US PATENT SUBCLASS 148 / 276
.~.~ Coating during or after metal oxide formation

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}
276.~.~ Coating during or after metal oxide formation

DEFINITION

Classification: 148/276

Coating during or after metal oxide formation:

(under subclass 240) Subject matter wherein a reactive composition is applied to a metal substrate and reacts at the surface to form an oxide layer and wherein concurrent with or subsequent to said oxide formation an additional coating process is involved.

(1) Note. This subclass provides for processes and compositions wherein the initial step of forming the metal oxide is not claimed (it must be disclosed as formed by a process proper under subclass 240) and the claim itself is to the other coating steps required for this subclass and compositions therefore.