Duovis Trademarks

DUOVIS
CHEMICAL ADDITIVE FOR DRILLING FLUIDS
Cancelled  ·  October 30, 1986  ·  73629047  · 
DUOVISC
ophthalmic pharmaceutical preparations; namely, viscoelastic solutions
Registered  ·  July 9, 1991  ·  74183443  · 
duovisc