US Patent Class 507-- EARTH BORING, WELL TREATING, AND OIL FIELD CHEMISTRY-- MAIN HEADINGS

US Patent Class 507
EARTH BORING, WELL TREATING, AND OIL FIELD CHEMISTRY-- Main Headings

		CLASS NOTES
90	DF	PREVENTING CONTAMINANT DEPOSITS IN PETROLEUM OIL CONDUITS
100	DF	EARTH BORING {4}
200	DF	WELL TREATING {4}
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		CROSS-REFERENCE ART COLLECTIONS RELATING TO SUBCLASSES 90 THROUGH 277
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901	DF	ORGANICALLY MODIFIED INORGANIC SOLID
902	DF	CONTROLLED RELEASE AGENT
903	DF	CROSSLINKED RESIN OR POLYMER
904	DF	PROCESS OF MAKING FLUIDS OR ADDITIVES THEREFOR
905	DF	NONTOXIC COMPOSITION
906	DF	SOLID INORGANIC ADDITIVE IN DEFINED PHYSICAL FORM
907	DF	INDICATING MEANS (E.G., DYE, FLUORESCING AGENT, ETC.)
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		CROSS-REFERENCE ART COLLECTIONS RELATING TO SUBCLASSES 100 THROUGH 145.
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910	DF	EARTH BORING FLUID DEVOID OF DISCRETE AQUEOUS PHASE
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		CROSS-REFERENCE ART COLLECTIONS RELATED TO SUBCLASSES 200 THROUGH 277
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920	DF	BIOCIDAL
921	DF	SPECIFIED BREAKER COMPONENT FOR EMULSION OR GEL
922	DF	FRACTURE FLUID {2}
925	DF	COMPLETION OR WORKOVER FLUID
926	DF	PACKER FLUID
927	DF	WELL CLEANING FLUID {3}
933	DF	ACIDIZING OR FORMATION DESTROYING {1}
935	DF	ENHANCED OIL RECOVERY {1}
939	DF	CORROSION INHIBITOR
940	DF	FREEING STUCK OBJECT FROM WELLBORE