US Patent 3,574,791 for Scotchgard technology granted.
On April 13, 1971, Patsy O'Connell Sherman and her colleague Samuel Smith were granted US Patent 3,574,791 for Scotchgard. This patent secured their invention of a block and graft copolymer that repels oil and water on fabric. Scotchgard became one of the most well-known and successful stain-resistant products worldwide, illustrating Sherman's substantial impact on consumer products and fabric technology.