Patents by Inventor Lutz Hollenberg

Lutz Hollenberg 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).

  • Patent number: 5156691
    Abstract: The invention relates to a process for improving the cold formability of hot rolled or cold rolled heat-treatable steels.The characterizing feature of the invention is that with a composition of (in % by weight)0.32-0.54% C0.05-0.40% Mn0.41-1.5% Si0.02-0.15% Almaximum 0.05% Crmaximum 0.05% Smaximum 0.03% Pmaximum 0.02% Nresidue iron and unavoidable impuritiesprior to the final cold forming and quench hardening with subsequent tempering is performed for at least 15 hours at temperatures between 620.degree. and 680.degree. C. to graphitization, while with a composition of0.55-1.3% C0.20-0.30% Mn0.41-0.90% Si0.02-0.15% Almaximum 0.05% Crmaximum 0.010% Smaximum 0.03% Pmaximum 0.02% Nresidue iron and unavoidable impuritiessaid annealing lasts for at least 8 hours.
    Type: Grant
    Filed: September 17, 1990
    Date of Patent: October 20, 1992
    Assignee: Thyssen Stahl AG
    Inventors: Lutz Hollenberg, Cestmir Lang, Wolfgang Muschenborn