Patents Assigned to Jeffery James Cheetham
  • Dental amalgam alloy
    Patent number: 4859240
    Abstract: The present invention relates to a dental amalgam alloy comprising by weight, as alloying ingredients, from about 30 to 70% silver, from about 20 to 35% tin, from about 10 to 30% cooper, from 0 to about 5% indium, from 0 to about 1% zinc and from about 0.01 to 2% of a Group VIII metal selected from the group consisting of platinum, rhodium, iridium and ruthenium.
    Type: Grant
    Filed: June 5, 1987
    Date of Patent: August 22, 1989
    Assignee: Jeffery James Cheetham
    Inventor: Graham J. Parker