US PATENT SUBCLASS 134 / 22.1
.~ Hollow work, internal surface treatment

Current as of: June, 1999
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134 /   HD   CLEANING AND LIQUID CONTACT WITH SOLIDS

*  DD  PROCESSES {23}
22.1.~ Hollow work, internal surface treatment {7}
22.11  DF  .~.~> Pipe, tubing, hose, or conduit {4}
22.16  DF  .~.~> With inorganic salt treating agent
22.17  DF  .~.~> With inorganic alkaline material treating agent
22.18  DF  .~.~> With pressurized fluid or fluid manipulation
22.19  DF  .~.~> With organic treating agent (e.g., solvent, surfactant, or reactant yielding soluble product, etc.)
23  DF  .~.~> Work or work parts movable during treatment
24  DF  .~.~> Movable fluid applying nozzle and/or with plugging or sealing of work passage or opening

DEFINITION

Classification: 134/22.1

Hollow work, internal surface treatment:

(under the class definition) Processes which include treating work such as bottles, tubes, or other work having cavities or other interior surfaces by application of the treating agent to the interior surfaces.

SEE OR SEARCH THIS CLASS, SUBCLASS:

8, for this subject matter involving in addition, the use of a solid work treating agent and see the notes thereunder.

14, for treating of work in coil form.

43, 53, 54+, 62, 152, and 166+, or other appropriate apparatus subclasses, for apparatus for treating the interior of hollow work.

SEE OR SEARCH CLASS

166, Wells, 311+, for methods of cleaning wells.