Process for the purification of tobacco smoke

Claim 1

A PROCESS FOR THE PURIFICATION OF TOBACCO SMOKE FROM THE BURNING, IN A SMOKING ARTICLE, OF CONVENTIONAL TOBACCO WHICH PRODUCES A SMOKE THAT MAY CONTAIN TRACE QUANTITIES OF TRANSITION METAL COMPOUNDS, WHICH METHOD COMPRISES PASSING SAID SMOKE THROUGH A FILTER INTO THE MOUTH OF THE USER DOWNSTREAM THEREFROM, SAID FILTER CONTAINING A BASE MATERIAL CARRYING A NON-TOXIC ORGANO-PHOSPHOROUS COMPOUND HAVING A METAL CHELATNIG LIGAND GROUPING, SAID COMPOUND BEING OTHER THAN TRI(NONYLPHENYL)-PHOSPHITE AND BEING ESSENTIALLY FREE OF ANIMAL PROTEIN SO AS TO BE STABLE AGAINST BACTERIAL SPOILAGE, AND BEING SELECTED FROM THE CLASS CONSISTING OF THE FOLLOWING GROUPS: (A) THE PHOSPHINES, PHOSPHITES AND PHOSPHATES HAVING THREE SUBSTITUENT RADICALS SELECTED FROM THE RADICALS OF GROUP I, SAID GROUP I CONSISTING OF THE FOLLOWING RADICALS: THE ALKYL, ALKENYL, ALKYNYL, CYCLOALKYL, TERPENYL, ARYL, ALKARYL, ALKOXYARYL, HALOARYL, ARALKYL, ARYLENE, MORPHOLINYL, PYRIDYL, ALKYLPYRIDYL, PYRROLYDINYL, PIPERAZINYL, QUINOLYL AND ISOQUINOLYL RADICALS WHICH CONTAIN NOT MORE THAN 18 CARBON ATOMS; (B) THE DIPHOSPHINES HAVING FOUR SUBSTITUENT RADICALS SELECTED FROM SAID GROUP I; (C) THE SOLID POLYPHOSPHITE COMPOUNDS HAVING THE FORMULA D(O3-XP(OR)X)S WHEREIN D IS A POLYVALENT POLYOL MOIETY, X IS 1 OR 2, S IS AN INTEGER FROM 2 TO 1000, AND THE R OF EACH OR GROUP IS SELECTED FROM SAID GROUP I; (D) THE AMINO-ALCOHOL ESTERS OF ACIDS OF PHOSPHOROUS; AND (E) THE PHOSPHATIDES.