Patent ID: 7600587

Claim:
An apparatus for protecting a subassembly with a body having a body outer diameter inside a borehole of a well, comprising: a sleeve having a sleeve axis, an inner side and an outer side and a sleeve outer diameter larger than the body outer diameter, further wherein the sleeve has a sleeve top square cut edge and a sleeve bottom beveled edge; a plurality of offset indentations each having a offset indentation diameter formed on the outer side of the sleeve, wherein each offset indentation has an offset indentation depth between about 3/20 inches to about ¾ inches, and the plurality of offset indentations are formed in rows of 4 to 8 offset indentations along an angle sloping from about 7.5 degrees to about 45 degrees from the sleeve axis; a plurality of a metal carbide inserts providing an interference fit into each offset indentation thereby forming a wear resistant pad on the outer side of the sleeve; a sealing means disposed between the sleeve bottom beveled edge and the body; and at least two spring locking apparatus disposed in the sleeve, wherein each spring locking apparatus engages a locking indentation on the body forming a sealed protected sub assembly.