Oblon, Fisher, Spivak, McClelland & Maier
Process for removing calcium oxalate scale
 A scale containing calcium oxalate as a main component which is adhered on an inner wall of an apparatus is easily removed by contacting it with an aqueous solution containing (1) aluminum ions and/or ferric ions and (2) anions of acid. 
Nissan Chemical Industries Ltd.
C
C23G
inventional
Toshiki Masayoshi Kazuhiko
Mori Kotake Hayakawa