Irwin D. McIlwain has been granted 19 US patents while listed as an inventor at Sperry. The first was granted in 1980 and the most recent in September 2012. Irwin D. McIlwain ranks #229,345 of 4,157,543 US inventors in our database (top 5.5%). Patent records list Irwin D. McIlwain in Lancaster, PA, US.