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:
Dec. 09, 2003
Filed:
Jun. 14, 2001
Applicant:
Inventors:
Katsuhiro Imasaki, Kyoto, JP;
Hiroyuki Furukawa, Kyoto, JP;
Toshitsugu Ookubo, Kyoto, JP;
Sadao Oiko, Kyoto, JP;
Assignee:
Suncall Corporation, Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L 9/14 ;
U.S. Cl.
CPC ...
F16L 9/14 ;
Abstract
An outer pipe and an inner pipe are formed by drawing. Inner pipe is inserted into outer pipe and a metal core is inserted into inner pipe From this state, drawing is performed so that outer pipe presses tightly against inner pipe Metal core is pulled out, resulting in a two-layer clad pipe Alternatively, a two-layer clad pipe can also be made by drawing outer pipe and inner pipe without inserting metal core