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Class Information
Number: 175/240
Name: Boring or penetrating the earth > With means movable relative to tool below ground to stop flow toward bore bottom > With undisturbed core receiver > Movable means adapted to underlie severed core
Description: Apparatus in which the movable means is adapted to admit the core of material to the core receiver, and then move to flow stopping position to block movement of the core toward bore bottom.

Patents under this class:

Patent Number Title Of Patent Date Issued
8684110 Sealed core Apr. 1, 2014
4552229 Externally powered core catcher Nov. 12, 1985
4258803 Core barrel for obtaining and retrieving subterranean formation samples Mar. 31, 1981
3952817 Basket type core retainer Apr. 27, 1976

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