Inventor

CLARKE JAMES W

3 patents

Patents

3 patents

US4521291AJun 4, 1985

Coal extraction

COAL INDUSTRY PATENTS LTD10 citations66

US4487682ADec 11, 1984

Coal extraction

COAL INDUSTRY PATENTS LTD3 citations57

US4301015ANov 17, 1981

Filtration

COAL INDUSTRY PATENTS LTD5 citations51