Patents Assigned to Millspin Limited
  • Ion beam dosimetry
    Patent number: 4831271
    Abstract: A work piece 13 is implanted with N.sup.+ ions from a source 1 to improve its surface hardness. The dosage of implanted ions is monitored by a member 14 which changes its color in dependence upon the dose. The member 14 may comprise a tantalum plate 15 with an anodic oxide layer 16 of a thickness to produce interference colors. In accordance with the invention this layer 16 changes colors as a function of the ion dosage.
    Type: Grant
    Filed: August 3, 1987
    Date of Patent: May 16, 1989
    Assignee: Millspin Limited
    Inventors: Geoffrey Dearnaley, Antony E. Hughes, Steven Rosenbaum