Famous Patents
The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8141627 | Expandable mill and methods of use In some embodiments, apparatus useful for cleaning at least part of the interior surface of a cylindrically-shaped member disposed in a subterranean well includes a housing and a plurality of retractable mill blades supported on the housing. The mill blades of such ... | 03/27/2012 |
| 7159668 | Centralizer A centralizer 10 for mounting on a tubular member such as a section of casing, together with one or more stops 42, 48 for retaining the centralizer thereon. The stops 42, 48 are provided with profiles for engaging the centralizer to restrict rot... | 01/09/2007 |
| 7006918 | Method for stress and stability related measurements in boreholes A method for the measurement of the stresses and pressure perturbations surrounding a well, and a system for computing the optimum location for initiating a hydraulic stress fracture. The technique includes using sensors attached to the wellbore casing connected to ... | 02/28/2006 |
| 6957704 | Limit clamp for use with casing attachments A limit clamp for securing a tool to a casing having a groove in its outer surface. The limit clamp comprises a block having a base and a flange. The base is positioned in the groove to contact at least one stop in the groove and the flange extends out of the groove... | 10/25/2005 |
| 6749019 | Automatic paraffin removal unit An automatic paraffin removal unit, including a scraper body, a tumbler, an arc spring leaf and a return torque spring, and the upper and lower commutators having a sleeve, an open spacing ring and a tower spring. In operation, the scraper is clamped on a pumping ro... | 06/15/2004 |
| 6457519 | Expandable centralizer A centralizer for laterally positioning an instrument in an opening larger in diameter than the diameter of an opening through which the centralizer can freely pass. The centralizer includes spring blades affixed at one end to an outer surface of the inst... | 10/01/2002 |
| 5641018 | Apparatus and method for cementing wells An apparatus and method for cementing a pipe in a well. A wiper is engaged with a pipe section as the pipe section is lowered into the wellbore. The wiper contacts the wellbore as the pipe section is reciprocated or rotated within the wiper. The wiper con... | 06/24/1997 |
| 5358039 | Centralizer for a borehole The centralizer comprises a main assembly suitable for centering a well tool in casing, and a removable adapter assembly (75) for use in the open hole portion of a borehole. The main assembly comprises a body (30), longitudinally spaced-apart supports (36... | 10/25/1994 |
| 4557327 | Roller arm centralizer A roller arm centralizer to center a drill string in a well pipe. The arms of the roller arm centralizer include shoulders to limit movement of the arms in the direction of the centralizer body which prevents the arms from being locked in a straight line ... | 12/10/1985 |
| 4531582 | Well conduit centralizer A conduit centralizer comprises segmented, sliding means connected by a plurality of axially extending, outwardly bowed leaf springs. Each sliding means is formed by the hinged connection of a plurality of double walled segments. The ends of the leaf spri... | 07/30/1985 |
| 4520869 | Centralizer for well casings A centralizer for a well casing, and the method of producing a centralizer, for assembly in the field. The centralizer comprises two collars and a plurality of spring bows, with a bow receiving section in each collar for each bow. Aligned channels are for... | 06/04/1985 |
