.~ Sealing portion closes port between central pipe and outside space when unexpanded
DEFINITION
Classification: 166/141
(under subclass 179) Devices under the class definition comprising an expansible packer or plug in which the blocking or sealing portion of the packer closes a port in the side wall of the central tubular member when in unexpanded condition and opens the port to the space outside the packer or plug when expanded laterally to blocking position.
(1) Note. A ring portion which is attached to the sealing part and handled as a unit therewith is considered part of the sealing portion.
