Inventor · disambiguated record
Ellen Greifenstein
Also filed as: GREIFENSTEIN ELLEN
2 granted patents·15 citations·filing 2006–2008
51Inventor score
Files withGM GLOBAL TECH OPERATIONS INC2
Top patents by PatentIndex Score
2 records- 0189US7862943B2Method and apparatus for starting a fuel cell engine in a vehicle equipped with an ultracapacitorGM GLOBAL TECH OPERATIONS INC·Filed 2008·Granted Jan 4, 2011·15 cites·17 claims
- 0244US7716938B2External control of a vehicle coolant pump with remote heating optionGM GLOBAL TECH OPERATIONS INC·Filed 2006·Granted May 18, 2010·0 cites·19 claims
Join the waitlist — get patent alerts
Get an alert when Ellen Greifenstein 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 →