Inventor
Joseph R. Littlefield
Inventor
Sterling Heights, MI, US
Overview
Patents· 20 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
F16Hprimary
F16HGearing25%
B60KArrangement or mounting of propulsion units or of transmissions in vehicles20%
Y02TClimate change mitigation technologies related to transportation17%
B60YIndexing scheme relating to aspects cross-cutting vehicle technology12%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests11%
F16DCouplings for transmitting rotation9%
B60LPropulsion of electrically-propelled vehicles3%
B60WConjoint control of vehicle sub-units of different type or different function2%
Y10TTechnical subjects covered by former us classification2%
PatentTitleYear
11,035,448Multi-axis final drive assembly202110,982,745Planetary differential drive system202110,697,524Motor vehicle powertrain202010,557,536Multi-axis final drive assembly202010,533,640Two ratio electric drive unit202010,500,938Motor vehicle powertrain201910,377,221Powertrain including modular drive unit201910,300,905Electric vehicle drive using combined differential and reduction gearing201910,247,252Dog clutch for a vehicle transmission201910,234,019Planetary gear set bearing retainer201910,190,643Synchronizer for radially applied dog clutch for a vehicle201910,167,906Clutch assembly having a hydraulically actuate piston and latching device201910,138,947Radially applied dog clutch with bi-directional ratcheting for a vehicle transmission201810,124,661Power-split hybrid powertrain201810,094,427Ball cam actuated dog clutch201810,036,458Multi-axis final drive assembly20189,950,607Powertrain with multi-planetary, single motor drive unit20189,840,140'Compound-power-split electrically variable transmissions with motor clutching devices'20179,574,619'Pawl grounding clutch with synchronizer'20178,813,896'Vehicle'2014Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
2014Patents assigned to GM GLOBAL TECH OPERATIONS INC (1)· patent assignee history
2014–2019Based in Waterford, MI, US· patent location history
2017–2021Patents assigned to GM GLOBAL TECH OPERATIONS LLC (19)· patent assignee history
2017–2021Based in Sterling Heights, MI, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| GM GLOBAL TECH OPERATIONS LLC | 19 | 2017–2021 |
| GM GLOBAL TECH OPERATIONS INC | 1 | 2014 |
Locations
| Location | Patents | Span |
|---|---|---|
| Sterling Heights, MI, US | 17 | 2017–2021 |
| Waterford, MI, US | 3 | 2014–2019 |