Patent ID: 9187229
Filing Date: 2015-11-17
Classification: B65D,Y10T

Abstract:
1. A one-way pressure relief valve for application to a closed package having an exterior surface and a gas-producing product therein, the valve comprising: a gas-impervious base layer having an outer edge, a top, a bottom, adhesive on the bottom for affixing the valve to the package exterior surface and a gas-flow opening extending entirely through the base layer from the bottom to the top; a gas-impervious flexible cover over the base layer and the gas-flow opening; and a pair of contacting and separable gas-impervious layers, one of the separable layers being associated with the base layer completely around the gas-flow opening and the other of the separable layers being associated with the flexible cover completely covering the gas-flow opening, the separable layers being of materials having material properties which keep the separable layers in contact to block passage of gas therebetween until a force from gas entering the gas-flow opening separates the layer associated with the flexible cover from the layer associated with the base layer sufficiently to allow the gas to flow between the separable layers, to the outer edge of the base layer, and out of the valve.