Patents Assigned to National Keystone Products Co.
  • Dowel pin for dental models
    Patent number: 4521188
    Abstract: A dowel pin has a plurality of facets which provide numerous planes, edges and angles to constrain the dowel pin and an associated die segment to a particular orientation with respect to the base of a dental model, and to enhance the durability of the model.
    Type: Grant
    Filed: October 14, 1983
    Date of Patent: June 4, 1985
    Assignee: National Keystone Products Co.
    Inventor: Steven Metzler