(under subclass 322) Seal for well apparatus including a member having a cavity or chamber therein or forms a cavity or chamber that includes one of the parts of the joint or juncture in the well apparatus for entry of a pressurized fluid to expand at least a portion of the sealing means into position against another part of the joint or juncture.
SEE OR SEARCH THIS CLASS, SUBCLASS:
336+, for a seal intended for use in below ground well apparatus.
605, for a hollow, fluid-filled, or inflatable static contact seal or an associated member intended for use on a pipe, conduit, or cable.
646, for a static contact seal having a hollow or fluid filled inflatable chamber for other than an internal combustion engine, or a pipe, conduit, or cable.
