Patent Leaderboard
USPTO Patent Rankings Data through Sept 30, 2025
NF

Norman Freeman

HYHydrogenics: 4 patents #15 of 85Top 20%
Toronto, CA: #2,026 of 9,482 inventorsTop 25%
Overall (All Time): #1,252,496 of 4,157,543Top 35%
4 Patents All Time

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDate
7425832 System and method for measuring internal resistance of electrochemical devices Ravi Gopal 2008-09-16
7148654 Method and apparatus for monitoring fuel cell voltages Stephen Burany, Ravi Gopal, Stephane Masse 2006-12-12
6816797 System and method for measuring fuel cell voltage and high frequency resistance Stephane Masse, Ravi Gopal 2004-11-09
6519539 Measurement of fuel cell impedance Stephane Masse, Ravi Gopal, Pierre Rivard 2003-02-11