US PATENT SUBCLASS 436 / 5
.~ Surface area, porosity, imperfection, or alteration

Current as of: June, 1999
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436 /   HD   CHEMISTRY: ANALYTICAL AND IMMUNOLOGICAL TESTING

2  DF  PROCESS OR COMPOSITION FOR DETERMINATION OF PHYSICAL STATE OR PROPERTY BY MEANS INCLUDING A CHEMICAL REACTION {5}
5.~ Surface area, porosity, imperfection, or alteration

DEFINITION

Classification: 436/5

Surface area, porosity, imperfection, or alteration:

(under subclass 2) Processes or compositions for chemically determining surface area of an object or part of an object; the permability of a surface; the roughness of portions of a surface; or the alteration of a surface.

(1) Note. This subclass provides for colorimetrically or fluorescently determining flaws, imperfections or surface defects of a metal surface or metal coating.

SEE OR SEARCH CLASS

73, Measuring and Testing,

104+, for surface roughness testing.