(under subclass 40) Subject matter comprising a step or means for detecting the presence of, or measuring the quantity or quality of invisible radiant energy rays, such as for example radioactive emanations or phosphorescence or fluorescence.
SEE OR SEARCH CLASS
250, Radiant Energy,
254, for methods and apparatus with a nominal drill apparatus or drilling step combined with a geological invisible radiation test, or earth formation or well material irradiation method or apparatus, and subclasses 256+ for methods and apparatus to detect or utilize invisible radiation to test material in or about a well.
340, Communications: Electrical,
600, for electrical automatic radiant energy responsive indicating systems.
