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Class Information
Number: 175/27
Name: Boring or penetrating the earth > Automatic control > Of advance or applied tool weight
Description: Subject matter in which a sensed condition of operation controls a power operated means to initiate, modify, or terminate the advance or axial pressure of a tool upon the formation.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4660656 |
Method and apparatus for controlling the rotational torque of a drill bit |
Apr. 28, 1987 |
| 4535972 |
System to control the vertical movement of a drillstring |
Aug. 20, 1985 |
| 4503918 |
Rock drilling apparatus |
Mar. 12, 1985 |
| 4501219 |
Tensioner apparatus with emergency limit means |
Feb. 26, 1985 |
| 4491186 |
Automatic drilling process and apparatus |
Jan. 1, 1985 |
| 4478290 |
Anti-buckling device for mine-roof bolting machines |
Oct. 23, 1984 |
| 4466488 |
Position indicator for drill string compensator |
Aug. 21, 1984 |
| 4434971 |
Drilling rig drawworks hook load overspeed preventing system |
Mar. 6, 1984 |
| 4403890 |
Method of laying pipe underground and system therefor |
Sep. 13, 1983 |
| 4403655 |
Draw works disabling device for use with a well drilling apparatus |
Sep. 13, 1983 |
| 4371040 |
Anti-buckling device for mine-roof bolting machines |
Feb. 1, 1983 |
| 4354233 |
Rotary drill automatic control system |
Oct. 12, 1982 |
| 4351261 |
Riser recoil preventer system |
Sep. 28, 1982 |
| 4268013 |
Crane motion compensator |
May. 19, 1981 |
| 4195699 |
Drilling optimization searching and control method |
Apr. 1, 1980 |
| 4176722 |
Marine riser system with dual purpose lift and heave compensator mechanism |
Dec. 4, 1979 |
| 4165789 |
Drilling optimization searching and control apparatus |
Aug. 28, 1979 |
| 4153119 |
Directional drilling apparatus |
May. 8, 1979 |
| 4144953 |
Rotary drive disc brake for drawworks |
Mar. 20, 1979 |
| 4121806 |
Apparatus for compensating variations of distance |
Oct. 24, 1978 |
| 4118954 |
Motion compensator |
Oct. 10, 1978 |
| 4079795 |
Method and a device for drilling with several tools in simultaneous operation |
Mar. 21, 1978 |
| 4059148 |
Pressure-compensated dual marine riser |
Nov. 22, 1977 |
| 4049239 |
Drill spring tension limiting device for floating drilling vessels |
Sep. 20, 1977 |
| 3998280 |
Wave motion compensating and drill string drive apparatus |
Dec. 21, 1976 |
| 3991837 |
Buoyant counterbalancing for drill string |
Nov. 16, 1976 |
| 3971449 |
Procedure for controlling a rock drill and rock drill for carrying out the procedure |
Jul. 27, 1976 |
| 3943868 |
Heave compensation apparatus for a marine mining vessel |
Mar. 16, 1976 |
| 3942594 |
Drill pipe monitoring system |
Mar. 9, 1976 |
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