In the years between the wars, he continued travelling and inventing. In 1934 he was granted a French patent related to the "Coandă Effect". During early 1930 he used the same principle as the basis for the design of a disc-shaped aircraft called "Aerodina Lenticulară" (lens-shaped aerodyne), a "flying saucer" shaped aircraft that used an unspecified source of high-pressure gases to flow through a ring-shaped vent system. In 1936 Coandă applied for a patent for his design. No practical full-scale version was built.