John L. de Ris has been granted 7 US patents while listed as an inventor at Factory Mutual Research . The first was granted in 1987 and the most recent in April 2010. John L. de Ris ranks #680,018 of 4,157,543 US inventors in our database (top 16.4%). Patent records list John L. de Ris in Sharon, MA, US.
Patents per Year Patents granted per year, 1987 to 2010 Bar chart with a peak of 2 patents in 2002. peak 2 1987: 1 patents 1987 1993: 1 patents 1993 2002: 2 patents 2002 2005: 2 patents 2005 2010: 1 patents 2010
Issued Patents All Time
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Showing 1–7 of 7 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
7699116 Anti-skipping sprinkler Hong Yu , Benjamin D. Ditch 2010-04-20
$47,057,000
6971792 Device and method for measuring absorbed heat flux in a fire test apparatus Mohammed Mahmoud Abdulkader KHAN 2005-12-06
$9,290,000
6862941 Heat flux measurement pipe and method for determining sprinkler water delivery requirement Ronald L. Alpert , Lawrence Orloff 2005-03-08
$15,895,000
6499357 Heat flux measurement pipe and method for determining sprinkler water delivery requirement Ronald L. Alpert , Lawrence Orloff 2002-12-31
6367560 Wet sprinkler system for cold environments Joseph Hankins , Wayne H. Wilke 2002-04-09
5248252 Enhanced radiant output burner Michael A. Delichatsios 1993-09-28
4637735 Bench-scale material flammability test apparatus and process for measuring flammability George H. Markstein 1987-01-20