Patents Assigned to BNP Parlbas
  • Patent number: 7118634
    Abstract: The invention relates to a low-pressure carburising method comprising alternating low-pressure enrichment steps and diffusion steps in the presence of a neutral gas. During the enrichment steps, an enriching gas and neutral gas mixture is used, the proportion of the neutral gas being between 5 and 50% by volume of the enriching gas. The enriching gas can be, for example, acetylene (C2H2).
    Type: Grant
    Filed: February 22, 2002
    Date of Patent: October 10, 2006
    Assignee: BNP Parlbas
    Inventors: Aymeric Goldsteinas, Laurent Pelissier