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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
8613330 Coring tools and related methods Dec. 24, 2013
8453766 Hydrocarbon formation core protection and transportation apparatus Jun. 4, 2013
8387721 Orientation head Mar. 5, 2013
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

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