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| Number | Title | Issue Date |
| 7044776 | Wire connector An open-face electrical wire connector for forming an electrical connection to a wire connector lug wherein the wire connector lug, which is free of any sealant, is located in a portion of a housing that can be brought into engagement with another portion of a housi... | 05/16/2006 |
| 7040417 | Drilling systems The present invention discloses, in certain aspects, systems and methods for producing cyclical impacts and, in certain aspects for moving a drilling apparatus for drilling a borehole in a formation, the system in certain embodiments including a housing with a longi... | 05/09/2006 |
| 6530440 | Percussive drilling apparatus A percussive drill for extension drilling includes a drill bit, a tube having a male screw thread attached to a female screw thread of the drill bit, and a rod having a male screw thread attached to a female screw thread of the tube. Central passages of t... | 03/11/2003 |
| 5605197 | Valve assembly for a fluid-activated, percussive paving breaker A unitary valve assembly for a fluid-activated, percussive paving breaker includes a valve chest having an outer sidewall forming an internal valve chamber, a sidewall within the internal chamber forming a valve bore, a reciprocal valve within the valve b... | 02/25/1997 |
| 5586606 | System for lubricating and reciprocating a piston in a fluid-activated, percussive paving breaker A system for lubricating and reciprocating a piston in a fluid-activated, percussive paving breaker includes a unitary valve assembly positioned within a bore of a rear portion of a tool housing, the valve assembly having an oil reservoir for lubricating ... | 12/24/1996 |
| 5582257 | System for lubricating and reciprocating a piston in a fluid-activated, percussive paving breaker A system for lubricating and reciprocating a piston in a fluid-activated, percussive paving breaker includes a unitary valve assembly positioned within a bore of a rear portion of a tool housing, the valve assembly having an oil reservoir for lubricating ... | 12/10/1996 |
| 5524714 | System for lubricating and reciprocating a piston in a fluid-activated, percussive paving breaker A system for lubricating and reciprocating a piston in a fluid-activated, percussive paving breaker includes a unitary valve assembly positioned within a bore of a rear portion of a tool housing, the valve assembly having an oil reservoir for lubricating ... | 06/11/1996 |
| 5307881 | Flushing system for a percussive, fluid-activated apparatus A debris flushing system for a percussive, fluid-activated apparatus includes a first and second separate and independent flushing system in the apparatus, each flushing system having a separate combination of passageways in the apparatus for fluid commun... | 05/03/1994 |
| 4854393 | Combination air hammer, water stream blaster and liquid mist dust suppressor An air hammer powered debris chisel headed tool having a water stream blaster outlet directing a high speed water stream forwardly closely adjacent and above the chisel head when valve controlled for use. Air misting outlets are also provided at the forwa... | 08/08/1989 |
| 4726429 | Percussion down hole drilling tool with central fluid flushing passage A percussion drilling tool assembly is provided which operates under fluid pressure to reciprocating a hammer, the hammer is disposed in a barrel assembly and operates to strike an anvil bit shank to cause the bit to thereby penetrate a rock substrate mat... | 02/23/1988 |
| 4694911 | Drilling assembly for percussion drilling of deep wells A percussion drilling tool assembly is provided which operates under fluid pressure to reciproce a hammer, the hammer is disposed in a barrel assembly and operates to strike an anvil bit shank to cause the bit to thereby penetrate a rock substrate materia... | 09/22/1987 |
