Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Duane Powell — 4 Patents

PTPowell Technologies: 3 patents #3 of 5Top 60%
Alma, MI: #8 of 40 inventorsTop 20%
Michigan: #22,248 of 86,293 inventorsTop 30%
Overall (All Time): #1,080,739 of 4,157,543Top 30%
4 Patents All Time
Duane Powell has been granted 4 US patents while listed as an inventor at Powell Technologies. The first was granted in 2007 and the most recent in January 2014. Duane Powell ranks #1,080,739 of 4,157,543 US inventors in our database (top 26.0%). Patent records list Duane Powell in Alma, MI, US.

Patents per Year

Patents granted per year, 2007 to 2014Bar chart with a peak of 1 patents in 2007.peak 12007: 1 patents20072009: 1 patents20092013: 1 patents20132014: 1 patents2014

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
8623318 Manufacture of high-strength, low-salt aqueous sodium hypochlorite bleach and substantially dry crystalline salt Robert B. Bebow, Brent J. Hardman 2014-01-07 $4,871,000
8491864 Manufacture of high-strength, low-salt sodium hypochlorite bleach Robert B. Bebow, Brent J. Hardman 2013-07-23 $4,257,000
7578991 Concurrent low-pressure manufacture of hypochlorite 2009-08-25 $6,528,000
7175824 Manufacture of high-strength, low-salt sodium hypochlorite bleach Robert B. Bebow, Brent J. Hardman 2007-02-13