Dublfold Trademarks

DUBLFOLD
edge reinforced surface media for trickling filters used in heat and mass transfer apparatus, namely, cooling towers
Cancelled  ·  October 4, 1990  ·  74102971  · 
DUBLFOLD
Edge Reinforced Surface Media for Trickling Filters Used in Heat and Mass Transfer Apparatus-Namely, Cooling Towers
Cancelled  ·  June 14, 1978  ·  73174335  ·