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:
Sep. 20, 1988
Filed:
Oct. 05, 1987
Gulzar A Qureshi, Tinley Park, IL (US);
David A Shotts, Naperville, IL (US);
Allied Tube & Conduit Corporation, Harvey, IL (US);
Abstract
A method for making endless lengths of nylon coated metal tubing which coating has high mechanical strength characteristics and a low gloss surface finish. The method includes passing the formed tubing through a first powder coating region and applying a layer of nylon generally uniformly surrounding the circumference of the tubing. This first nylon powder coating is heated sufficiently to cause the nylon coating to achieve complete melt-flow into a continuous first nylon coating region which would have a relatively high gloss. The coated tubing is next passed through a second powder coating region with the surface temperature of the first coating still above the melting temperature of the nylon. At this second coating region a second powder coating of the same type of nylon is applied. The second coating is cooled below the melting point of the nylon before the second coating completely melts leaving the outer surface with a very low gloss surface finish.