Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Robert K. Mitchell — 43 Patents

BSBriggs & Stratton: 27 patents #8 of 502Top 2%
Honeywell: 4 patents #3,928 of 16,504Top 25%
GE: 3 patents #10,387 of 36,430Top 30%
Phoenix, AZ: #103 of 6,660 inventorsTop 2%
Arizona: #572 of 32,909 inventorsTop 2%
Overall (All Time): #69,380 of 4,157,543Top 2%
43 Patents All Time
Robert K. Mitchell has been granted 43 US patents while listed as an inventor at Briggs & Stratton. The first was granted in 1980 and the most recent in August 2018. Robert K. Mitchell ranks #69,380 of 4,157,543 US inventors in our database (top 1.7%). Patent records list Robert K. Mitchell in Phoenix, AZ, US.

Issued Patents All Time

Showing 1–25 of 43 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
10040046 Systems and methods of treating water used for hydraulic fracturing 2018-08-07
9688394 Roller-based drive systems with compliance for accommodating non-conjugate meshing Donald J. Christensen 2017-06-27 $18,200,000
9550564 Aircraft wheel driving system Donald J. Christensen 2017-01-24 $18,731,000
9499260 Aircraft landing gear wheel with integral gear drive Donald J. Christensen 2016-11-22 $16,074,000
9358517 Systems and methods of treating water used for hydraulic fracturing 2016-06-07
9157494 Centrifugal engagement and disengagement drive systems Allan Steves, James Knorr 2015-10-13 $11,001,000
8962534 Systems and methods of treating water used for hydraulic fracturing 2015-02-24
8448678 Water collection apparatus and method 2013-05-28
8347927 Water collection apparatus and method 2013-01-08
6983736 Governor stabilizer Richard A. Dykstra 2006-01-10 $9,728,000
6971369 Pressure assisted governor Richard W. Seilenbinder 2005-12-06 $8,674,000
6647942 Engine starting and stopping device Art Poehlman, Gary J. Gracyalny 2003-11-18 $5,893,000
6595176 Engine starting and stopping device Art Poehlman, Gary J. Gracyalny 2003-07-22 $2,862,000
6584964 Engine having a centrifugal oil separator Richard W. Seilenbinder 2003-07-01 $5,565,000
6386169 Starting and stopping device for internal combustion engine Gary J. Gracyalny, Art Poehlman, Richard A. Dykstra, Steven Dethloff, Charles Brown +6 more 2002-05-14 $5,195,000
D456051 Exercise device 2002-04-23
D451971 Exercise device 2001-12-11
6311663 Starting and stopping device for internal combustion engine Gary J. Gracyalny, Art Poehlman, Richard A. Dykstra, Steven Dethloff, Charles Brown +6 more 2001-11-06 $6,031,000
6263852 Starting and stopping device for internal combustion engine Gary J. Gracyalny, Art Poehlman, Richard A. Dykstra, Steven Dethloff, Charles Brown +6 more 2001-07-24 $7,550,000
6260529 Starting and stopping device for internal combustion engine Gary J. Gracyalny, Art Poehlman, Richard A. Dykstra, Steven Dethloff, Charles Brown +6 more 2001-07-17 $7,979,000
6237555 Spark blanking apparatus for an internal combustion engine Richard A. Dykstra, Gary J. Gracyalny 2001-05-29 $4,374,000
6239709 Liquid level sensor for internal combustion engine Richard A. Dykstra 2001-05-29 $4,374,000
6230678 Starting and stopping device for internal combustion engine Gary J. Gracyalny, Art Poehlman, Richard A. Dykstra, Steven Dethloff, Charles Brown +6 more 2001-05-15 $8,281,000
6145487 Automatic air inlet control system for an engine Richard A. Dykstra 2000-11-14 $7,895,000
6029619 Remote primer 2000-02-29 $5,879,000