Patent ID: 8919601

Claim:
A pressure-motion compensating diaphragm for air and liquid tight sealing, in combination with a cap, of a container having a neck and a top and a vertical centerline and housing a product having a top level below the diaphragm, wherein when the diaphragm is in an unstressed position, a cross-section of the diaphragm comprises: an edge adapted to engage at least one of the cap and the container, positioning the diaphragm horizontally in the container proximate the neck of the container and under the cap; a center deflector button; and a plurality of segments having substantially no straight portions extending from the edge to the center deflector button, each segment defined as a surface following a circle, and including a first segment having a concave surface with respect to the centerline and a second segment adjacent to the first segment and having a convex surface with respect to the centerline, the segments together defining an asymmetrical plurality of segments with a discrete transition peak between them, wherein in response to forces applied to the diaphragm and created by pressure changes inside the container that occur as the container is filled with the product by a filling process including one or more of filling, pasteurization, or cooling steps, the plurality of segments and the center deflector button translate the forces into motion to deflect the diagram into a stressed position.