Closure or stopper forms a surface tension seal

Abstract

A closure or stopper for a container to contain liquid, powder or paste, the container having means to define a first extremely flat annular surface, the closure comprising a sealing member defining a second extremely flat surface, an annular groove that locates an O-ring, and means such as thread to urge the extremely flat surfaces into parallel abutting contact, the extremely flat surfaces adapted to form a surface tension seal when they are urged into parallel abutting contact and means to prevent lateral or shear relative movement. Another form of the closure is the sealing member being a disc that seats on the flat annular sealing surface defined by the top of the neck of a bottle to form a seal, and a metal cap to place the seal under axial load and protects the seal from vibration.

Dependencies are inferred from the claim text.