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:
Jan. 25, 1977
Filed:
Mar. 03, 1976
James L Newman, Beaumont, TX (US);
Other;
Abstract
The specification describes a drilling jar for connection in a rotary drill string. There is a trap space in the jar for collecting the products of wear between its moving parts. The drilling jar includes a generally tubular housing assembly, which has near its bottom, a wash pipe sleeve. There is a tubular mandrel assembly extending into the housing and movable with respect to it, which has near its bottom a wash pipe that slides in the sleeve. An annular trap space is defined near the top of the sleeve between its outer surface and an inner surface of the housing. Wear products are collected in the trap space and thereby prevented from entering between the wash pipe and sleeve where they would cause abrasion.