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An aircraft having vertical takeoff and landing capability provided with at least first and second laterally extending paddle wheels rotatable on a central axis perpendicular to the longitudinal axis of the aircraft fuselage and between its nose and tail.
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| Number | Title | Issue Date |
| 5433279 | Portable top drive assembly The assembly is designed to convert a conventional land rig to "top drive". It comprises a torque track that is shipped in sections and is assembled to form a rigid track extending vertically in the derrick. The track is rigidly attached to the derrick on... | 07/18/1995 |
| 5390747 | Well rig lift system and a hydraulic energy-storing well rig lift system A well rig lifting system and a hydraulic energy-storing well rig lifting system, wherein a high pressure energy-storing cylinder and a composite cylinder or cylinder group are used to carry out the lifting and lowering operations. During the lifting oper... | 02/21/1995 |
| 5348104 | Rotary drive assemblies A well assembly including a drive string, a frame, a spindle mounted on the frame and means for rotating the spindle, is constructed to allow the upper end of the string to pass through the spindle. A nut with a non-circular downward protuberance is tight... | 09/20/1994 |
| 4924950 | Method of drilling a well by utilizing AE/MA measurement A method of drilling a well by utilizing AE/MA measurement which has the steps of monitoring an AE wave emitted at the periphery of the well, and drilling the well without lost circulation by providing lost circulation preventing means in the well if the ... | 05/15/1990 |
| 4730254 | Drill string make-up and breakout torque control system and apparatus A system and apparatus for the monitoring and control of torque applied during make-up and breakout of drill string components. The force applied by the cat head to the tong is measured by a hydraulic load cell and the horizontal and vertical angles betwe... | 03/08/1988 |
| 4607694 | Well plug quality testing A method is described for testing the quality of cement slurry installed in a borehole to form a plug. The density of the cement, when relatively pure, is compared with the density after the slurry has been placed in situ and has been exposed to potential... | 08/26/1986 |
| 4375241 | Drilling installation, more specifically for oil-drilling operations This invention concerns a drilling installation comprising a base which rests on the ground, a rig, a winch, items of equipment such as a drill-pipe storage coffer, and a working floor which is raised above the base, surrounding the rig. The installation ... | 03/01/1983 |
| 4341270 | Drill string suspension tower Improved means for suspending a drill string using a pair of hydraulically actuated belts is disclosed. A derrick or tower is mounted to a base to overlie a standard rotary drill table. The drill string (comprising a number of drill pipes and a drill coll... | 07/27/1982 |
| 4305237 | Compact sectionalized drilling mast, power arrangement and support means therefor A sectionalized drilling mast, power arrangement and support means therefor includes base means to support the drilling mast means when reclined and when erect. Drawworks trailer ramp means are secured substantially at right angles to said base means; pow... | 12/15/1981 |
| 4137974 | Hydraulically driven kelly crowd A vertical drill rig is provided with a hydraulic crowd mechanism for crowding down a drive kelly having a rotating drilling tool supported from the lower end thereof. The crowd mechanism includes a drum having first and second cables wound in opposite se... | 02/06/1979 |
| 4135340 | Modular drill rig erection systems A system for erecting elevated floors where a first support floor with a drawworks thereon is connected to one end of a base structure by two pair of parallel spaced pivotable links and a second support floor is coupled to the opposite end of the base str... | 01/23/1979 |
| 4064950 | Hydraulic drilling machine A hydraulic drilling machine for cutting into rock formations and the like. The machine has a rotating drill rod with a bit at one end and a rotary hydraulic drive motor at the other end. The drill rod is supported on a carriage adapted for linear travel ... | 12/27/1977 |
| 4024924 | Drilling rig with independent table structure An improved portable drilling rig for drilling deep boreholes in the earth, in which the table or working floor of the rig, on which the rotary table and draw works are supported, is on a separate framework supported on and attached to a structural frame ... | 05/24/1977 |
| 4009544 | Drilling rig with improved mast support structure An improved portable drilling rig for drilling deep boreholes in the earth, in which the mast is rotatable to a horizontal position at a small distance above the ground. The mast is of rectangular construction, with four corner columns, and four support l... | 03/01/1977 |
| 3986564 | Well rig An improved, multipurpose oil well rig employing hydraulically actuable components. Two, three, or four or more piston cylinder fluid motors are provided in the rig lift system, powered either by a power unit having high pressure, low volume pumping chara... | 10/19/1976 |
| 3942593 | Drill rig apparatus There is disclosed herein a mobile well drilling rig apparatus adapted for rapid assembly and disassembly thereof. The drilling rigs of the invention comprise a trailerable telescoping mast assembly and a separate sectionable substructure assembly therefo... | 03/09/1976 |
