.~ Head for tool, piston or cleaner (e.g., cement head)
DEFINITION
Classification: 166/70
(under subclass 67) Devices comprising (1) above ground apparatus claimed in combination with a piston as defined in
subclass 153 or a mechanical cleaner as defined in subclass 170, or (2) above ground apparatus with means for engaging a device to be inserted into the well to restrain the device against upward or downward movement.
(1) Note. Under (2) of the definition the means for engaging the device must be something other than a supporting cable, rod or pipe attached to the device.
(2) Note. The "device" under (2) of the definition must be something other than a mere tubing, casing, cable or rod extending into the well from above ground level.
SEE OR SEARCH THIS CLASS, SUBCLASS:
82+, for a sealing means on a casing head for a cable rod or pipe in combination with means to be engaged by a well device for causing the sealing means to be released or yield so that the well device may pass out of the well.
