Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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David Mayfield — 9 Patents

HEHess Engineering: 6 patents #1 of 4Top 25%
LFL.B. Foster: 1 patents #8 of 30Top 30%
South Bend, IN: #77 of 809 inventorsTop 10%
Indiana: #4,123 of 33,936 inventorsTop 15%
Overall (All Time): #535,341 of 4,157,543Top 15%
9 Patents All Time
David Mayfield has been granted 9 US patents while listed as an inventor at Hess Engineering. The first was granted in 1996 and the most recent in January 2016. David Mayfield ranks #535,341 of 4,157,543 US inventors in our database (top 12.9%). Patent records list David Mayfield in South Bend, IN, US.

Issued Patents All Time

Showing 1–9 of 9 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
9238419 Conductor rail Korhan Ciloglu 2016-01-19 $1,587,000
8225476 Method and apparatus for manufacturing a catalytic converter 2012-07-24
8122602 Sizing of mat material 2012-02-28
7963199 Vertical spinner Joseph Harry Krenz, Krishnathejan Akumalla 2011-06-21
7900352 Method and apparatus for manufacturing a catalytic converter 2011-03-08
7484297 Method and apparatus for manufacturing a catalytic converter 2009-02-03
6983632 Method and apparatus for spinning to a constant length 2006-01-10
6954988 Method and apparatus for manufacturing a catalytic converter 2005-10-18
D374115 Shape preserver brace for a baseball cap 1996-10-01