US PATENT SUBCLASS 175 / 24
AUTOMATIC CONTROL

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

24AUTOMATIC CONTROL {4}
25  DF  .~> Of fluid pressure below ground
26  DF  .~> Of boring means including a below-ground drive prime mover
27  DF  .~> Of advance or applied tool weight
38  DF  .~> In response to drilling fluid circulation

DEFINITION

Classification: 175/24

(under the class definition) Process or apparatus comprising the steps or means for (1) sensing a condition of operation which may or may not occur and (2) controlling a power operated means in response to said sensed condition (without assistance from an intelligent operator) to initiate, modify, or terminate the operation.

SEE OR SEARCH CLASS

173, Tool Driving or Impacting,

2+, for automatic control of a power operated tool driving or impacting means.

254, Implements or Apparatus for Applying Pushing or Pulling Force,

267, 268 and 272+ for a load hauling or hoisting drum with control means responsive to a condition. 299, Mining or In Situ Disintegration of Hard Material,

1, for subject matter relating to automatic control involved in recovering valuable earth material and disintegrating hard material in situ.

340, Communications: Electrical,

853.2+, for an electronic communication selective control system in a wellbore.