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Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Earl Mark — 3 Patents

SPSparton: 3 patents #5 of 62Top 9%
DeLand, FL: #45 of 196 inventorsTop 25%
Florida: #16,773 of 67,251 inventorsTop 25%
Overall (All Time): #1,328,092 of 4,157,543Top 35%
3 Patents All Time
Earl Mark has been granted 3 US patents while listed as an inventor at Sparton. The first was granted in 2014 and the most recent in December 2017. Earl Mark ranks #1,328,092 of 4,157,543 US inventors in our database (top 31.9%). Patent records list Earl Mark in DeLand, FL, US.

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
9841145 Axial piercing mechanism for pressurized gas canister David James Powell, Keith Huber, Taylor Durrance 2017-12-12 $1,913,000
9612085 Payload launch system and method David James Powell, Keith Huber, Taylor Durrance, Tanner Sizemore, Charles M. Nowell 2017-04-04 $1,456,000
8662441 Unmanned aerial vehicle launch system David James Powell, John T. Houck, Keith Huber 2014-03-04 $2,400,000