In 1941 a subsidiary company, Gas Transport, Inc., was founded. This company maintained gas pipelines to provide natural gas to several of the plants. It was also in this year that the closure plant in Long Island City, New York, was moved to Connelsville, Pennsylvania.

West Coast expansion was continued with the purchase of Maywood Glass in 1942. Another new market was penetrated in 1944 when the company entered the toiletries and cosmetic container field with the acquisition of the Baltimore, Maryland based Carr-Lowrey Glass Company.

Growth continued during the decade of the 1950's as the first unit of the Research and Development Center, the Package Research Laboratory, was established in Lancaster. In 1954 the expansion continued into a new geographical area with the addition of the Tropical Glass and Box Company of Jacksonville, Florida.
Anchor Hocking built its first new glass container manufacturing facility in San Leandro, California in 1959, thus providing the company with additional geographical distribution of glass container manufacturing facilities in the Northern California area.