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| Number | Title | Issue Date |
| 7191829 | Gripper assembly for downhole tools A gripper assembly for anchoring a tool within a downhole passage and for possibly assisting movement of the tool within the passage. The gripper assembly includes an elongated mandrel and flexible toes that can be radially displaced to grip onto the surface of the ... | 03/20/2007 |
| 7174974 | Electrically sequenced tractor A downhole drilling tractor for moving within a borehole comprises a tractor body, two packerfeet, two aft propulsion cylinders, and two forward propulsion cylinders. The body comprises aft and forward shafts and a central control assembly. The packerfeet and propul... | 02/13/2007 |
| 7156181 | Puller-thruster downhole tool A method and apparatus for propelling a tool having a body within a passage. The tool includes a gripper including at least a gripper portion which can assume a first position that engages an inner surface of the passage and limits relative movement of the gripper p... | 01/02/2007 |
| 5442951 | Device for testing pipes for interior leaks An arrangement for examining pipes for interior leaks, comprises two mirror-inverted sections, each having at least one clamping device and at least one pair of runners. A pneumatic pressure source is provided for inspection of the pipes, as well as a sea... | 08/22/1995 |
| 4538522 | Cable gripping apparatus having forward and rearward movement capabilities An improved cable following apparatus especially suitable for use in replacing an existing underground cable is disclosed herein. This apparatus utilizes a telescopically configured main body disposed around a cable in question and front and rear cable gr... | 09/03/1985 |
| 4537136 | Pipeline vehicle The vehicle has front and rear sets of wheels (24) carried on sprung arms (20). Each wheel can be locked by a clutch (26). One set of wheels is locked while a ram (32) is operated, causing the other set of wheels to roll forward. The main body (10) of the... | 08/27/1985 |
| 4534425 | Cable reaming apparatus and method The technique for replacing an existing underground cable and a specific apparatus for doing so are disclosed herein. The apparatus includes a main body or cable follower which is interconnected with the cable to be replaced for slidable movement along th... | 08/13/1985 |
| 4522129 | Device for charging drillholes A two-piece, telescopic climber, which is insertable into a drillhole behind cylindrically shaped explosive charges, alternately advances one and then the other of its two telescopic pieces in the direction of the drill hole thereby to urge the charges fo... | 06/11/1985 |
| 4519462 | Cable following apparatus having cable cleaning capabilities and method A cable following apparatus especially suitable for replacing existing underground cable is disclosed herein. This apparatus includes a tubular main body disposed around and movable along a particular cable in a forward direction while an arrangement of w... | 05/28/1985 |
| 4493379 | Cable reaming apparatus and method The technique for replacing an existing underground cable and a specific apparatus for doing so are disclosed herein. The apparatus includes a main body or cable follower which is interconnected with the cable to be replaced for slidable movement along th... | 01/15/1985 |
| 4432271 | Locomotion unit for a tool support adapted for progression through passageways A locomotion unit is remotely controlled to advance stepwise through a passageway by frictional engagement with the surfaces of the passageway walls. A support section is mounted on the locomotion device to bring special tools to bear at predetermined pos... | 02/21/1984 |
| 4403667 | Cable following apparatus utilizing a releasable cable gripping mechanism A cable following apparatus especially suitable for use in replacing existing underground cable by reaming around and along the length of the cable is disclosed herein. This apparatus includes a main body or cable follower which is interconnected with the... | 09/13/1983 |
| 4385667 | Cable reaming apparatus The technique for replacing an existing underground cable and a specific apparatus for doing so are disclosed herein. The apparatus includes a main body or cable follower which is interconnected with the cable to be replaced for slidable movement along th... | 05/31/1983 |
| 4372161 | Pneumatically operated pipe crawler A pneumatically operated pipe crawler for transporting inspection equipment along the interior of a pipe comprises an elongate cylindrical tube of flexible resilient material, such as latex rubber, the tube being partitioned by longitudinally spaced plugs... | 02/08/1983 |
| 4261500 | Modular apparatus for the feeding of electrode wire through great distances A multi-module system for advancing an electrode wire from a supply location to a field welding station via a plurality of spaced conduit sections is described. Each conduit section is succeeded and preceeded by a plurality of wire-advancing heads, with t... | 04/14/1981 |
| 4207872 | Device and method for advancing an endoscope through a body passage A device and its method of operation for assisting in the advancement of an endoscope through the colon or other body passage. The device includes a sleeve having an annular chamber defined in part by an outer wall of elastomeric material. A multiplicity ... | 06/17/1980 |
| 4071086 | Apparatus for pulling tools into a wellbore A pulling tool apparatus for helping equipment descend down a wellbore, such as logging tools being dropped into a deviated wellbore. A first embodiment employs a mass slidably located inside the pulling tool which is acted on so that it is propelled in a... | 01/31/1978 |
