With means movable relative to tool to receive, retain, or sever undisturbed core > Receiver removable through below-ground tool shaft > With fluid pressure-responsive means to remove receiver or operate latch > Patents

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Class Information
Number: 175/247
Name: Boring or penetrating the earth > With means movable relative to tool to receive, retain, or sever undisturbed core > Receiver removable through below-ground tool shaft > With fluid pressure-responsive means to remove receiver or operate latch
Description: Apparatus in which (1) a fluid pressure operated means or surface is provided to move a core receiver toward above ground or (2) a means latching the core barrel in the tool shaft is actuated to engaged or released position by fluid pressure.

Patents under this class:

Patent Number	Title Of Patent	Date Issued
6708784	Core barrel valve assembly	Mar. 23, 2004
6019181	Core drilling latch assembly	Feb. 1, 2000
5992543	Core drilling latch assembly	Nov. 30, 1999
5592994	Propulsion seal for wire line core drilling apparatus	Jan. 14, 1997
4832138	Device to control the locking of a boring corer	May. 23, 1989
4588036	Continuous, undisturbed sampling by rotational boring in non-plastic granular tills	May. 13, 1986
4573539	Hydraulically pulsed indexing system for sleeve-type core barrels	Mar. 4, 1986
4452321	Device in core barrels	Jun. 5, 1984