John L. Ingraham has been granted 3 US patents while listed as an inventor at Iris Graphics. The first was granted in 1994 and the most recent in April 1997. John L. Ingraham ranks #1,328,092 of 4,157,543 US inventors in our database (top 31.9%). Patent records list John L. Ingraham in North Chelmsford, MA, US.