US PATENT SUBCLASS 436 / 3
.~ Leak detection


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}
3.~ Leak detection


DEFINITION

Classification: 436/3

Leak detection:

(under subclass 2) Processes or compositions for a test in which a chemical reaction is included in a process for detection of leaks.

(1) Note. Included in this subclass are processes for determining leaks in a closed system, or, equipment failure wherein the material leaking out of the closed system, or a tracer leaking from the closed system, is determined by a chemical reaction, e.g., reaction with a colorimetric indicator. Examples of closed systems are refrigeration systems, heat exchangers, tanks, etc.

SEE OR SEARCH CLASS

73, Measuring and Testing,

40+, for physical tests of leakage; 598 and 600 for flaw or discontinuity detection by use of a vibration.

252, Compositions,

62.52, for a magnetic flaw detection composition.

374, Thermal Measuring and Testing, for thermal measuring and testing.