US PATENT SUBCLASS 148 / 255
.~.~.~.~ With additional coating composition containing an atom of chromium, phosphorus or sulfur

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  DF  .~.~.~ Contains phosphorus {6}
255.~.~.~.~ With additional coating composition containing an atom of chromium, phosphorus or sulfur

DEFINITION

Classification: 148/255

With additional coating composition containing an atom of chromium, phosphorus or sulfur:

(under subclass 253) Subject matter wherein the process involves two or more coating steps, at least one step involves a coating composition containing a phosphorus atom, and at least one of the two or more coating steps requires a composition containing chromium or sulfur or an additional phosphorus atom.

(1) Note. The requirement for this subclass is met as long

as one of the coating steps involves a liquid coating composition containing phosphorus.

(2) Note. This subclass provides for processes and compositions wherein the step of utilizing a coating composition containing phosphorus, chromium, or sulfur is claimed and no claim specifically provides for a preliminary coating process of using a coating composition containing at least one phosphorus atom. (It must be disclosed as a preliminary treatment of the substrate.)