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:
Aug. 06, 1991
Filed:
Mar. 30, 1990
Britt O Braddick, Houston, TX (US);
Texas Iron Works, Inc., Houston, TX (US);
Abstract
A single wiper is releasably and sealably positioned adjacent the lower end an operating string and locked therewith to prevent premature release from the operating string upon manipulation of the operating string. The sealing relationship between the wiper and the operating string prevents communication of operating string pressure from the operating string to the resilient ribs of the wiper adjacent the position of the wiper on the operating string. When a pump down plug is sealably seated within the bore of the wiper, fluid pressure is confined to act on a piston between the operating string and the wiper to unlock the wiper from the operating string so that it may be released therefrom.