(under subclass 43) Processes wherein the operation of the self-operated analyzer is controlled responsive to a sensed operating parameter or time sequence.
(1) Note. Control of industrial processes with feedback or feed-forward control of fluids to or from the process controlled do not belong in this class. They are classified with the appropriate synthesis class providing for the process.
SEE OR SEARCH CLASS
175, Boring or Penetrating the Earth,
59, for process 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 subclass
310 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.
