Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Ralph E. Christman — 6 Patents

WHWhirlpool: 6 patents #678 of 3,654Top 20%
Three Rivers, MI: #148 of 578 inventorsTop 30%
Michigan: #15,817 of 86,293 inventorsTop 20%
Overall (All Time): #779,687 of 4,157,543Top 20%
6 Patents All Time
Ralph E. Christman has been granted 6 US patents while listed as an inventor at Whirlpool. The first was granted in 1999 and the most recent in March 2007. Ralph E. Christman ranks #779,687 of 4,157,543 US inventors in our database (top 18.8%). Patent records list Ralph E. Christman in Three Rivers, MI, US.

Patents per Year

Patents granted per year, 1999 to 2007Bar chart with a peak of 1 patents in 1999.peak 11999: 1 patents19992000: 1 patents20002004: 1 patents20042005: 1 patents20052006: 1 patents20062007: 1 patents2007

Issued Patents All Time

Showing 1–6 of 6 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
7185664 Fill control system for an in sink dishwasher Ryan K. Roth 2007-03-06 $12,086,000
7028697 In-sink dishwasher Ryan K. Roth 2006-04-18 $36,323,000
6871653 Method for cleaning an in-sink dishwasher Arnold L. Denne, Rud J. Lauer 2005-03-29 $20,959,000
6742531 In-sink dishwater with self-aligning liquid feed system Arnold L. Denne, Rud J. Lauer 2004-06-01 $20,813,000
6138692 Cycle for a dishwasher to reduce filming Duane M. Kobos, Kenneth N. Whah, Tony Ellis, Ernst Grunewald 2000-10-31 $34,431,000
5881906 Wall construction for a silverware basket Pamela Sue Rogers 1999-03-16 $6,085,000