Progress continues after product is on the market. Moisture proof cellophane was developed three years after DuPont had plain film. Today there are more than 50 types and 5,000 uses for sheets like that inspected in Buffalo research laboratory by Hal Charch, inventor, and chemist Russell Clark and Jim Mitchell.
Aerial view of the DuPont Company's Clinton, Iowa cellophane plant. This plant started production in 1941, was substantially enlarged in 1947 and today is being still further expanded.
