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:
May. 03, 2005
Filed:
Apr. 09, 2002
Applicants:
Donald W. Smith, Forest, VA (US);
Calvin D. Lundeen, Lynchburg, VA (US);
Inventors:
Donald W. Smith, Forest, VA (US);
Calvin D. Lundeen, Lynchburg, VA (US);
Assignee:
Wexco Corporation, Lynchburg, VA (US);
Primary Examiner:
Int. Cl.
CPC ...
C21D009/08 ; C21D009/14 ; C21D006/00 ; B23P011/00 ; B23P015/00 ;
U.S. Cl.
CPC ...
Abstract
High pressure cylinders comprising backing steel cylinders and tool steel liners are disclosed. An annealed tool steel liner is inserted into the backing steel cylinder, followed by heat treating to harden the tool steel liner. The tool steel liner may be provided as a single continuous tube, thereby avoiding problems associated with segmented liners. The high-pressure cylinders are suitable for use as plastic and rubber extruders injection molding cylinders and the like.