US Patent RE39256 Drum cooker

A drum cooker for cooking granular products comprises a vessel mounted to rotate about an axis. At least two nozzle groups are provided opening into said vessel. One of said nozzle groups is arranged in that it opens into a first area of said vessel covered by that granular product. A second nozzle group opens into a second area of said vessel not covered by said granular product. For enhancing the quality of the cooking process, a control means is provided for supplying said gaseous heat-carrying medium at any time to said nozzle group only that opens into that first area covered by said product.