In May of this year INVISTA announced it had purchased Cone Denim’s dual core patent portfolio. The patent estate covers a broad variety of dual core yarns, fabrics, and garments made from those fabrics, which are sold in the US, China, and most recently, Europe. Since the purchase, INVISTA has been meeting individually with its denim customers and providing selected weavers with licenses to practice the technology. One of the requirements for granting of a license is that the mills agree to use branded INVISTA products such as LYCRA® and LYCRA® T400® fibres in their dual core fabrics.