Patent ID: 8047360

Claim:
A single-lobe filter bag for infusion products comprising: a length ( 2 ) of filter material forming a chamber ( 3 ) containing a charge of the infusion product; the length ( 2 ) comprising at least a first closed top end ( 5 ) formed by a first join (S 1 ) between two first end edges of the length ( 2 ) and a second bottom end ( 7 ) closed by a second join (S 2 ) adjacent a bottom surface ( 11 ) of the filter bag ( 1 ), the second end ( 7 ) being formed by two second end edges ( 7 a , 7 b ) placed over each other to form a central extension of the second end ( 7 ); the second end edges ( 7 a , 7 b ) being positioned face to face with each other and joined in such a way as to form a tab ( 12 ) that protrudes from the bottom surface ( 11 ); a first side ( 8 ) and a second side ( 9 ), each side connecting the first end edge ( 5 ) and the second end edge ( 7 ) of the length ( 2 ), each side being at least partly folded to form a fold towards the inside of the chamber ( 3 ), each side having a top, a middle, and a bottom, the width of the first side near the bottom being, prior to infusion, greater than the width of the first side at its middle, the width of the second side near the bottom being, prior to infusion, greater than the width of the second side at its middle; a string ( 13 ) joined, at one end, by a knot (A 1 ) to the length ( 2 ) and, at the other end, by a knot (A 2 ) to a tag ( 14 ), the string ( 13 ) being looped around the length ( 2 ).