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| Number | Title | Issue Date |
| 3991837 | Buoyant counterbalancing for drill string A fluid actuated counterbalancing apparatus and method for maintaining substantially constant height of the upper end of a string of members suspended from a vessel floating on a body of water wherein such position is controlled by a buoyant element float... | 11/16/1976 |
| 3981369 | Riser pipe stacking system An offshore drilling rig that embodies a means for vertical stacking of riser pipe sections and blowout preventors below a derrick floor and includes riser pipe manipulating mechanisms for transporting units in a vertical condition between a storage area ... | 09/21/1976 |
| 3977479 | Geological exploration method and apparatus A method of obtaining geological specimens is disclosed along with methods of producing a geological or geochemical map and apparatus for accomplishing the method. A fixed wing or other airborne vehicle, such as a light plane or a helicopter, is operated ... | 08/31/1976 |
| 3949496 | Wave compensating system for suction dredgers A suction dredger, comprising a vessel and a suspension conveying conduit provided with a pump and having a nozzle suspended by means of at least one cable of a lifting device on the vessel is improved for preventing breaking of the cable or damage of oth... | 04/13/1976 |
| 3943868 | Heave compensation apparatus for a marine mining vessel A ship in which a string of heavy pipe is raised or lowered vertically beneath the ship at a substantially constant velocity in spite of heaving movement of the ship. The equipment for raising and lowering the pipe string is supported by the vessel throug... | 03/16/1976 |
| 3940111 | Apparatus for applying a determined force to an element connected to an installation subjected to alternating movements This apparatus comprises a main jack for supporting elements from the installation and a regulating device which includes at least one pivoting jack and makes use of a source of pressurized fluid in communication with a chamber of variable volume in which... | 02/24/1976 |
| 3931735 | Methods and apparatus for measuring the rate of penetration in well drilling from floating platforms New and improved methods and apparatus exemplifying the present invention are disclosed herein for measuring the changes in total elongation of a drill string due to variations in the tensional forces acting thereon during a typical well drilling operatio... | 01/13/1976 |
