US PATENT SUBCLASS 507 / 254
.~.~.~.~ The sulfur is part of a sulfate group

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

200  DF  WELL TREATING {4}
203  DF  .~ Contains organic component {17}
252  DF  .~.~ Organic component contains sulfur attached directly or indirectly to carbon by nonionic bonding {2}
253  DF  .~.~.~ Organic component contains ether linkage (i.e., C-O-C) {2}
254.~.~.~.~ The sulfur is part of a sulfate group

DEFINITION

Classification: 507/254

The sulfur is part of a sulfate group:

(under subclass 253) Compositions wherein the sulfur in the organic component is part of a sulfate group.

(1) Note. The presence of an inorganic anion sulfate group is not a basis for placement in this subclass. See the (1) Note in subclass 252.