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. 04, 2000
Filed:
Nov. 05, 1997
Applicant:
Inventors:
Assignee:
Sumitomo Metal Industries, Ltd, Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
138146 ; 138145 ; 138143 ;
Abstract
A lubricant surface-treated steel pipe for hydroforming use in which at least its outer surface is coated with a lubricating organic resin to a thickness of 0.5 .mu.m to 100 .mu.m. The surface-treated steel pipe provides excellent prevention of galling and excellent lubrication in hydroforming. Also, hydroforming can be started immediately after the surface-treated steel pipe is cut into short pieces.