US PATENT SUBCLASS 436 / 33
.~.~.~.~ Evolving gas by acidification

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

25  DF  GEOCHEMICAL, GEOLOGICAL, OR GEOTHERMAL EXPLORATION {4}
29  DF  .~ For petroleum oils or carbonaceous minerals {2}
31  DF  .~.~ Removing and testing solid samples {1}
32  DF  .~.~.~ Analyzing evolved gas {1}
33.~.~.~.~ Evolving gas by acidification

DEFINITION

Classification: 436/33

Evolving gas by acidification:

Processes or compositions under subclasses 32 where the gas is evolved by treating or contacting the solid sample with an acid.

(1) Note. Typically the processes included in this subclass involve a step of treating the solid sample with a mineral acid, e.g., H2SO4[end subscrpt], etc., to evolve gas.