| Patents for E21B 3 - Rotary drilling (4,061) |
|---|
| 09/03/1980 | EP0015086A1 Kelly bushing in a downhole drilling system |
| 07/29/1980 | US4214445 Hydraulic circuitry for raise drill apparatus |
| 07/01/1980 | US4210213 Kelly bushing guard |
| 04/22/1980 | US4199033 Augering accessory for backhoe or the like |
| 04/16/1980 | EP0009639A2 Multi-purpose mobile drill rig |
| 04/08/1980 | US4196914 Chuck for an earth boring machine |
| 03/18/1980 | CA1073894A1 Rock drilling method |
| 03/11/1980 | US4192206 Apparatus for rotating a tubular member |
| 03/05/1980 | EP0008477A2 Chuck for driving a drill pipe |
| 02/26/1980 | US4190119 Earth drilling apparatus |
| 02/26/1980 | US4190116 Mine roof bolter |
| 12/25/1979 | CA1068677A Raise-boring |
| 12/18/1979 | CA1068253A1 Drilling shock sub |
| 10/30/1979 | US4172391 Drill drive mechanism |
| 08/28/1979 | CA1061324A1 Rock drilling machine |
| 07/31/1979 | CA1059614A1 Ultrasonic inspection apparatus for well operations |
| 07/31/1979 | CA1059613A1 Ultrasonic inspection apparatus for vertical members |
| 07/17/1979 | CA1058606A1 Rotary power slip assembly |
| 07/11/1979 | EP0003006A1 A rock drill boom structure |
| 03/20/1979 | US4144953 Rotary drive disc brake for drawworks |
| 02/06/1979 | US4137974 Hydraulically driven kelly crowd |
| 01/16/1979 | US4134460 Hydraulic drilling device |
| 12/19/1978 | CA1044690A1 Rotary drilling rig |
| 12/19/1978 | CA1044491A1 Drill shock absorber |
| 11/14/1978 | CA1042430A1 .delta.1-1-azacycloalkene-2-carboxylic acids and their production |
| 10/03/1978 | CA1039705A1 Derrick tilting system |
| 09/19/1978 | US4114701 Drill rod table bushing arrangement |
| 08/01/1978 | US4103745 Portable drilling machine |
| 07/25/1978 | US4102409 Rock drilling machine |
| 06/20/1978 | US4095656 Raise bore drilling |
| 03/28/1978 | US4081163 Blow out preventer handling system |
| 02/21/1978 | USRE29541 Hydraulic drilling rig and power swivel |
| 02/21/1978 | US4074778 Square hole drill |
| 02/21/1978 | US4074775 Power swivel |
| 02/14/1978 | US4073352 Raise bore drilling machine |
| 01/10/1978 | US4067423 Control system for rotary drill |
| 11/29/1977 | US4060014 Power tong |
| 11/08/1977 | US4057116 Slim hold drilling |
| 11/08/1977 | US4057114 Hand-held ice auger |
| 09/20/1977 | US4049065 Drilling apparatus |
| 08/16/1977 | US4041773 Ultrasonic inspection apparatus for well operations |
| 08/09/1977 | US4040666 Apparatus and method of shield excavation |
| 08/02/1977 | US4039176 Marine riser spider shock absorber apparatus |
| 05/03/1977 | US4020688 Ultrasonic inspection apparatus for vertical members |
| 02/15/1977 | US4007898 Torque collar for high torque motors |
| 01/25/1977 | US4004470 Drilling apparatus for drilling small diameter bore holes deep into the earth |
| 01/18/1977 | US4003907 Ring contractionchemical, hydrolysis |
| 12/28/1976 | US3999260 Rotary power slip assembly |
| 12/07/1976 | US3995701 Derrick tilting system |
| 11/30/1976 | US3994350 Rotary drilling rig |
| 10/26/1976 | US3987856 Kelly crowd for vertical drill rig |
| 10/19/1976 | US3986564 Well rig |
| 09/14/1976 | US3980145 Method and apparatus for inserting tubular structural members in a soil formation |
| 09/14/1976 | US3979944 Hydraulic drill, in particular a rock drill |
| 08/10/1976 | US3973468 Multi-stage extendible and contractible shaft with shock absorption |
| 05/25/1976 | US3958678 Roller clutch |
| 04/20/1976 | US3951216 Diamond drill supporting apparatus |
| 04/13/1976 | US3949818 Hydraulic drilling rig and power swivel |
| 03/30/1976 | US3947009 Drill shock absorber |
| 02/03/1976 | US3936733 Apparatus for supporting an inspection device for tubular members and accommodating lateral shifting of the tubular members as they are run into or pulled from a well bore |
| 01/20/1976 | US3933059 Deep drilling machine demountable for helicopter transport |