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:
Mar. 24, 1987
Filed:
Oct. 01, 1984
John S Davis, Sandy, UT (US);
Eastman Christensen Company, Salt Lake City, UT (US);
Abstract
An improved core catcher for use within a coring tool is provided by shaping the lower portion of the core catcher so as to form a collapsible lower section. The collapsible lower section is structurally collapsed as the core catcher is longitudinally displaced within the coring tool to exert a radially compressive force against the core and to thereby seize the core and retain it within the coring tool. In one embodiment, the collapsible lower section is resilient so that it collapses and after operation resumes its original configuration for reuse. In another embodiment, the collapsible lower section is crushable and is therefore not reusable after the first use. The reusable core catcher is devised by providing the lower section of the core catcher with a plurality of thin slots appropriately aligned and extending through the lower section of the core catcher. The nonreusable core catcher is designed to provide a plurality of crushable longitudinal segments of the lower section of the core catcher, and in one embodiment to allow the entire lower section of the core catcher to be crushable.