The first tea bag patents date from c19034 and were designed for the convenient transport of tea resembling small sacks rather than the convenience of brewing a cup rectangular shapedshytea bags were introduced in 1944 since then pyramid shaped tea bags were invented by brooke bond in 1997 whole leaf sri lankan earl grey tea the large biodegradable pyramid tea bags give the leaves maximum room to infuse the leaves are not torn or broken during production which creates a fuller more comp