IFI

Patent Intelligence & Technology Report

Class Distribution for 1990-1999 

299 - MINING OR IN SITU DISINTEGRATION OF HARD MATERIAL (IPC E21C, E01C)

       1999  1998  1997  1996  1995  1994  1993  1992  1991  1990  Total

ATLANTIC RICHFIELD CO
          0     0     0     0     1     0     1     1     0     1      4
DRESSER INDUSTRIES INC
          0     0     0     0     0     0     0     0     1     0      1
RELIANCE ELECTRIC INDUSTRIAL CO
          0     0     0     1     0     0     0     0     0     0      1

Total     0     0     0     1     1     0     1     1     1     1      6