US PATENT SUBCLASS 507 / 274
.~.~ Inorganic component contains phosphorous

Current as of: June, 1999
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507 /   HD   EARTH BORING, WELL TREATING, AND OIL FIELD CHEMISTRY

200  DF  WELL TREATING {4}
269  DF  .~ Contains inorganic component other than water or clay {8}
274.~.~ Inorganic component contains phosphorous

DEFINITION

Classification: 507/274

Inorganic component contains phosphorous:

(under subclass 269) Composition wherein the inorganic component has phosphorous.

SEE OR SEARCH THIS CLASS, SUBCLASS:

277, for a composition containing normal seawater brine without the addition of any of the components proper for subclasses 201 through 276 in this class.