A lesson in patents, courtesy of a Real Housewives star and the creator of Spanx

This is just the latest salvo in an increasingly heated war over fashion design

Heather Thomson founder of Yummie Tummie at a Bloomingdale's event last year.
(Image credit: Skip Bolen/Getty Images for Bloomingdale's)

A legal battle between Heather Thomson, CEO of shapewear brand Yummie Tummie and co-star of The Real Housewives of New York City, and Sara Blakely, creator of Spanx and personal savior of women the world over, is raising a lot of questions about design patents — especially in the fashion world.

In January, Real Housewife Thomson sent Blakely a cease-and-desist letter, demanding that the Spanx creator discontinue three slimming tank tops that allegedly copy Yummie Tummie's patented three-panel design. Blakely, who Forbes just crowned America's youngest self-made billionaire, hit back, contending that her tanks don't violate any patents and asking a judge to rule on the matter. Thomson retaliated this month with a patent infringement complaint, telling Women's Wear Daily: "I hope [Blakely is] ready for war, because I will not lie down."

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Carmel Lobello is the business editor at TheWeek.com. Previously, she was an editor at DeathandTaxesMag.com.