With means movable relative to tool to receive, retain, or sever undisturbed core > Core bit closure relative upwardly movable by core > Patents

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Class Information
Number: 175/245
Name: Boring or penetrating the earth > With means movable relative to tool to receive, retain, or sever undisturbed core > Core bit closure relative upwardly movable by core
Description: Apparatus in which the movable means comprises an element initially closing the core receiving opening in the tool, said means being moved away from the working face of the tool as the core is formed.

Patents under this class:

Patent Number	Title Of Patent	Date Issued
7341118	Rotating dry drilling bit	Mar. 11, 2008
7296638	Orientation device for a core sample	Nov. 20, 2007
6394196	Core drill	May. 28, 2002
4646843	Retrieval device	Mar. 3, 1987
4573539	Hydraulically pulsed indexing system for sleeve-type core barrels	Mar. 4, 1986
4258803	Core barrel for obtaining and retrieving subterranean formation samples	Mar. 31, 1981
4156469	Method of and apparatus for recovery of cores from soft and unconsolidated earth materials	May. 29, 1979
4130170	Probe for use in geological surveys	Dec. 19, 1978
3949819	Soil sampling device	Apr. 13, 1976