US PATENT SUBCLASS 73 / 290 R
LIQUID LEVEL OR DEPTH GAUGE

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

290 RLIQUID LEVEL OR DEPTH GAUGE {13}
291  DF  .~> With other measuring device {1}
293  DF  .~> With illumination
294  DF  .~> With funnel or hose nozzle
295  DF  .~> Thermal type
296  DF  .~> Weighing type
297  DF  .~> Test cock type
298  DF  .~> Exploring tube
299  DF  .~> Hydrostatic pressure type {3}
304 R  DF  .~> Immersible electrode type {1}
305  DF  .~> Float {12}
323  DF  .~> Sight glass {5}
290 B  DF  .~> Ullage volume
290 V  DF  .~> Vibratory type

Unofficial Alpha Subclasses: R B V

DEFINITION

Classification: 73/290

(under the class definition) Gauges for determining the level or depth of bodies of liquid and not otherwise classifiable. The gauges may be properly calibrated for use with certain containers so as to indicate volume as a function of liquid level. The volume indicated in such instances may be the quantity of liquid remaining in the container or the quantity removed therefrom. Devices for gauging the draft of ships are here included.

(1) Note. Devices for determining depths, by sonic or electrical wave means are found in Classes 324, Electricity: Measuring and Testing, subclasses 323+; Class 181, Acoustics, subclass 124 and Class 367, Communications, Electrical: Acoustic Wave Systems and Devices, subclasses 87+.

(2) Note. For nonquantitative liquid level alarms or indicators, see Class 116, Signals and Indicators, subclasses 109+ and subclasses 227+ where nonelectrical and Class 340, Communications: electrical subclasses 618+ where electrical.

(3) Note. Although the patents classified in this and indented subclasses are principally for devices for determining the depth or level of bodies of liquid, devices which are similar in construction or operation to such devices have been classified herein even though disclosed solely for determining the level of dry fluent materials.

SEE OR SEARCH CLASS

15, Brushing, Scrubbing, and General Cleaning,

257.073, for a supply container for loading the tool of an applicator, which container is provided with means for contacting the applicator for indicating or limiting the extent of penetration of the tool into the supply and including means which is adjustable to correspond to the drop in level of the supply. 33, Geometrical Instruments,

713+, for sounding devices for determining the depth of bodies of fluent material or for measuring the distance from a datum to the surface of fluent material wherein only a

measurement of distance is involved.

116, Signals and Indicators, see Note 2.

137, Fluid Handling,

386+, for fluid handling apparatus including means for controlling flow in response to or to maintain liquid level.

164, Metal Founding,

151.3, for a metal casting apparatus including a melt level sensor.

181, Acoustics, see Note 1.

324, Electricity: Measuring and Testing, see (1) Note above.

340, Communications: Electrical, see (1) Note and (2) Note above.