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:
Jan. 23, 2001
Filed:
Sep. 04, 1998
Applicant:
Inventor:
Jyri J{umlaut over (a)}rvenkyl{umlaut over (a)}, Hollola, FI;
Assignee:
Uponor Innovation AB, , SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L 9/147 ;
U.S. Cl.
CPC ...
F16L 9/147 ;
Abstract
The invention relates to a co-extruded multilayer plastic pipe comprising an inner pipe and an outer pipe and between them a middle layer of a softer material than the inner pipe. The invention also relates to a method of producing a co-extruded multilayer pipe in a multilayer extruder, and an apparatus for producing the co-extruded multilayer pipe.