Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 7000502 | Drillpipe spinner The invention relates to an improved drill pipe spinner. The improved spinner may be used as a stand-alone piece of pipe handling equipment or may be used in an Iron Roughneck. The spinner comprises a pair of clamping arms that are movable between an open position a... | 02/21/2006 |
| 6698532 | Piercing apparatus A piercing apparatus compact in size having a decreased number of hoses is suited for use as an iron runner port-opening machine for a blast furnace or the like furnace in an iron mill. The piercing apparatus executes the piercing by moving back and forth... | 03/02/2004 |
| 6601655 | Piercing apparatus A piercing apparatus compact in size having a decreased number of hoses is suited for use as an iron runner port-opening machine for a blast furnace or the like furnace in an iron mill. The piercing apparatus executes the piercing by moving back and forth... | 08/05/2003 |
| 5924498 | Pressure converter III A pressure amplifier can be mounted above a drill bit at the lower end of a drill pipe for generating an increased fluid pressure in a drilling fluid flow to, for example, obtain an increased drilling effect, A reciprocating piston in a cylinder has at on... | 07/20/1999 |
| 5617924 | Arrangement for tightening screw connections An arrangement for tightening screw connections comprises a screw spindle turnable by a screw tool, at least two-stage rotary drive for the screw spindle, the drive providing a coarse driving for pre-tightening of a screw connection and a fine driving for... | 04/08/1997 |
| 5524713 | Drill rig having alternate spindle drive A drill rig includes a main engine which drives a drilling spindle through a clutched transmission. A protective cage surrounds the spindle when the transmission is in gear to prevent workmen from being injured by drilling tools. An auxiliary drive motor ... | 06/11/1996 |
| 5437338 | Hydraulic drive unit for driving a drilling tool This invention relates to a drive unit comprising a frame; a rotating shaft, a first fluid motor presenting a cam fixed with respect to the frame; and a cylinder block fast with the shaft driven by the first motor at a first speed of rotation. According t... | 08/01/1995 |
| 4719978 | Earth drilling device To rotate a pipe (17) to be urged into the ground, a rotary disk (20) clamped at said pipe (17) is pivotable on a table (19) which carries two groups of driving cylinders (40, 41). While the first group is operative to carry out the working stroke in orde... | 01/19/1988 |
| 4221269 | Pipe spinner A pipe spinner for spinning drill pipe as used to dig deep wells includes a yoke with a torque arm. Three self-contained rotary hydraulic motors having urethane coated rollers on the exterior thereof are mounted upon the spinner, one in the central area o... | 09/09/1980 |
