(under subclass 322) Seal for well apparatus wherein the seal has an open containerlike shape or form (e.g., C, U, V, etc.) radially extending to a longitudinal axis of one of the parts.
SEE OR SEARCH THIS CLASS, SUBCLASS:
439, for a piston ring including a peripheral, radially sealing, flexible projection having a C, U, or V cross-sectional profile forming an axially facing cup (e.g., piston cup, etc.).
626, for a static contact seal having a particular seal shape intended for use on a pipe, conduit, or cable.
