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:
Sep. 13, 1988
Filed:
Aug. 11, 1986
Applicant:
Inventor:
Richard M Ward, LaPorte, TX (US);
Assignee:
Dresser Industries, Inc., Dallas, TX (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166297 ; 166 551 ; 175-454 ;
Abstract
Method and apparatus for firing perforating apparatus in a borehole. A pressure actuated firing assembly is run into the borehole on th eend of a cable and latched onto a perforating apparatus. The cable is removed and pressure is applied to the tubing annulus. At a predetermined pressure the firing asembly is armed. After arming pressure is released from the tubing annulus during a time delay period before the firing assembly impacts a percussion firing head to thereby detonate the perforating apparatus.