US PATENT SUBCLASS 436 / 25
GEOCHEMICAL, GEOLOGICAL, OR GEOTHERMAL EXPLORATION

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

25GEOCHEMICAL, GEOLOGICAL, OR GEOTHERMAL EXPLORATION {4}
26  DF  .~> For metallic ores
27  DF  .~> Using chemical tracers
28  DF  .~> In situ testing
29  DF  .~> For petroleum oils or carbonaceous minerals {2}

DEFINITION

Classification: 436/25

GEOCHEMICAL, GEOLOGICAL, OR GEOTHERMAL EXPLORATION:

(under the class definition) Processes or compositions utilizing chemical analysis for studying or determining the existence, location of flow of materials or studying other natural phenomena on, within or below the earth's crust, or determining components of solids or ores.

(1) Note. Most determinations are indirect for example determining metal carbonates, HCO3, Ca[supscrpt]+[end supscrpt], C1[supscrpt]-[end supscrpt], Mg[supscrpt]+[end supscrpt], as indication of deposits and will be classified according to purpose of the claim.

(2) Note. The headnotes of Class 166, Wells, provide a comprehensive listing of well related testing art.

SEE OR SEARCH CLASS

73, Measuring and Testing,

152.01+, for borehole testing, per se, wherein the test is not of a purely electrical type or of a purely magnetic type.

166, Wells,

264, 265+, 268, 336+, and 350+ for processes which may involve a chemical test when combined with more than a nominal step of well drilling treating or recovering a fluid therefrom. A process claiming the use of an injection and a separate recovery well is considered to be more than a nominal well treating step.

324, Electricity: Measuring and Testing,

323, for process of geophysical testing or investigation using electrical properties.

435, Chemistry: Molecular Biology and Microbiology,

9, for a process of testing for a mineral, oil, etc., by means of a microorganism or enzyme.

516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting, appropriate subclasses for subject matter relating to: colloid systems (such as sols*, emulsions, dispersions, foams, aerosols, smokes, gels, or pastes) or wetting agents (such as leveling, penetrating, or spreading); subcombination compositions of colloid systems containing at least an agent specialized and designed for or peculiar to use in making or stabilizing colloid systems; compositions and subcombination compositions specialized and designed for or peculiar to use in breaking (resolving) or inhibiting colloid systems; processes of making the compositions or systems of the class; processes of breaking (resolving) or inhibiting colloid systems; in each instance, when generically claimed or there is no art class. Class 516 provides for compositions otherwise seemingly proper for Class 436 when the compositions are colloid systems or wetting agents.