Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 6752222 | Downhole percussion drills Provided is a downhole percussion drill, which is installed at an end portion of a drillstring and performs drilling by giving impact blows to a drill bit at the bottomhole, which includes a hydraulic hammering mechanism 7 which uses oil having high lubricati... | 06/22/2004 |
| 5957220 | Percussion drill assembly A compressor piston divides a first compartment into two compression chambers, while a hammer piston divides a second compartment into two drive chambers, each of the compression chambers being connected to a respective one of the drive chambers to form a... | 09/28/1999 |
| 5107933 | Hydraulic drilling outfit A hydraulic drilling outfit has a hydraulically driven hammer drill which is fastened pivotally to a hydraulic thrust unit. A control for the hydraulics utilizes the flushing water for the drill bit as the power-source for all of the motions executed by t... | 04/28/1992 |
| 4917194 | Improved downhole hammer A downhole hammer is provided comprising a casing having a top sub at one end and a drill bit and support at the other end. A central tube is extended therethrough to define an annular space between the casing and the tube. A reciprocating piston is accom... | 04/17/1990 |
| 4153119 | Directional drilling apparatus A device for facilitating directional drilling of small diameter holes radially of a mine long hole comprising a segmented sleeve for movement through a guide channel in a main drill unit. A small bit is driven by a flexible shaft which passes through the... | 05/08/1979 |
| 4074775 | Power swivel A power swivel particularly adapted for downhole cementing operations. The power swivel includes a housing having a fluid passageway therethrough and a stem assembly mounted for rotational movement with respect to the housing and having a fluid passageway... | 02/21/1978 |
| 4060334 | Machine for machining bars and tubes A machine for machining bars, rods, tubes and similar articles, e.g. by cutting a thread thereinto is provided with a cutting head journalled by means of a spindle or the like on a housing, and is also provided with a motor, e.g. an electric motor, which ... | 11/29/1977 |
