US PATENT SUBCLASS 73 / 152.44
.~.~ Drill depth rate

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

152.01  DF  BOREHOLE OR DRILLING (E.G., DRILL LOADING FACTOR, DRILLING RATE, RATE OF FLUID FLOW) {6}
152.43  DF  .~ During drilling {3}
152.44.~.~ Drill depth rate {1}
152.45  DF  .~.~.~> Electronic processing or electronic recording

DEFINITION

Classification: 73/152.44

Drill depth rate:

(under subclass 152.43) Subject matter wherein the drill rigging includes a drill and the determination of the physical characteristic of the borehole, the casing, or the drill rigging is made by either (a) measuring the rate at which the drill cuts through the formation, or (b) periodically measuring the depth of the drill which is utilized to compute the rate at which the drill cuts through the formation.

(1) Note. The identity of the formation can be readily ascertained from the relative ease with which the drill penetrates the formation.

(2) Note. The measurement of the drill depth rate is usually recorded by automatic means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

152.03, for formation logging while drilling.

SEE OR SEARCH CLASS

33, Geometrical Instruments, 700+, for distance measuring. Note particularly indented subclasses 713+ for sounding-type measuring devices.

175, Boring or Penetrating the Earth,

39, for measuring bit wear and subclass 50 for indicating testing or measuring a condition of a formation in the earth's surface while drilling when more than a mere step in boring is recited or drill structure is recited.

346, Recorders, appropriate subclasses for a recorder for recording the operation of machines and in particular

33+, for a recorder combined with external recorder operating means including a well logging device and subclasses 112+ for a graph-type recorder.

368, Horology: Time Measuring Systems or Devices,

89+, for time interval measuring, per se.