Denis E. Keyes has been granted 16 US patents while listed as an inventor at E.R. Squibb & Sons.. The first was granted in 1988 and the most recent in August 2017. Denis E. Keyes ranks #284,196 of 4,157,543 US inventors in our database (top 6.8%). Patent records list Denis E. Keyes in Staten Island, NY, US.