Patents by Inventor Sten Lennart Bergh

Sten Lennart Bergh 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).

  • Process for the manufacture of a high strength chain and the product obtained thereby
    Patent number: 4002509
    Abstract: The invention relates to a process for the manufacture of a chain having an ultimate tensile strength of at least 90 kg/mm.sup.2 and an impact strength at .+-. 0.degree. C of at least 2.8 kgm starting from a steel ingot containing C, Si, Mn, Cr, Mo, N, Al, Nb (Cb), and Fe in certain amounts, said ingot being hot rolled to a rod of a dimension suitable for use in a chain, cut into pieces of adjusted length and after resistance heating to 700.degree.-900.degree. C said pieces being bent and flash-butt welded to connected links of a chain, said chain being then normalized by heating to a temperature of 700.degree.-900.degree. C and then cooled in air. The invention also covers chains prepared by the process.
    Type: Grant
    Filed: December 22, 1975
    Date of Patent: January 11, 1977
    Assignee: Stora Kopparbergs Bergslags Aktiebolag
    Inventors: Barbro Marie Rohlin, Sten Lennart Bergh, Gustav Nils Herman Westerberg