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| US4256193 | 29 May 1979 | 17 Mar 1981 | Sandvik Ab, Fack & Aktiebolaget SKF | Rotary drill bit with rotary cutter | | US5636700 | 3 Ene 1995 | 10 Jun 1997 | Dresser Industries, Inc. | Roller cone rock bit having improved cutter gauge face surface compacts and a method of construction | | US5709278 | 22 Ene 1996 | 20 Ene 1998 | Dresser Industries, Inc. | Rotary cone drill bit with contoured inserts and compacts | | US5722497 | 21 Mar 1996 | 3 Mar 1998 | Dresser Industries, Inc. | Roller cone gage surface cutting elements with multiple ultra hard cutting surfaces |
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