US PATENT SUBCLASS 507 / 142
.~.~ Inorganic component contains phosphorous

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

100  DF  EARTH BORING {4}
140  DF  .~ Contains inorganic component other than water or clay {5}
142.~.~ Inorganic component contains phosphorous

DEFINITION

Classification: 507/142

Inorganic component contains phosphorous:

(under subclass 140) Composition wherein the inorganic component contains phosphorous.

(1) Note. The composition of this subclass must contain phosphorous other than as a mere component of a normal seawater brine.

SEE OR SEARCH THIS CLASS, SUBCLASS:

145, for a composition containing normal seawater brine without the addition of any of the components proper for subclasses 100 through 144.