https://patentbrief.org/company/ei-du-pont-de-nemours-and-co Plain-English explanations of patents assigned to EI Du Pont de Nemours and Co, newest first. en-us Sun, 12 Jul 2026 09:34:30 GMT https://patentbrief.org/patent/us/3819587/kevlar-aramid-fiber-kwolek Stephanie Kwolek's 1971 patent for DuPont describing the molecular alignment and manufacturing of extremely strong, lightweight synthetic aramid fibers, which became famous as Kevlar. Tue, 25 Jun 1974 00:00:00 GMT https://patentbrief.org/patent/us/3819587/kevlar-aramid-fiber-kwolek https://patentbrief.org/patent/us/3733309/pet-plastic-bottle A 1970s invention that describes how to make lightweight, clear plastic bottles strong enough to hold carbonated drinks without exploding. Tue, 15 May 1973 00:00:00 GMT https://patentbrief.org/patent/us/3733309/pet-plastic-bottle https://patentbrief.org/patent/us/3671542/kevlar-aramid-fiber A 1969 chemical discovery describing a specialized liquid mixture that allows for the creation of incredibly strong, high-performance synthetic fibers. Tue, 20 Jun 1972 00:00:00 GMT https://patentbrief.org/patent/us/3671542/kevlar-aramid-fiber https://patentbrief.org/patent/us/2929804/spandex-lycra-elastic-fiber DuPont's 1960 patent for a stretchy, durable synthetic fiber made from segmented polymers, which became the foundation for modern Spandex. Tue, 22 Mar 1960 00:00:00 GMT https://patentbrief.org/patent/us/2929804/spandex-lycra-elastic-fiber https://patentbrief.org/patent/us/2130523/nylon-polyamide-carothers The foundational 1935 patent for synthetic linear polyamides, the chemical process that created the material we now call nylon. Tue, 20 Sep 1938 00:00:00 GMT https://patentbrief.org/patent/us/2130523/nylon-polyamide-carothers https://patentbrief.org/patent/us/1967861/neoprene-synthetic-rubber A 1934 patent describing the chemical process to turn chlorobutadiene into a durable, oil-resistant synthetic rubber known as Neoprene. Tue, 24 Jul 1934 00:00:00 GMT https://patentbrief.org/patent/us/1967861/neoprene-synthetic-rubber