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. 25, 1983
Filed:
Jun. 29, 1981
Randy S Baker, Long Beach, CA (US);
H R Price, Calgary, CA;
Hughes Tool Company, Houston, TX (US);
Abstract
An improved drag string unit is shown for use with well bore drill stem test tools of the type which have an inflatable packer and an integral pump. The drag spring unit has an outer drag spring housing and an inner mandrel slidably received within the drag spring housing. Ratchet surfaces associated with the outer housing and inner mandrel are positionable between an engaged position which allows the pump to be activated to pump up the packers and a disengaged position which prevents activation of the pump. Vent means are alignable between the inner mandrel and outer housing when the ratchet surfaces are disengaged allowing the packers to vent to the well bore.