAN REGENTS·Filed 2021·Granted May 30, 2023·1 cites·25 claims
- 1985US11438706B2Robust MEMS microphoneVESPER TECH INC·Filed 2021·Granted Sep 6, 2022·2 cites·27 claims
- 2084US10917727B2Transducer system with configurable acoustic overload pointVESPER TECH INC·Filed 2019·Granted Feb 9, 2021·3 cites·18 claims
- 2182US2024295580A1Piezoelectric mems contact detection systemQUALCOMM INC·Filed 2024·Application pending·0 cites
- 2282US2024298108A1Piezoelectric microelectromechanical system (mems) signal processing for contact detectionQUALCOMM INC·Filed 2024·Application pending·0 cites
- 2381US12216746B2Biometric authentication using voice accelerometerQUALCOMM TECHNOLOGIES INC·Filed 2021·Granted Feb 4, 2025·2 cites·20 claims
- 2481US10566517B1Staggering of openings in electrodes for crack mitigationVESPER TECH INC·Filed 2015·Granted Feb 18, 2020·2 cites·14 claims
- 2580US11892466B2Piezoelectric accelerometer with wake functionQUALCOMM TECHNOLOGIES INC·Filed 2022·Granted Feb 6, 2024·0 cites·21 claims
- 2678US11418882B2Piezoelectric MEMS device with an adaptive threshold for detection of an acoustic stimulusVESPER TECH INC·Filed 2020·Granted Aug 16, 2022·2 cites·20 claims
- 2776US11716906B2MEMS process powerQUALCOMM TECHNOLOGIES INC·Filed 2022·Granted Aug 1, 2023·0 cites·21 claims
- 2875US11259124B2Acoustic transducer with gap-controlling geometry and method of manufacturing an acoustic transducerVESPER TECH INC·Filed 2019·Granted Feb 22, 2022·1 cites·12 claims
- 2975US10771889B2Acoustic filteringVESPER TECH INC·Filed 2016·Granted Sep 8, 2020·2 cites·18 claims
- 3075US2023422623A1Mems process powerQUALCOMM TECHNOLOGIES INC·Filed 2023·Application pending·0 cites
- 3174US12445782B2Piezoelectric mems device for producing a signal indicative of detection of an acoustic stimulusQUALCOMM INC·Filed 2023·Granted Oct 14, 2025·0 cites·27 claims
- 3273US11950052B2Acoustic transducer with gap-controlling geometry and method of manufacturing an acoustic transducerQUALCOMM TECHNOLOGIES INC·Filed 2022·Granted Apr 2, 2024·0 cites·15 claims
- 3371US11800299B2Transducer system with configurable acoustic overload pointQUALCOMM TECHNOLOGIES INC·Filed 2022·Granted Oct 24, 2023·0 cites·11 claims
- 3471US11217741B2MEMS process powerVESPER TECH INC·Filed 2016·Granted Jan 4, 2022·1 cites·18 claims
- 3570US11871664B1Staggering of openings in electrodes for crack mitigationQUALCOMM TECHNOLOGIES INC·Filed 2020·Granted Jan 9, 2024·0 cites·20 claims
- 3670US11726105B2Piezoelectric accelerometer with wake functionQUALCOMM TECHNOLOGIES INC·Filed 2020·Granted Aug 15, 2023·0 cites·22 claims
- 3769US2023270012A1Piezoelectric micromachined ultrasonic transducer (pmut) designQUALCOMM TECHNOLOGIES INC·Filed 2023·Application pending·0 cites
- 3869US2023270011A1Piezoelectric micromachined ultrasonic transducer (pmut) designQUALCOMM TECHNOLOGIES INC·Filed 2023·Application pending·0 cites
- 3965US11617041B2Piezoelectric MEMS device for producing a signal indicative of detection of an acoustic stimulusQUALCOMM TECHNOLOGIES INC·Filed 2020·Granted Mar 28, 2023·0 cites·20 claims
- 4064US11696078B2Robust MEMS microphoneQUALCOMM TECHNOLOGIES INC·Filed 2022·Granted Jul 4, 2023·0 cites·20 claims
- 4162US11930334B2Piezoelectric MEMS device with an adaptive threshold for detection of an acoustic stimulusQUALCOMM TECHNOLOGIES INC·Filed 2022·Granted Mar 12, 2024·0 cites·17 claims
- 4257US12405622B2Voltage detector in data communication interfaceQUALCOMM INC·Filed 2023·Granted Sep 2, 2025·0 cites·22 claims
- 4355US2022344571A1Piezoelectric Accelerometer with Wake FunctionVESPER TECH INC·Filed 2022·Application pending·0 cites
- 4450US2025142250A1Bone conduction microphone with resonance control based on determined audio context informationQUALCOMM INC·Filed 2023·Application pending·0 cites
- 4550US2025368499A1Microelectromechanical systems (mems) transducer overstress protectionQUALCOMM INC·Filed 2024·Application pending·0 cites
- 4649US2025056164A1Piezoelectric mems contact detection systemQUALCOMM TECHNOLOGIES INC·Filed 2023·Application pending·0 cites
- 4748US2023143656A1Acoustic transducer with improved low-frequency responseQUALCOMM TECHNOLOGIES INC·Filed 2022·Application pending·0 cites
- 4847US2023422624A1Low noise piezoelectric sensorsQUALCOMM TECHNOLOGIES INC·Filed 2021·Application pending·0 cites
- 4937US2019110132A1Plate SpringVESPER TECH INC·Filed 2016·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when Robert J. Littrell 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 →