Patents Examined by Jeffery Hofbass
  • Intrinsically-safe roof hazard alert module
    Patent number: 6469619
    Abstract: A light weight, self-contained, portable, intrinsically-safe warning device for providing warning to personnel of an unsafe condition is provided. This warning device is especially adapted for attachment to the roof of a mine to indicate unsupported roof conditions or other unsafe conditions.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: October 22, 2002
    Assignee: The United States of America as represented by the Department of Health and Human Services
    Inventors: William D. Mayercheck, Albert L. Brautigam