Patterson Mold & Tool was founded in 1978 by Stan and Ralph Patterson. They set up shop in downtown St. Louis with 4 employees (including themselves) in a 3,100 sq. ft. building.

After two moves to larger facilities, they built the present special purpose building (38,000 sq. ft.) in 1995. Following building expansions in 2013 and 2015, the facility now encompasses over 51,500 sq. ft. The company presently employs 90+ employees and is now a division of Pace Industries.

The firm has kept current with technology and equipment; it has moved with the market trends to keep it a viable, engaged, and cost-effective tool shop.