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USPTO Patent Rankings Data through Dec 31, 2025
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Ellen Greifenstein — 2 Patents

General Motors: 2 patents #6,303 of 18,328Top 35%
Darmstadt, DE: #744 of 1,865 inventorsTop 40%
Overall (All Time): #1,709,992 of 4,157,543Top 45%
2 Patents All Time
Ellen Greifenstein has been granted 2 US patents while listed as an inventor at General Motors. The first was granted in 2010 and the most recent in January 2011. Ellen Greifenstein ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list Ellen Greifenstein in Darmstadt, DE.

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
7862943 Method and apparatus for starting a fuel cell engine in a vehicle equipped with an ultracapacitor Matthew K. Hortop, David J. Keyes, Kazuyuki Izawa, Kengo Ikeya 2011-01-04 $7,055,000
7716938 External control of a vehicle coolant pump with remote heating option Wolfgang Haege, Dirk Wexel, Jurgen Thyroff 2010-05-18