E21B 15 - Supports for the drilling machine, e.g. derricks or masts

Patents for E21B 15 - Supports for the drilling machine, e.g. derricks or masts (4,619)
11/1976
11/16/1976	US3991978 Submersible pump boom
10/1976
10/26/1976	US3987639 Methods and apparatus for installing a drill conductor from an offshore tower
10/19/1976	US3986564 Well rig
09/1976
09/28/1976	US3982715 Adjustable tool positioning structure
09/21/1976	US3981485 Helicopter transportable drilling rig
09/14/1976	US3980142 Drilling boom
09/07/1976	US3978993 Vertically adjustable pipe racking apparatus
08/1976
08/24/1976	US3976207 Casing stabbing apparatus
08/24/1976	US3975831 Directing instrument
08/10/1976	US3973747 Method of and arrangement for controlling the speed of the movements of hydraulic booms
06/1976
06/29/1976	US3965628 Drill mast support assembly
06/15/1976	USRE28860 Curved offshore well conductors
06/08/1976	US3961673 Drilling apparatus
06/01/1976	US3960360 Internally pressurized load supporting mast
05/1976
05/18/1976	US3957124 Tunnel-drilling truck
03/1976
03/09/1976	US3942593 Drill rig apparatus
02/1976
02/24/1976	US3940111 Apparatus for applying a determined force to an element connected to an installation subjected to alternating movements
02/10/1976	US3937334 Pipe handling device
01/1976
01/27/1976	US3934658 Modular underwater well platform system