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:
Oct. 11, 1994
Filed:
Mar. 04, 1993
Jean-Luc DeCorps, Anthony, FR;
Ting Lau, Fontainebleau, FR;
Schlumberger Technology Corporation, Houston, TX (US);
Abstract
A wireline assembly suspended from a cable is lowered down an oil well for temporary latching to a downhole assembly. Latching is provided by keys mounted in the wireline assembly to engage in a complementary recess formed in the downhole assembly and cooperating therewith via surfaces that are perpendicular to the longitudinal axis of the device. Unlocking is obtained by pulling on the cable after an electrically controlled valve has been excited. The valve then communicates two chambers delimited by a control piston inside a cylinder formed in a tubular housing supporting the keys. The tension exerted on the cable is transmitted to the control piston by a rod which actuates an unlocking collar that causes the keys to be retracted.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile