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. 01, 1995
Filed:
Oct. 14, 1993
Kim A Reynolds, Berwyn, PA (US);
Markel Corporation, Norristown, PA (US);
Abstract
Disclosed is an automotive fuel conduit which comprise an inner tube, an outer tube substantially surrounding the inner tube and mechanical locking structure at the interface between the outer surface of the inner tube and the inner surface of the outer tube for preventing substantial relative movement between the inner and outer tubes. The mechanical locking structure preferably comprises a plurality of mating projections and indentations on the inner surface of the outer tube and the outer surface of the inner tube, such as grooves, cuts and ridges. The inner and outer tubes are preferably each formed of polymeric material and each contain both projections and indentations. Methods are also disclosed which comprise providing a first polymeric tubular product having projections and/or indentations in at least a portion of the external surface thereof and melt extruding over said first tubular product a second polymeric tubular product such that the polymeric material of said second tubular product flows into said indentations and/or around said projections during the extrusion process.