Patents Represented by Attorney Birch Thompson

Find this attorney in the Justia Lawyer Directory

  • Cutters for use in mineral mining
    Patent number: 4637658
    Abstract: A floor cutter bit for a coal plough has a body carrying a pair of hard metal plates which define a coal face cutting edge and a floor cutting edge. A hard metal pin locates between the plates and receives end zones of the plates within recesses.
    Type: Grant
    Filed: August 2, 1985
    Date of Patent: January 20, 1987
    Inventors: Wolfgang Annipajo, Oswald Breuer, Christoph Rassmann