This item sold on July 30, 2013.
Three plastic thermal tumblers by N. F. Cornelius. Pat Pend 3094448 on bottom of glasses. Cornelius applied for his patent on March 9, 1959 and was granted the patent on June 18, 1963. These copper exterior and white interior stand 6.25" tall and are in excellent condition. I only wish there were more of them.