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Home › Active Control Experts › Douglas A. Simpson
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Douglas A. Simpson — 2 Patents

AEActive Control Experts: 2 patents #14 of 26Top 55%
Cambridge, MA: #3,974 of 8,183 inventorsTop 50%
Massachusetts: #42,563 of 88,656 inventorsTop 50%
Overall (All Time): #1,709,992 of 4,157,543Top 45%
2 Patents All Time
Douglas A. Simpson has been granted 2 US patents while listed as an inventor at Active Control Experts. The first was granted in 2001 and the most recent in August 2002. Douglas A. Simpson ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list Douglas A. Simpson in Cambridge, MA, US.

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
6427812 Damper and valve Edward F. Crawley, Kenneth B. Lazarus, Jeffrey W. Moore, Gerald F. Caron, Farla M. Russo 2002-08-06
6193029 Damper and valve Edward F. Crawley, Kenneth B. Lazarus, Jeffrey W. Moore, Gerald F. Caron, Farla M. Russo 2001-02-27

Frequent Collaborators

Jeffrey W. Moore2 shared
Edward F. Crawley2 shared
Kenneth B. Lazarus2 shared
Gerald F. Caron2 shared
Farla M. Russo2 shared

Nearby-Ranked Inventors

Leonard Mattheis2
Yiqi SHI2
Roberto DiCecco2
Haoneng Xu2
Emily Chew2
So Young Bae2
Julian Alexander Georgi2
Yoshihiro Asahara2
Assaf Ariel2