US Patent 7784145 Roller surface insert

A removable roller surface insert for use with a container of rollable liquid. The insert may, in one embodiment, include a roller surface having an upper edge, and an upper contact portion attached to the roller surface at or near the upper edge. The upper contact portion may be configured to contact an inner sidewall surface of the container at or near the upper rim. All, or substantially all, of the insert may be, when the insert is in a use position, located within a first half of the container, the first half defined by a vertical plane passing through a centerline of the container.