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| Number | Title | Issue Date |
| 4436177 | Truck operator's cab with equipment control station An operator cab for an over-the-road truck includes a forward disposed driver's compartment and a separate equipment control station disposed rearwardly of the driver's compartment. The control station includes a control panel disposed below a window in t... | 03/13/1984 |
| 4417846 | Traveling block elevator latch assembly Apparatus for supporting a length of pipe to accommodate pipe stabbing and removal operations during launching or recovery of the length of pipe is disclosed. The apparatus is designed for use with a hoist rig of the type having a mast structure secured t... | 11/29/1983 |
| 4324194 | Stabilized hoist rig for deep ocean mining vessel A stabilized hoist rig for lowering, lifting, and supporting a pipe string from a vessel or floating platform in a deep ocean is disclosed. A resilient bearing member is disposed in load supporting relation intermediate the vessel and the hoist rig. A pow... | 04/13/1982 |
| 4290495 | Portable workover rig with extendable mast substructure, platform mounted drawworks and adjustable wellhead anchor A portable workover rig for handling a pipe string in a well casing includes a base platform and a collapsible mast which is movable from a reclining transport position to an erect elevated position of use. The mast is supported for free-standing operatio... | 09/22/1981 |
| 4257456 | Pressure compensated spool valve A control valve for actuating a double acting hydraulic jack or lift cylinder features a pressure compensator assembly for limiting the rate of retraction of the cylinder and piston relative to each other under heavy loading conditions to prevent dropping... | 03/24/1981 |
| 4128229 | Hoist apparatus with dual mast structure and compound power transmission system A hoist rig for lifting and lowering a pipestring is disclosed. The rig includes first and second vertical mast structures, a traveling block for engaging and transporting the pipestring, and a compound power transmission system for raising and lowering t... | 12/05/1978 |
