Patents by Inventor Erland Lundstrom

Erland Lundstrom has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Bow-formed bumper, a method of forming a bow-formed bumper, and a method of hydroforming a blank therefor
    Patent number: 6299709
    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.
    Type: Grant
    Filed: May 19, 2000
    Date of Patent: October 9, 2001
    Assignee: SSAB Hardtech AB
    Inventor: Erland Lundström
  • Method of producing a sheet steel product such as a reinforcement element in a larger structure
    Patent number: 5916389
    Abstract: A product of sheet steel is formed in a pair of cooled tools when hot and is then hardened to a martensitic structure while still in the tools. In this manner, the tools function as a fixture while the steel is hardening. The steel is kept mild in the areas in which it is to be machined, for example punched. Inserts in the tools are used to prevent rapid cooling of the steel sheet and thereby a martensitic structure in the areas adjacent the inserts. The same effect can be obtained by recesses in the tools so that there will be a gap between the sheet steel and the tools.
    Type: Grant
    Filed: June 5, 1997
    Date of Patent: June 29, 1999
    Assignee: SSAB Hardtech AB
    Inventor: Erland Lundstrom