Reaction products of esters of polyphosphoric acids and heavy metal oxides and method of making same

2016-08-242016-08-241951-03-13http://hdl.handle.net/10919/72407application/pdfen-USReaction products of esters of polyphosphoric acids and heavy metal oxides and method of making samePatenthttps://patentimages.storage.googleapis.com/pdfs/b461945546f9fac43949/US2544858.pdf3098175556/17556/14987/226A01N57/12C07F9/0982544858