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. 19, 1986
Filed:
Jun. 15, 1984
Applicant:
Inventors:
Kazuyuki Suzuki, Kimitsu, JP;
Masami Ishida, Kimitsu, JP;
Fuyuhiko Ohtsuki, Kimitsu, JP;
Yoshihiro Inuizawa, Sakai, JP;
Saburo Hinenoya, Sakai, JP;
Mansei Tanaka, Kimitsu, JP;
Yoshio Shindou, Kimitsu, JP;
Assignee:
Nippon Steel Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
428 36 ; 428418 ; 428461 ; 138143 ; 138146 ;
Abstract
A polypropylene coated steel pipe comprising a steel pipe, an adhesive layer coated on the external surface of the steel pipe, which has been subjected to a pretreatment, and a polypropylene layer coated on the adhesive layer. The outermost polypropylene layer comprises, as a main constituent, a crystalline ethylene-propylene block copolymer and the adhesive layer comprises a modified polyolefin adhesive.