Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
PD

Peter Dufresne — 6 Patents

UNUnknown: 1 patents #29,356 of 83,584Top 40%
Calgary, CA: #651 of 5,407 inventorsTop 15%
Overall (All Time): #779,687 of 4,157,543Top 20%
6 Patents All Time
Peter Dufresne has been granted 6 US patents while listed as an inventor at Unknown. The first was granted in 1997 and the most recent in February 2021. Peter Dufresne ranks #779,687 of 4,157,543 US inventors in our database (top 18.8%). Patent records list Peter Dufresne in Calgary, AB, CA.

Patents per Year

Patents granted per year, 1997 to 2021Bar chart with a peak of 2 patents in 1998.peak 21997: 1 patents19971998: 2 patents19982001: 1 patents20012013: 1 patents20132021: 1 patents2021

Issued Patents All Time

Showing 1–6 of 6 patents

Patent #TitleCo-InventorsDate
10926243 Highly porous lubricant conditioning and remediation media Matthew Hobbs 2021-02-23
8468749 Gate entry system 2013-06-25
6287047 Roadway water ramp apparatus 2001-09-11
5785861 Regeneration of perchloroethylene 1998-07-28
5755527 Roadway water ramp apparatus 1998-05-26
5661117 Regeneration of phosphate ester lubricating fluids 1997-08-26