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Stephen T. Barnum — 2 Patents

BOBorgwarner: 2 patents #505 of 1,600Top 35%

Portage, MI: #312 of 619 inventorsTop 55%

Michigan: #35,034 of 86,293 inventorsTop 45%

Overall (All Time): #2,141,092 of 4,157,543Top 55%

2 Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
7628262	Electrical activation of a viscous clutch	Michael Tuttle	2009-12-08
7178648	Electrical activation of a viscous clutch	Michael Tuttle	2007-02-20