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:
Nov. 07, 2000
Filed:
Jun. 09, 1999
John P Collier, Franklin Lakes, NJ (US);
The BOC Group, Inc., New Providence, NJ (US);
Abstract
A method of producing a cylindrical shell in which a billet of circular, transverse cross-section is provided with of first and second sections formed of steel and a liner insert material, respectively. The first section has an end portion and a recess defined within the end portion. The second section is shaped to nest within the recess of the end portion of the first section. The billet is extruded into a cylindrical shell by a billet piercing operation so that the first section produces an outer cylindrical form and the second section produces a liner insert for the cylindrical form. The recess and therefore the second section (forming the liner insert) can be a frustum of a cone. The material for the liner insert may be a corrosion resistant nickel or nickel alloy, Hastalloy C-22, tantalum, titanium, gold or platinum.