US PATENT SUBCLASS 175 / 325.3-- .~.~.~ With bore wall engaging means rotatable relative to shaft section (e.g., with bearings)

US PATENT SUBCLASS 175 / 325.3
.~.~.~ With bore wall engaging means rotatable relative to shaft section (e.g., with bearings)

Current as of: June, 1999
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175 /	HD	BORING OR PENETRATING THE EARTH

320	DF	WITH TOOL SHAFT DETAIL {4}
325.1	DF	.~ Shaft carried guide or protector {3}
325.2	DF	.~.~ Coupled between shaft sections or bit and shaft section {2}
325.3		.~.~.~ With bore wall engaging means rotatable relative to shaft section (e.g., with bearings)

DEFINITION

Classification: 175/325.3

With bore wall engaging means rotatable relative to shaft section (e.g., with bearings):

(under subclass 325.2) Apparatus where a borehole contacting device is mounted on the shaft section in a manner that allows the shaft section to rotate while the guide or protector means is substantially fixed in the borehole.

SEE OR SEARCH CLASS

384, Bearings,

29+, for a cylindrical linear bearing of general use; if borehole or well contacting structure is disclosed or claimed, placement is in Class 175, subclasses 325.1+.