Patents Represented by Attorney, Agent or Law Firm James G. Ulber
  • Safety helmet assembly
    Patent number: 6317895
    Abstract: A safety helmet having a rigid outer shell, a shock absorbing layer inside of the outer shell, and a shield layer fabricated from a strong and lightweight material positioned between the outer shell and the shock absorbing layer. The shield layer is preferably free to move relative to the outer shell in a direction toward the shock absorbing layer.
    Type: Grant
    Filed: July 14, 1999
    Date of Patent: November 20, 2001
    Assignee: Mine Safety Appliances Company
    Inventors: Richard A. Erth, Layton A. Wise