| Patent Number |
Title Of Patent |
Date Issued |
| RE36848 |
Air percussion drilling assembly |
September 5, 2000 |
| An air percussion hammer drill is disclosed for operation in an earthen formation. The air compression hammer mechanism comprises a piston that reciprocates while simultaneously rotating within its housing. A hammer drill bit slidably keyed to the bottom of the piston transfers the impac |
| RE36166 |
Air percussion drilling assembly for directional drilling applications |
March 30, 1999 |
| An air percussion hammer drill is disclosed for operation in an earthen formation. The air compression hammer mechanism comprises a piston that reciprocates while simultaneously rotating within its housing. A hammer drill bit slidably keyed to the bottom of the piston transfers the impac |
| 6918455 |
Drill bit with large inserts |
July 19, 2005 |
| A percussion drill bit is provided that has at least two different pluralities of inserts extending from the bit head to better match the conditions seen on the bit head during drilling. The preferred embodiment has a plurality of large inserts with a polycrystalline diamond layer lo |
| 5322136 |
Air percussion drilling assembly |
June 21, 1994 |
| An air percussion hammer drill is disclosed for operation in an earthen formation. The air compression hammer mechanism comprises a piston that reciprocates while simultaneously rotating within its housing. A hammer drill bit slidably keyed to the bottom of the piston transfers the impac |
| 5305837 |
Air percussion drilling assembly for directional drilling applications |
April 26, 1994 |
| An air percussion hammer drill is disclosed for operation in an earthen formation. The air compression hammer mechanism comprises a piston that reciprocates while simultaneously rotating within its housing. A hammer drill bit slidably keyed to the bottom of the piston transfers the impac |
