U.S. Patent 3,819,587 for Kevlar was issued to DuPont with Kwolek as an inventor.
On June 25, 1974, the U.S. Patent Office issued Patent 3,819,587, titled "Fiber having high modulus and tensile strength," to DuPont. This patent covered Kevlar aramid fibers, a revolutionary material invented by Stephanie Kwolek and her team. Kevlar’s development was significant in materials science because it introduced a fiber five times stronger than steel by weight. The implications of this breakthrough were profound, directly affecting industries such as law enforcement, military, and aerospace through the production of lightweight yet exceptionally strong and heat-resistant materials.
Kwolek’s contribution to the development of Kevlar granted her an esteemed place in history as an innovator who transcended traditional female roles in science, breaking barriers in a male-dominated industry during the mid-20th century.