'Duffin' battle over the doughnut-muffin hybrid
9 October 2013 Last updated at 21:41 BST
The owner of Bea's of Bloomsbury said she was shocked to discover that one of her most popular products has now been trademarked by a supplier for the coffee giant Starbucks.
The product has been nicknamed the "duffin" - a cross between a doughnut and a muffin.
Tarah Welsh spoke to Bea's of Bloomsbury founder Bea Vo and Carrollanne Lindley, trademark attorney at Kilburn & Strode.