Class 294/86.23 - With impact means

Subclass of Class 294 - Handling: hand and hoist-line implements
Definition: Grapples combined with means to deliver a blow, or to jar
No. of patents: 4
Last issue date: 07/24/2007

Number	Title	Issue Date
7246663	Positive engagement indicator for wireline fishing operations A device and method for retrieving a tool string from downhole locations through the use of one or more engagement sensors. The one or more engagement sensors are activated by the tool string engaging an overshot device. The one or more engagement sensor may be mech...	07/24/2007
7021382	Downhole axial force generating tool An axial force generating tool for applying a force on a structure positioned within a borehole is taught. The tool includes a housing (19) sized to fit within the borehole in which the tool is required to act; an outer seal (38) disposed about the hou...	04/04/2006
5899043	Ductile-failure anchors for concrete elements The invention relates to a ductile-failure anchor (2, 32) for concrete elements (3, 39) used in construction. Each anchor (2, 32) includes a plug (4, 34) attached to a securing element (5, 5a or 55) and secured within each concrete element (3, 39). The se...	05/04/1999
4658901	Method of and apparatus for removing stuck well pipe Stuck well pipe is removed from a well bore by applying an upward pull to the stuck pipe while applying an upward jarring action to the pipe by an air hammer which applies rapid blows to a linkage mechanism connected to the pipe....	04/21/1987

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