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. 10, 2004
Filed:
Jul. 30, 2002
John A. Sinsel, Weirton, WV (US);
Mark V. Loen, Steubenville, OH (US);
Michael S. Bailey, Landenberg, PA (US);
Weirton Steeel Corporation, Weirton, WV (US);
Abstract
Flat-rolled steel strip, free of surface iron oxide, is provided with a corrosion-protection metallic coating on both surfaces, followed by continuous-line polymeric coating operations in which a single surface is pre-treated so as to activate that surface for adhesion of molten extruded thin-film polymeric material for in-line travel. Polymeric materials are formulated to provide maleic-anhydride modified polypropylene, which is melted and pressurized for extrusion as a molten thin-film tie-layer for first contacting that activated surface; and, thin-film intermediate and finish layers are each formulated to contain a selected percentage of polybutylene; which are extruded as molten films in overlaying relationship to said first contacting tie-layer. Polymeric finish-processing re-melts the polymeric materials; and, following a selected interval of in-line travel in that re-melted condition, rapidly cools those polymeric materials through glass-transition temperature so as to establish amorphous characteristics throughout said materials. End-usage product comprise flat-rolled mild steel can stock for fabricating one-piece drawn, and drawn and ironed, can bodies with interior polymeric coating and an exterior corrosive-protection metal coating, such as matte-finish electrolytic tin plate.