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:
Oct. 09, 2001
Filed:
May. 19, 2000
Applicant:
Inventor:
Erland Lundström, Gammelstad, SE;
Assignee:
SSAB Hardtech AB, Lulea, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 8/00 ; C21D 8/10 ;
U.S. Cl.
CPC ...
C21D 8/00 ; C21D 8/10 ;
Abstract
A blank with a closed profile is made of hardenable sheet steel and is hydroformed when hot. The tool is cooled and the blank is heated to a hardening temperature and formed so fast that it will not have time to harden before it contacts the tool and becomes rapidly cooled by the tool and by the liquid fluid so that it hardens. In this simple way, a product of high strength steel can be achieved which has a closed profile and complicated form. The product can be, for example, a bow-formed bumper.