Below-ground (1) hammer, or (2) impact members > With releasable means to detachably retain telescoping members against axial reciprocation > Frangible > Patents

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Class Information
Number: 175/301
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > With releasable means to detachably retain telescoping members against axial reciprocation > Frangible
Description: Apparatus in which said holding means comprises an element which is destructible so that said element is used only one time.

Patents under this class:

Patent Number	Title Of Patent	Date Issued
5857710	Multi-cycle releasable connection	Jan. 12, 1999
5495902	Coil tubing hydraulic jar device	Mar. 5, 1996
4576229	Device for facilitating release of stuck drill collars	Mar. 18, 1986
4466621	Rotary drill bit multiple seal assembly	Aug. 21, 1984
4081043	Hydraulic jars for bore hole drilling	Mar. 28, 1978
4007790	Back-off apparatus and method for retrieving pipe from wells	Feb. 15, 1977