Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7299885 | Downhole drill string having a collapsible subassembly and method of loosening a stuck drillstring A method and apparatus for allowing a downhole drill string to be stuck at one location and continue to rotate above the stuck section. The apparatus provides a method for collapsing the stuck subassembly by reducing its outside diameter. Simultaneous with the subas... | 11/27/2007 |
| 7093677 | Percussion drill head The invention relates to a method for horizontal drilling with a percussion implement and a percussion head or percussion head element mounted in a movable manner relative to the percussion implement, the percussion impulse being transmitted in at least three steps.... | 08/22/2006 |
| 7090038 | Bedrock drilling and excavating apparatus A bedrock drilling and excavating apparatus receives power from a rotational power source to drive a drill to strike and shatter bedrock under the gravity of the apparatus and reciprocal vibrations of a pneumatic unit located on the apparatus. The apparatus includes... | 08/15/2006 |
| 7066251 | Hydraulic jar lock An internal, positive engagement lock that locks a tool, such as a hydraulic drilling jar, in the fully open position when the tool is racked back and when tripping in and out of the hole close to the surface. The lock mechanism is spring biased into a locked positi... | 06/27/2006 |
| 7044240 | Torque absorber for downhole drill motor A torque absorber is disposed on a drill string near the motor. The torque absorber automatically adjusts the weight on a drill bit and reduces the likelihood of motor stall caused by resistance to drill bit rotation. The torque absorber includes an upper unit assem... | 05/16/2006 |
| 6942046 | Bore bit for very hard material An apparatus including a bore bit comprising a bottom part having an active bottom face and a top face substantially parallel to the active face; a top part fixed to suspension cables and having a bottom face facing the top face of the bottom part; a member for limi... | 09/13/2005 |
| 6722454 | Device for drilling, in particular percussion drilling or rotary percussion drilling, boreholes A device for drilling holes, including a drill bit with a drilling or breaking surface, a drill rod for introducing a rotary or percussive force and for introducing a rinsing or cooling fluid into the drill bit and a sheath pipe which defines a hollow space between ... | 04/20/2004 |
| 6659202 | Steerable fluid hammer An apparatus and method for directional drilling utilizing a fluid hammer. The fluid hammer is coupled to a bent steering member which, in turn, is coupled to a drill string. The bent steering member includes means for rotating the fluid hammer independen... | 12/09/2003 |
| 6557653 | Working tool for a percussion power tool A working tool for use with a percussion power tool and including a cushioning elongate stem (3), and a head (4) connected with the stem (3) for joint rotation therewith and for a limited axial displacement relative thereto, with the tool head (4) being a... | 05/06/2003 |
| 6488105 | Method and apparatus for subsurface exploration A subsurface explorer (SSX) for exploring beneath the terrestrial surface of planetary bodies such as the Earth, Mars, or comets. This exploration activity utilizes appropriate sensors and instrument to evaluate the composition, structure, mineralogy and ... | 12/03/2002 |
| 6164393 | Impact tool A hydraulic impact tool for use in a well, such as an oil or gas well, comprising a movable hammer which is arranged to prestress a spring by means of a hydraulic piston (16) provided with a through channel (20), and in which a movable sealing body (22, 4... | 12/26/2000 |
| 5918690 | Bottom rotation shaft actuator An actuator for effecting bottom hole rotation consisting of an upper wash pipe having a spiral groove mandrel that is in operative association with a ball clutch assembly that is secured to the upper wash pipe. The weight placed on the actuator at the wa... | 07/06/1999 |
| 5881827 | Extendable bit Extendable bit teeth are supported by the guide grooves formed on the end face at the point of a bit body in such a manner as to be slidable. The extendable bit teeth slide along the guide grooves in an excavating direction to thereby project from the end... | 03/16/1999 |
| 5156223 | Fluid operated vibratory jar with rotating bit A downhole oil well tool uses impact, reciprocal drilling and an improved rotating bit or like working member, receiving both fluid pressure and weight from an elongated pipe string with a flow bore in order to drive the tool. A valve within tool housing ... | 10/20/1992 |
| 4958691 | Fluid operated vibratory jar with rotating bit A downhole oil well tool uses impact, reciprocal drilling and an improved rotating bit or like working member, receiving both fluid pressure and weight from an elongated pipe string with a flow bore in order to drive the tool. A valve within tool housing ... | 09/25/1990 |
| 4715454 | Mechanical directional drilling jar with swivel means A drilling jar is disclosed. The jar has particular application in directional drilling operations and includes a swivel which allows the drilling jar to operate substantially independently of any right hand torque that becomes trapped in the drill string... | 12/29/1987 |
| 4688649 | Mechanical drill string jar A mechanical jar used primarily on drill strings, in earth boreholes, to aid in freeing drill strings stuck in a well bore. A telescoping drill string component is constrained in a selected telescoped condition by a biased lock until enough axial stress i... | 08/25/1987 |
| 4662460 | Rotary drilling jar The rotary drilling jar includes inner and outer mandrels releaseably locked against relative longitudinal movement. The inner mandrel is connected to the drilling string and the outer mandrel is connected to the drill bit or other well tools suspended be... | 05/05/1987 |
| 4621698 | Percussion boring tool A percussion boring tool is disclosed for boring in the earth at an angle or in a generally horizontal direction. The tool has a steering mechanism substantially as shown in a copending patent application and a cylindrical body with overgage sleeves locat... | 11/11/1986 |
| 4415047 | Downhole case driving apparatus for impact drills An apparatus is described for forceably pulling a well casing down into a drilled hole from the casing bottom end during a percussion drilling procedure, through use of the percussion drill tool. An anvil is fixed to the casing and projects inwardly to co... | 11/15/1983 |
