US Patent 9314078 Universal compatible phone or tablet case using stretchable polymer

A universal case has a single, unitary, elastic body of flexible and resilient material that can stretch to cover both smaller and larger mobile devices. The body has a side wall, a front perimeter lip, a rear perimeter lip and a web defining a cavity and being integral with one another and formed together from the flexible and resilient material as the single, unitary, elastic body. The side wall, the front perimeter lip and the rear perimeter lip define a perimeter channel to extend around a perimeter of the mobile device. The front perimeter lip defines a cavity and has corner lips with a wider width to define corner pockets. A groove is disposed in the channel, and extends into an inner surface of the side wall.