A method and apparatus for leak testing a sealed package having at least one flexible wall portion and a sealed flange wherein at least one flexible wall portion of the package spaced from at least a seal-exposing edge of the sealed flange is gripped and pulled outwardly from the package to stress the...http://www.google.fr/patents/US5111684?utm_source=gb-gplus-shareBrevet US5111684 - Method and apparatus for leak testing packages
