Flameless impingement oven (IMAGE) University of Wisconsin Oshkosh Caption Prototype of the flameless impingement oven built by Pawel Olszewski in the engineering and engineering technology department at UW Oshkosh. Olszewski recently was granted a U.S. patent for the oven, which mixes air and flammable gas in such a way that it creates heat without visible flame. Credit UW Oshkosh photo Usage Restrictions Permission to use photo with credit to UW Oshkosh License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.