Harold D. Schofield has been granted 10 US patents while listed as an inventor at Datacard. The first was granted in 1991 and the most recent in July 2000. Harold D. Schofield ranks #481,000 of 4,157,543 US inventors in our database (top 11.6%). Patent records list Harold D. Schofield in Narragansett, RI, US.