(under subclass 179) Devices in which the expansible portion is made of a deformable nonmetallic or soft metallic material and is adapted to engage an inwardly projecting shoulder on the surrounding conduit.
(1) Note. The shoulder may be the bottom of the conduit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
115, for a central chamber with a packer or plug claimed in combination with a modified surrounding conduit.
192+, for plugs having a deformable portion engaging a surrounding conduit shoulder.
201, for packers having a rigid ring portion which engages a conduit shoulder and rides up on a pipe to expand a deformable sealing portion.
