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| Number | Title | Issue Date |
| 3952816 | Drilling system and method of pulling it up A drilling system includes a drill pipe and a cutting means located therein. A locking mechanism with said drill pipe is provided on said cutting means and is operatively connected with a spearhead engageable with an engaging mechanism of a pulling-up dev... | 04/27/1976 |
| 3951219 | Drill tool comprising a core barrel and a removable central portion Apparatus for interchanging the central portion of a drill tool with a core barrel is disclosed. The interchange is effectuated without the need for raising the drilling tool with the drive turbine. Both the core barrel and the central portion of drilling... | 04/20/1976 |
| 3938596 | Turbo-drill A turbo-drill is provided with a mechanism for reducing the speed of rotation of the drilling bit, the mechanism being made in the form of a frictional reduction means wherein the rotors of the turbo-drill are the inner wheel and the stators of the turbo-... | 02/17/1976 |
| 3936247 | Floating flow restrictors for fluid motors This invention relates to flow restrictors in fluid motors where the operating fluid also passes through the bearings of the motor.... | 02/03/1976 |
| 3930545 | Tiltable coupling A tiltable coupling has one end thereof connected to a down-hole drill and has the other end thereof connected to a section of drill rod. By using that tiltable coupling, it is possible to cause a down-hole drill to drill curved holes in subterranean form... | 01/06/1976 |
