Inventor

FRANK DOROTHY M

US4 patents

Patents

4 patents

US4580584AApr 8, 1986

Cigarette filter

BROWN & WILLIAMSON TOBACCO CORP31 citations89

US5062434ANov 5, 1991

Cigarette paper

BROWN & WILLIAMSON TOBACCO CORP29 citations86

US4611607ASep 16, 1986

Cigarette filter

BROWN & WILLIAMSON TOBACCO CORP8 citations70

US4643206AFeb 17, 1987

Cigarette filter

BROWN & WILLIAMSON TOBACCO CORP4 citations59