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. 21, 1979
Filed:
Sep. 21, 1977
Bobby J Hallmark, Fort Worth, TX (US);
Gearhart-Owen Industries, Inc., Forth Worth, TX (US);
Abstract
An improved sealing projectile for use in a borehole perforating tool of a type wherein there is an explosive charge such as one or more shaped charge units disposed in each of a plurality of chambers that are located one above the other, with a partition means between each two adjacent chambers and sealingly isolating the adjacent chambers but for a passageway in the partition means through which ignition wires are passed, with a sealing projectile driven into sealing relation with the lower end portion of the passageway upon detonation of the explosive charge in the lower one of the adjacent chambers. The improved sealing projectile is provided a guide portion having a cylindrical exterior surface adapted for mating with the interior surface of said passageway and having slot means extending longitudinally of the guide portion from its outer end inwardly a distance less than the length of said guide portion but sufficient to permit an end portion of the guide portion to be disposed within said passageway while permitting ignition wires to pass from said passageway through said slot means to the lower one of said adjacent chambers, and a sealing portion merging with said guide portion.