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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

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