US PATENT SUBCLASS 507 / 235
.~.~ Organic component contains phosphorus attached directly or indirectly to carbon by nonionic bonding

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}
235.~.~ Organic component contains phosphorus attached directly or indirectly to carbon by nonionic bonding {3}
236  DF  .~.~.~> Organic component contains nitrogen attached directly or indirectly to carbon by nonionic bonding
237  DF  .~.~.~> Organic component contains a direct carbon to phosphorous nonionic bond (e.g., phosphonate, etc.)
238  DF  .~.~.~> Organic component is a phosphate ester

DEFINITION

Classification: 507/235

Organic component contains phosphorous attached directly or indirectly to carbon by nonionic bonding:

(under subclass 203) Compositions wherein phosphorous is attached to carbon directly or indirectly by nonionic bonding.

(1) Note. A composition with phosphorous as part of a mere counterion to an ionic compound is not a basis for including such a composition in this subclass. For example, a quaternary ammonium phosphate is included in subclass 240.