Patent ID: 7648041

Claim:
A container ( 1 ) comprising: an open-ended ( 2 a ) container body ( 2 ) formed with a substantially level inner ledge ( 2 c ) subjacently bordering the mouth ( 2 a ) of the container body, the inner ledge ( 2 c ) being recessed with a continuous, cross-sectionally arcuate channel ( 2 d ); a container lid ( 3 ) rimmed with a substantially level platelike section ( 3 f , 3 g ) inwardly along which a continuous gasket-anchoring groove ( 3 e ) is formed; a cartridge section ( 2 e ), formed in the container body, for precision packaging a plurality of substrate plates; a gasket ( 6 ) formed with an anchoring portion ( 6 a ) fitted into the gasket-anchoring groove ( 3 e ) in the container lid ( 3 ), and a ledge portion ( 6 b ) extending along the platelike section ( 3 f ) of the container lid ( 3 ) and bending ( 6 c , 6 d ) into a tip formed so as to seat in the arcuate channel ( 2 d ) in the inner ledge ( 2 c ) of the container body ( 2 ) when the container lid ( 3 ) is closed onto the container body ( 2 ), yet so as to maintain a predetermined gap (C) between the gasket ( 6 ) and the inner ledge ( 2 c ); wherein the gap, the resiliency of the gasket and its bent form, and the shape of the channel are predetermined so that in response to a difference in pressure between the interior and exterior of the container body when the container lid is closed over the container body, the tip slides out of the channel, whereby the seal is momentarily broken, the pressure difference equalizes, and the tip again seats into the channel.