# EI Du Pont de Nemours and Co — Patents explained on PatentBrief

EI Du Pont de Nemours and Co has 6 landmark patents explained in plain English on PatentBrief.

- [The Molecular Structure of Kevlar High-Strength Fiber](https://patentbrief.org/patent/us/3819587/kevlar-aramid-fiber-kwolek) — granted 1974
  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.
- [How Plastic Soda Bottles Are Made Stronger Using Stretched Molecules](https://patentbrief.org/patent/us/3733309/pet-plastic-bottle) — granted 1973
  A 1970s invention that describes how to make lightweight, clear plastic bottles strong enough to hold carbonated drinks without exploding.
- [How Stephanie Kwolek Invented the Liquid Crystal Solution for Kevlar](https://patentbrief.org/patent/us/3671542/kevlar-aramid-fiber) — granted 1972
  A 1969 chemical discovery describing a specialized liquid mixture that allows for the creation of incredibly strong, high-performance synthetic fibers.
- [How Spandex Elastic Fibers Are Chemically Engineered](https://patentbrief.org/patent/us/2929804/spandex-lycra-elastic-fiber) — granted 1960
  DuPont's 1960 patent for a stretchy, durable synthetic fiber made from segmented polymers, which became the foundation for modern Spandex.
- [How Wallace Carothers Invented Nylon](https://patentbrief.org/patent/us/2130523/nylon-polyamide-carothers) — granted 1938
  The foundational 1935 patent for synthetic linear polyamides, the chemical process that created the material we now call nylon.
- [How DuPont Invented Neoprene Synthetic Rubber](https://patentbrief.org/patent/us/1967861/neoprene-synthetic-rubber) — granted 1934
  A 1934 patent describing the chemical process to turn chlorobutadiene into a durable, oil-resistant synthetic rubber known as Neoprene.

**Full profile:** https://patentbrief.org/company/ei-du-pont-de-nemours-and-co

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_Source: PatentBrief — https://patentbrief.org. Plain-English explanations of US patents._