Tobacco smoke filter

• US 3,251,365 A
• Filed: 03/04/1963
• Issued: 05/17/1966
• Est. Priority Date: 03/04/1963
• Status: Expired due to Term

• Current Assignee: Charles H. Keith II, William W. Bates Jr
• Original Assignee: Charles H. Keith II, William W. Bates Jr
• Inventors: KEITH II CHARLES H, Bates, William W. Jr.
• Application Number:
  US04/262,653
• Time in Patent Office: 1,170 Days
• US Class Current: 131/344
• CPC Class Codes: A24D 3/14 of organic materials as additive of ion exchange materials A24D3/12
• CPC Class Codes: A24D 3/16 of inorganic materials
• CPC Class Codes: A24D 3/163 Carbon
• CPC Class Codes: B01J 20/00 Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
• CPC Class Codes: B01J 20/28004 Sorbent size or size distribution, e.g. particle size
• CPC Class Codes: B01J 20/2803 Sorbents comprising a binder, e.g. for forming aggregated, agglomerated or granulated products
• CPC Class Codes: B01J 20/28066 being more than 1000 m2/g
• CPC Class Codes: C01B 32/348 Metallic compounds
• CPC Class Codes: C01B 32/384 Granulation

Claims

1. A SMOKING ARTICLE HAVING A BURNABLE TOBACCO CHARGE, A MOUTH END AND A FILTER INTERPOSED BETWEEN SAID TOBACCCO CHARGE AND SAID MOUTH END, SAID FILTER COMPRISING FILTER MATERIAL CONSISTING ESSENTIALLY OF NON-TOXIC ADSORBENT GRANULES SELECTED FROM THE GROUP CONSISTING OF ACTIVATED CHARCOAL, ALUMINA, NATURAL AND SYNTHETIC CLAYS AND SILICA GEL HAVING A SPECIFIC SURFACE AREA EXCEEDING A MILLION SQUARE CENTIMETERS PER GRAM, A PARTICLE SIZE BETWEEN 8 TO 50 MESH, AND IMPREGNATED WITH ABOUT 1% TO 13% BY WEIGHT THEREOF OF AN OXIDE SELECTED FROM THE GROUP CONSISTING OF IRON AND ZINC OXIDES, PLUS AT LEAST 1% OF THE OTHER (NON-SELECTED) OXIDE IN SAID GROUP, SAID OXIDES BEING IN FINELY-DIVIDED FORM AND TOGETHER PRESENT IN AN AMOUNT NOT EXCEEDING ABOUT 14% OF THE WEIGHT OF THE ADSORBENT GRANULES, SAID FILTER BEING DESIGNED TO REMOVE HYDROGEN CYANIDE AND HYDROGEN SULFIDE FROM TOBACCO SMOKE.