Ligco Trademarks

LIGCO
MINED LIGNIN USED AS A SUPPLEMENTARY DISPERSANT AND EMULSIFIER IN OIL DRILLING MUDS
Cancelled  ·  May 25, 1959  ·  72074442  · 
LIGCON
DRILLING FLUID ADDITIVE USEFUL IN THE CONTROL OF FILTRATION AND IN DISPERSING AND EMULSIFYING COMPONENTS OF THE DRILLING FLUID
Registered  ·  December 21, 1965  ·  72235008  ·