(under subclass 25) Processes or compositions wherein the testing is conducted within the earth's crust.
(1) Note. This subclass is limited to processes wherein the testing device is inserted into the earth's crust.
(2) Note. This subclass does not include inserting an absorbing medium into a bore hole and subsequently removing the absorbent and determining the amount of gas/carbonaceous products absorbed.
SEE OR SEARCH CLASS
73, Measuring and Testing,
152.07, 152.09, and 152.11 for core sample analysis for making a formation logging, subclasses 152.23+ for fluid flow measuring or fluid analysis combined with sampling well fluid wherein the test is not purely electrical or purely magnetic, and subclasses 863+ for methods and apparatus for sampling liquids not involving a well, or for soil gas sampling methods and apparatus.
175, Boring or Penetrating the Earth,
59, for processes of taking solid samples of earth formation combined with a step of retaining fluid therein, or taking a separate fluid sample. 250, Radiant Energy,
253+, for processes of geological testing, or irradiation
including the use of a radioactive tracer in a well and subclass 301 for a process of determination of oil presence contamination or concentration and subclasses 302+ for methods of using a tracer which emits radiant energy.
324, Electricity: Measuring and Testing,
323+, for subject matter relating to the determination of an electrical characteristic of the subsurface of the earth, and involving devices in wells.
507, Earth Boring, Well Treating, and Oil Field Chemistry,
100+, for compositions and mere methods of use of said compositions in earth boring and well treating processes. See Class 166, subclasses 305.1, for a more detailed discussion of placing fluid into an earth formation.
