US PATENT SUBCLASS 148 / 252
.~.~.~ Contains dicarboxylic acid or salt thereof which reacts with metal substrate

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
252.~.~.~ Contains dicarboxylic acid or salt thereof which reacts with metal substrate

DEFINITION

Classification: 148/252

Contains dicarboxylic acid or salt thereof which reacts with metal substrate:

(under subclass 243) Subject matter wherein the liquid reactive coating composition contains a dicarboxylic acid compound or salt thereof which must be chemically reactive with the metal substrate.

(1) Note. A dicarboxylic acid compound for purposes of this subclass requires the presence of two carboxylic acid groups.

A. A carboxylic acid denotes:

(A1) The C- C -OH structure wherein n is one or greater and the C- atom is not double bonded to oxygen, sulfur, selenium, or tellurium, or is not triple bonded to nitrogen.

(A2) The -C- C- C-OH structure wherein n is an integer, e.g., oxalic acid when n=[supscrpt]1[end supscrpt]

B. The salt of a carboxylic acid denotes the structure:

(B1) C- C -O-X wherein n is one or more and the (C-C-O-) group and the X component are held together primarily by ionic forces; the carbon atom bonded to the -C- group is not double bonded to oxygen, sulfur, or tellurium, or triple bonded to nitrogen.

(B2) The structure Z- C -C-O-X wherein n is an integer, Z is -C-OH or a derivative as defined in the (1) Note of this subclass and wherein the X component and the (Z- C -O-) component are held together primarily by ionic forces.