| 摘要 |
PCT No. PCT/JP94/02127 Sec. 371 Date Jan. 31, 1996 Sec. 102(e) Date Jan. 31, 1996 PCT Filed Dec. 14, 1994 PCT Pub. No. WO96/18332 PCT Pub. Date Jun. 20, 1996Primarily a pair of substantially fan-shaped filter sheets are laid one upon another and bonded to each other at least in the proximity of their side edges to obtain a basic filter 4 adapted to form a bag having a circular opening as arc-shaped outer edges 24A, 24B of these filter sheets, wherein a pair of substantially crescent-shaped flap sheets 6 are bonded along their arc-shaped edges to said basic filter 4 along their arc-shaped outer edges 24A, 24B to obtain a filter 1 provided with a pair of pockets 8 openable downwardly of the filter 1. |
