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Duofrac Trademarks
DUOFRAC
CHEMICAL ADDITIVES FOR ACID COMPOSITIONS USEFUL IN THE TREATMENT OF WELLS AND UNDERGROUND EARTH FORMATIONS
Registered
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June 8, 1964
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72195075
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DUOFRAC
Well Treating Service-Namely, Hydraulic Fracturing and Acidizing, With or Without a Propping Agent
Cancelled
·
October 23, 1959
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72083869
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