Rama IX is possibly the only monarch holding patents. He was granted one in 1993 for a waste water aerator named "Chai Pattana". He has also been awarded several patents for rainmaking since 1955: The so-called "sandwich" rainmaking patent in 1999 and the "supersandwich" patent in 2003. He was granted European Patent # 1491088 on October 12, 2005 for "Royal Rainmaking Technology".