Patents Assigned to Standardgraph Zeichengerate GmbH
  • Pen nib with powder-gasphase diffusion layer
    Patent number: 4540303
    Abstract: A nib having an ink tube of chrome nickel steel, and also a cleaning wire which likewise consists of chrome nickel steel, is subjected to surface hardening by means of a boride process.
    Type: Grant
    Filed: May 12, 1983
    Date of Patent: September 10, 1985
    Assignee: Standardgraph Zeichengerate GmbH
    Inventor: Giuseppe Gigli