[1] In the 1980s, a number of inflatable cushion systems were documented.
[2][3][4][5][6] Before 2000, most inflatable air cushions used a single check valve.
[7] However if one part of the cushion was punctured then this packaging would completely deflate.
In 2002, several types of continuously independent one way air valve films were introduced.
[8] These patents incorporated a one way air valve film, which can be produced continuously and independently.