.~ With controllable passage between central chamber and space below packer {7}
152
.~.~ Passage controllable by movement of central chamber
DEFINITION
Classification: 166/152
(under subclass 142) Devices in which the valve, closure or changeable restriction controlling the passage is opened, closed, held in position or freed for movement because the central conduit or receptacle is moved.
SEE OR SEARCH THIS CLASS, SUBCLASS:
128, for devices as defined in subclass 152 in which there is also an expanding anchor means.
143+, (especially 144), for devices as defined in subclass 152 in which the central chamber (usually a setting tool) is detachable after operating a valve to close the passage.
145, for devices as defined in subclass 152 in which there is also a bypass around the packer which is closed when the passage to the central chamber is opened.
146, for devices as defined in subclass 152 in which there is also a continuously open passageway between the central chamber and a space between plural packers. 148, for devices as defined in subclass 152 in which there is also an upwardly biased check valve between the central chamber and the space below the packer.
150, for devices having a controllable passage between a central chamber and a space below a packer and also having a space below a packer and also having a passageway between a central chamber and the space above the packer in which the passageway is controlled by a valve, closure or changeable restriction operated by movement of the central chamber.
