Inventor · disambiguated record
Joseph R. Littlefield
Also filed as: LITTLEFIELD JOSEPH R · LITTLEFIELD JOSEPH RALPH
21 granted patents·2 pending applications·122 citations·filing 2013–2020
94Inventor score
Top patents by PatentIndex Score
23 records- 0198US9840140B1Compound-power-split electrically variable transmissions with motor clutching devicesGM GLOBAL TECH OPERATIONS LLC·Filed 2016·Granted Dec 12, 2017·27 cites·20 claims
- 0296US10167906B2Clutch assembly having a hydraulically actuate piston and latching deviceGM GLOBAL TECH OPERATIONS LLC·Filed 2016·Granted Jan 1, 2019·8 cites·19 claims
- 0394US9950607B2Powertrain with multi-planetary, single motor drive unitGM GLOBAL TECH OPERATIONS LLC·Filed 2015·Granted Apr 24, 2018·22 cites·7 claims
- 0493US10300905B2Electric vehicle drive using combined differential and reduction gearingGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted May 28, 2019·15 cites·19 claims
- 0592US9574619B1Pawl grounding clutch with synchronizerGM GLOBAL TECH OPERATIONS LLC·Filed 2015·Granted Feb 21, 2017·5 cites·20 claims
- 0691US10982745B2Planetary differential drive systemGM GLOBAL TECH OPERATIONS LLC·Filed 2019·Granted Apr 20, 2021·6 cites·16 claims
- 0791US10533640B2Two ratio electric drive unitGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Jan 14, 2020·5 cites·21 claims
- 0889US10247252B2Dog clutch for a vehicle transmissionGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Apr 2, 2019·4 cites·18 claims
- 0987US10036458B2Multi-axis final drive assemblyGM GLOBAL TECH OPERATIONS LLC·Filed 2016·Granted Jul 31, 2018·7 cites·10 claims
- 1084US10377221B2Powertrain including modular drive unitGM GLOBAL TECH OPERATIONS LLC·Filed 2015·Granted Aug 13, 2019·5 cites·20 claims
- 1184US8813896B2VehicleGM GLOBAL TECH OPERATIONS INC·Filed 2013·Granted Aug 26, 2014·11 cites·20 claims
- 1281US10190643B2Synchronizer for radially applied dog clutch for a vehicleGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Jan 29, 2019·2 cites·18 claims
- 1381US10138947B2Radially applied dog clutch with bi-directional ratcheting for a vehicle transmissionGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Nov 27, 2018·2 cites·20 claims
- 1472US10557536B2Multi-axis final drive assemblyGM GLOBAL TECH OPERATIONS LLC·Filed 2018·Granted Feb 11, 2020·1 cites·6 claims
- 1570US10094427B2Ball cam actuated dog clutchGM GLOBAL TECH OPERATIONS LLC·Filed 2015·Granted Oct 9, 2018·1 cites·18 claims
- 1668US11035448B2Multi-axis final drive assemblyGM GLOBAL TECH OPERATIONS LLC·Filed 2020·Granted Jun 15, 2021·0 cites·16 claims
- 1767US10234019B2Planetary gear set bearing retainerGM GLOBAL TECH OPERATIONS LLC·Filed 2016·Granted Mar 19, 2019·1 cites·12 claims
- 1858US11383593B2Electric drive unit clutchGM GLOBAL TECH OPERATIONS LLC·Filed 2020·Granted Jul 12, 2022·0 cites·12 claims
- 1945US10124661B1Power-split hybrid powertrainGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Nov 13, 2018·0 cites·20 claims
- 2045US2020062114A1Electric motor transaxle with side-to-side torque controlGM GLOBAL TECH OPERATIONS LLC·Filed 2018·Application pending·0 cites
- 2140US10697524B2Motor vehicle powertrainGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Jun 30, 2020·0 cites·16 claims
- 2239US10500938B2Motor vehicle powertrainGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Dec 10, 2019·0 cites·18 claims
- 2339US2018112774A1Park control system for a vehicle transmissionGM GLOBAL TECH OPERATIONS LLC·Filed 2016·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →