| Patents for E21B 45 - Measuring the drilling time or rate of penetration (257) |
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| 10/20/1992 | US5155922 Cable length measuring device |
| 09/17/1992 | WO1992015772A1 Device for measuring drilling mast swivel movement |
| 07/29/1992 | CN1017639B Automatic multiparameter recorder for geology of well drilling |
| 06/13/1992 | WO1992010641A1 Method and device for measuring the rate of penetration of equipment in a well |
| 06/13/1992 | CA2075174A1 Method and apparatus for measuring the travel speed of a well boring tool |
| 04/28/1992 | US5107705 Video system and method for determining and monitoring the depth of a bottomhole assembly within a wellbore |
| 04/15/1992 | EP0480808A2 Depth measuring device with wear resistant guide means |
| 10/02/1991 | EP0449710A2 Video system and method for determining and monitoring the depth of a bottomhole assembly within a wellbore |
| 10/01/1991 | CA2039406A1 Video system and method for determining and monitoring the depth of a bottomhole assembly within a borehole |
| 04/17/1991 | EP0422706A2 System and method for monitoring drill bit depth |
| 12/11/1990 | US4976143 System and method for monitoring drill bit depth |
| 08/28/1990 | US4951505 Block position sensor |
| 09/26/1989 | CA1261053A1 Core monitoring device |
| 07/04/1989 | US4843875 Procedure for measuring the rate of penetration of a drill bit |
| 05/23/1989 | US4831871 Process and apparatus for calculation of the instantaneous speed of a tool |
| 05/16/1989 | US4830119 Top head drive cooling system |
| 04/12/1989 | CN1032380A Automatic multiparameter recorder for geology of well drilling |
| 11/29/1988 | US4787244 Well pipe or object depth indicator |
| 11/02/1988 | EP0289068A1 Procedure for measuring the rate of penetration of a drill bit |
| 04/05/1988 | US4736297 Continuous real time drilling penetration rate recorder |
| 04/05/1988 | US4735269 Core monitoring device with pressurized inner barrel |
| 05/19/1987 | CA1222052A1 Device for the determination of a mobile component's position, and drilling apparatus making use of said device |
| 05/05/1987 | US4662209 Course length measurement |
| 01/27/1987 | US4638872 Core monitoring device |
| 01/06/1987 | US4634860 Device for determining the position of a moving part and drilling machine including such a device |
| 10/15/1986 | EP0197696A2 Core monitoring device |
| 10/07/1986 | US4616321 Drilling rig monitoring system |
| 09/02/1986 | US4610005 Video borehole depth measuring system |
| 01/21/1986 | US4565007 Process and apparatus for measuring the coiled/uncoiled length of winding gear cable |
| 04/23/1985 | US4512186 Drill rate and gas monitoring system |
| 01/15/1985 | US4493218 Transducer system employing a spring with linear characteristics |
| 11/13/1984 | US4481714 For measuring the length of a string of tubular members |
| 07/17/1984 | US4461015 Digital depth indicator for earth drilling apparatus |
| 07/17/1984 | US4459752 Precision tubular length measuring system |
| 07/04/1984 | EP0112810A2 A rock drilling apparatus and a method of optimizing percussion rock drilling |
| 09/27/1983 | US4407017 Method and apparatus for controlling drilling process |
| 07/26/1983 | CA1150716A2 Systems, apparatus and methods for measuring while drilling |
| 06/28/1983 | US4389885 Signal generator for a penetration rate measuring apparatus |
| 06/14/1983 | US4387774 Time recorder for in-hole motors |
| 06/07/1983 | US4387295 Pneumatic penetration sensor for oil drilling |
| 01/04/1983 | US4367477 Rate of penetration recorder |
| 05/25/1982 | CA1124228A1 Systems, apparatus and methods for measuring while drilling |
| 09/08/1981 | CA1108435A1 Method and apparatus for logging inclined earth boreholes using the measured acceleration of the well logging instrument |
| 08/25/1981 | US4285236 Rotary torque and rpm indicator for oil well drilling rigs |
| 08/04/1981 | US4282523 Method and apparatus for logging inclined earth boreholes |
| 05/29/1979 | US4156467 Well drilling system |
| 04/17/1979 | CA1052909A1 Device to gauge the position and the speed of a drill |
| 02/13/1979 | US4138886 Method and apparatus to measure the rate of advance of a drilling tool on a floating drilling installation |
| 11/07/1978 | CA1042103A1 Method and apparatus for measuring the rate of penetration in well drilling from floating platforms |
| 09/19/1978 | US4114435 Well drilling system |
| 07/11/1978 | US4099410 Rate of penetration recorder |
| 04/25/1978 | US4085509 Apparatus for compensating for the heaving of a floating drilling platform for connection with apparatus for measuring the rate of penetration of pipe run into an offshore well |
| 08/03/1976 | US3972124 Device for measuring the length of a member |
| 07/06/1976 | US3967680 Method and apparatus for actuating a downhole device carried by a pipe string |
| 03/09/1976 | US3942742 Cable guide means for a cable drum |
| 03/09/1976 | US3942594 Drill pipe monitoring system |
| 01/13/1976 | US3931735 Methods and apparatus for measuring the rate of penetration in well drilling from floating platforms |