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:
Apr. 24, 1990
Filed:
Apr. 21, 1988
Applicant:
Inventor:
Alfred Thomas, Hennef-Dambroich, DE;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29C / ; B29C / ; B29C / ;
U.S. Cl.
CPC ...
264 21 ; 73104 ; 264 402 ; 264515 ;
Abstract
A process for the production of a laminate of thermoplastic material with a multi-layer wall by co-extrusion provides that added to the material for forming at least one of the layers of the laminate is a substance which makes it possible for that layer to be rendered recognizable in the laminate by the action of physical and/or chemical means. The added substance may be a fluorescing, phosphorescing or luminescing substance so that the layer containing that substance can be rendered visible in the wall of the laminate by the action of UV radiation of appropriate wavelength.