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:
Jul. 31, 2012
Filed:
Aug. 11, 2006
Mario A. Perez, Burnsville, MN (US);
Thomas L. Wood, Hudson, WI (US);
Salvatore M. Attaguile, Cedar Park, TX (US);
Mario A. Perez, Burnsville, MN (US);
Thomas L. Wood, Hudson, WI (US);
Salvatore M. Attaguile, Cedar Park, TX (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A method for joining sections of coated pipe comprises providing two sections of metal pipe, each section of metal pipe having at least a first polymeric coating on its outer surface. The first polymeric coating comprises a first polymer coating selected from the group consisting of a first epoxy/olefin interpenetrating polymer network (IPN) layer, a thermoplastic layer, and a thermosetting layer. The sections of metal pipe are aligned end-to-end and bonded together to form a desired closure. A second polymeric coating comprising a layer of epoxy/olefin semi- or full-IPN is applied to the closure and to any desired additional area of coated pipe to form a seam and to secure the joint. A method for patching a damaged coated pipe using a patch comprising a polyolefin/epoxy semi- or full IPN is also disclosed. A kit comprises a semi-IPN and/or full-IPN repair stick, sheet-like patch, melt, or powder, which is useful to repair damage to a polymer coated metal pipe or to girth weld together ends of two sections of a polymer coated metal pipe.