Cigarette filter

Abstract

A cigarette filter for removing nicotine and tar from cigarette smoke is composed a filtering core ( 20 ) enclosed between the tube ( 10 ) and a mouth piece ( 30 ). Multiple gaps and passages and a residue chamber ( 15 ) are individually formed between the filtering core ( 20 ) and the tube ( 10 ). Multiple inlets ( 24 ) are defined in the filtering core ( 20 ) to communicate with the tube ( 10 ), and multiple outlets ( 26 ) are defined in the filtering core ( 20 ) to communicate between the inlets ( 24 ) and the residue chamber ( 15 ). When cigarette smoke passes through the filter core ( 20 ), nicotine and tar are deposited inside the inlets ( 24 ), outlets ( 26 ) and the residue chamber ( 15 ) because they have a larger specific gravity than the other gas in the cigarette smoke.

What is claimed is:  
     
         1 . A cigarette filter adapted to hold a cigarette comprising: 
 a tube ( 10 ) with two ends having an inner through hole and adapted to receive a cigarette inside the inner through hole at one end;    a filtering core ( 20 ) received inside the inner through hole at the other end of the tube ( 10 ) and having an outer diameter smaller than an inner diameter of the inner through hole so that a narrow gap is formed between the tube ( 10 ) and the filtering core ( 20 ), the filtering core ( 20 ) having an inlet end, an outlet end, multiple inlets ( 24 ) defined in the inlet end, multiple outlets ( 26 ) defined near the outlet end and a channel ( 25 ) axially defined in the filtering core ( 20 ) from the inlets ( 24 ) through the outlets ( 26 ) to the outlet end; and    a mouth piece ( 30 ) attached to the tube ( 10 ) to enclose the filtering core ( 20 ) inside the inner through hole;    whereby when cigarette smoke flows through the tube ( 10 ) and into the filtering core ( 20 ), nicotine and tar are deposited inside the inlets ( 24 ), the channel ( 25 ) and the outlets ( 26 ) because the specific gravity of the nicotine and tar is larger than that of the other gases in the smoke.    
     
     
         2 . The cigarette filter as claimed in  claim 1 , wherein the tube ( 10 ) has an inner surface, and an annular lip ( 11 ) is formed on the inner surface to divide the inner through hole of the tube ( 10 ) into a cigarette recess ( 13 ) and a core recess ( 14 ); 
 a hole ( 12 ) defined by the annular lip ( 11 ) so that the cigarette recess ( 13 ) communicates with the core recess ( 14 );    the filtering core ( 20 ) further has a first annular seat ( 21 ) defined near the inlet end close to the annular lip ( 11 ) and a second annular seat ( 22 ) defined near the outlet end to divide the narrow gap into a middle segment (B) and two end sections (A, C);    an O-ring ( 210 ,  220 ) is mounted in each annular seat ( 21 ,  22 ) to seal the middle segment (B) from the two end sections (A, C); and    a neck ( 23 ) is defined between the first and second annular seats ( 21 ,  22 ) to form a residue chamber ( 15 ) to collect nicotine and tar.    
     
     
         3 . The cigarette filter as claimed in  claim 1 , wherein the filtering core ( 20 ) further has a threaded nipple ( 27 ) formed on the outlet end and extending toward the mouth piece ( 30 ); and 
 the mouth piece ( 30 ) has a cylindrical protrusion ( 33 ) and a hollow bite ( 34 ), wherein the cylindrical protrusion ( 33 ) is tightly engaged inside the tube ( 10 ); and a threaded hole ( 31 ) is defined in the cylindrical protrusion ( 33 ) to communicate with the channel ( 25 ) to engage with the threaded nipple ( 27 ) of the filtering core ( 20 ).    
     
     
         4 . The cigarette filter as claimed in  claim 2 , wherein the filtering core ( 20 ) further has a threaded nipple ( 27 ) formed on the outlet end and extending toward the mouth piece ( 30 ); and 
 the mouth piece ( 30 ) has a cylindrical protrusion ( 33 ) and a hollow bite ( 34 ), wherein the cylindrical protrusion ( 33 ) is tightly engaged inside the tube ( 10 ) inside the core recess ( 14 ); and a threaded hole ( 31 ) is defined in the cylindrical protrusion ( 33 ) to communicate with the channel ( 25 ) to engage with the threaded nipple ( 27 ) of the filtering core ( 20 ).    
     
     
         5 . The cigarette filter as claimed in  claim 1 , wherein the filtering core ( 20 ) has six inlets ( 24 ) radially defined in the inlet end of the filtering core ( 20 ).  
     
     
         6 . The cigarette filter as claimed in  claim 4 , wherein the filtering core ( 20 ) has six inlets ( 24 ) radially defined in the inlet end of the filtering core ( 20 ).  
     
     
         7 . The cigarette filter as claimed in  claim 1 , wherein the filtering core ( 20 ) has eighteen outlets ( 26 ) radially defined near the outlet end of the filtering core ( 20 ) to communicate with the residue chamber ( 15 ).  
     
     
         8 . The cigarette filter as claimed in  claim 4 , wherein the filtering core ( 20 ) has eighteen outlets ( 26 ) radially defined near the outlet end of the filtering core ( 20 ) to communicate with the residue chamber ( 15 ).