US PATENT SUBCLASS 148 / 253
.~.~.~ Contains phosphorus


Current as of: June, 1999
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148 /   HD   METAL TREATMENT

95  DF  PROCESS OF MODIFYING OR MAINTAINING INTERNAL PHYSICAL STRUCTURE (I.E., MICROSTRUCTURE) OR CHEMICAL PROPERTIES OF METAL, PROCESS OF REACTIVE COATING OF METAL AND PROCESS OF CHEMICAL-HEAT REMOVING (E.G., FLAME-CUTTING, ETC.) OR BURNING OF METAL {17}
240  DF  .~ Processes of coating utilizing a reactive composition which reacts with metal substrate or composition therefore {12}
243  DF  .~.~ Liquid reactive coating composition utilized {16}
253.~.~.~ Contains phosphorus {6}
254  DF  .~.~.~.~> Liquid composition applied prior to reaction of metal substrate with phosphorus (e.g., cleaning, activating, etc.)
255  DF  .~.~.~.~> With additional coating composition containing an atom of chromium, phosphorus or sulfur
256  DF  .~.~.~.~> Specified liquid or gaseous coating composition applied after reaction with phosphorus {1}
258  DF  .~.~.~.~> Contains an atom of chromium
259  DF  .~.~.~.~> Contains organic additive other than for pH control {1}
261  DF  .~.~.~.~> Contains an atom of arsenic, boron or metal atom other than alkali metal {1}


DEFINITION

Classification: 148/253

Contains phosphorus:

(under subclass 243) Subject matter wherein the liquid reactive coating composition containing elemental phosphorus or an inorganic phosphorus compound is applied to a metal substrate and reacts therewith.

(1) Note. In most instances the phosphorus material reacts with the metal substrate. This is not a necessary criteria for classification in this area. It is possible that a composition containing a phosphorus atom will react with the metal wherein the phosphorus atom itself does not react. In subclasses 254, 256 and 257 the phosphorus must react.