| Patent Number |
Title Of Patent |
Date Issued |
| 6719303 |
Drill string chuck |
April 13, 2004 |
| A drill rod chuck in which the closing of the jaws is effected through the use of gas springs mounted in the slidable jaw actuating jaw bowl. Further the jaws are supported by bushings against cantilever loading during drilling and the jaws are positively advanced and retracted through |
| 6564885 |
Up-hole overshot and safety drilling apparatus |
May 20, 2003 |
| The drilling apparatus includes a safety sub mountable to the drill string outer end to retain the combination of an overshot assembly and an overshot adaptor extending within the drill string outer end during a drilling operation and preventing the drilling tool moving out of the dr |
| 6425449 |
Up-hole pump-in core barrel apparatus |
July 30, 2002 |
| The drilling apparatus includes a wire line core barrel head assembly that has a latch body seatable on a drill string landing shoulder and retained in a latch seated position by a latch assembly spring urged to a latch seated position, fluid seals on the latch body to facilitate fluidly |
| 6371205 |
Bore hole grouting apparatus and method |
April 16, 2002 |
| The grouting apparatus includes a tubular body, an outer end closure removably mounted to the outer end of the tubular body and a nozzle mounted to the inner end of the tubular body to form a container for grouting material. The tubular body has a landing shoulder seatable on a drill |
| 6109373 |
Cable overshot apparatus |
August 29, 2000 |
| The overshot apparatus includes a head subassembly coupleable to the overshot coupling device of an inner tube assembly, a jar subassembly having an outer swivel end portion for having a wire line attached thereto and a tubular member and a cable subassembly having an axially elongated |
| 6089335 |
Positive latch core barrel apparatus |
July 18, 2000 |
| The drilling apparatus includes a wire line core barrel inner tube assembly movable to a drill string bit end to have its landing ring seat on the drill string landing shoulder and its latches latchingly retain the assembly adjacent the bit end. The assembly includes a fluid bypass c |
| 6029758 |
Retractable core barrel valving apparatus |
February 29, 2000 |
| The drilling apparatus includes a wire line core barrel having a head assembly and a drilling tool connected to the head assembly. The head assembly includes a latch body with a landing shoulder seatable on the drill string landing ring, latches seatable in a drill string latch seat |
| 5934393 |
Core barrel apparatus |
August 10, 1999 |
| The core barrel apparatus includes a wire line core barrel inner tube having a latch body main body portion and an inner portion threaded together to cooperatively provide a radial outer groove mounting a landing ring seatable on the drill string landing ring with the latches seatable |
| 5788401 |
Rod joint |
August 4, 1998 |
| Joints for coupling the box and pin ends of drill rods and casings, particularly for the mineral exploration industry, have single start, helical tapered threads extending axially intermediate cylinder sections. The threads have frustoconical crests and roots with the taper being about |
