The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 30, 1995
Filed:
Jun. 28, 1994
Donald A Smith, Innisfail, CA;
Canadian Fracmaster Ltd., , CA;
Abstract
There is described an improved method and apparatus for releasably connecting one part of a tool string to another, comprising a tubular housing having an uphole and a downhole end, a piston slidably disposed within the tubular housing for longitudinal movement therein between a first position and a second downstream position, the piston having a sealable bore formed therethrough for passage of a pressurized fluid, first connectors for releasably maintaining the piston in the first position thereof prior to sealing of the bore in the piston, a tubular bottom sub having an uphole end for concentric connection to the downhole end of the tubular housing, and a downhole end adapted for connection to a tool string and second connectors for releasably connecting the tubular housing to the bottom sub to normally prevent axial separation therebetween, wherein the piston, upon sealing of the bore to block the passage of pressurized fluid therethrough and in response to the pressure of the fluid then acting on the piston, is movable from its first to its second position to allow release of the second connectors, whereupon the tubular housing and the bottom sub become separable.