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




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Current as of: June, 1999
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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