Patent 7588137 was granted and assigned to Laitram (company) on September, 2009 by the United States Patent and Trademark Office.
In one embodiment, a conveyor belt includes multiple roller sets, each roller set including a first roller and a second roller, the first and second rollers being placed in contact with each other such that driving of one of the rollers in a first angular direction causes rotation of the other roller in a second, opposite angular direction.