US PATENT SUBCLASS 175 / 58
.~ Sampling of earth formations


Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

57  DF  PROCESSES {5}
58.~ Sampling of earth formations {2}
59  DF  .~.~> Retaining fluid or taking separate fluid sample
60  DF  .~.~> Transporting sample to surface by fluid


DEFINITION

Classification: 175/58

(under subclass 57) Processes comprising drilling a definite sample of earth from the borehole or from the surrounding earth formation for testing or measuring purposes.

(1) Note. The manner of taking the sample may be the taking of a core during drilling, collecting chips or cuttings

dislodged by drilling or removing a plug from the sidewall of previously formed borehole, but these steps must be set forth as earth sampling steps to be classified in this subclass.

(2) Note. Sampling apparatus as such is difficult, in some instances, to distinguish from similar nonsampling apparatus and thus apparatus has been classified not on the function of sampling but on its drilling or boring function in general. Only in those instances where the sampling feature is a distinguishing characteristic have the patents been so classified.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3, for processes or devices for severing a core by means of an explosive or explosion.

4, for processes or devices in which a core receiver is driven into a formation by an explosion. 20, for a process or apparatus for boring without earth removal, combined with a step or means for removing an earth sample.

44, for processes or apparatus providing identifiable indication of core position in situ for core sample orientation.

49, for process or apparatus having means or steps for observing a sample.

77, for apparatus in which a sample receptacles, generally of the side-wall type, is fed laterally without rotation from a carrier.

78, for sample taking tools which are motor fed laterally of a carrier, generally to take a side-wall sample.

308, for below ground receptacles for cuttings.

403, and the search there noted for core taking tools.