Answered By: Regan Brumagen Last Updated: Nov 14, 2016 Views: 35
According to a Corning Glass Works report from 1965, Corning Glass Works' earliest patent filed was for a semaphore lens, held by C.F. Houghton and dated February 20, 1877. (Patent # 187, 631.) The lens was designed to be resistant to breakage caused by the heat from lamp flames.