(under the class definition) Process or apparatus comprising a step or means for continuously recirculating within the bore a plurality of unsupported elements such as shot or pellets to cause such elements to directly impinge upon and disintegrate the formation.
(1) Note. The elements must be recirculated entirely within the bore for classification in this subclass. Drilling fluid provided with unsupported particles which circulate from above ground into the bore is excluded.
(2) Note. The elements (e.g., shot or pellets) need not be claimed for classification in this subclass.
SEE OR SEARCH THIS CLASS, SUBCLASS:
380, for cutters comprising unsupported abrading particles (e.g., shot) where there is no means to recirculate the particles.
SEE OR SEARCH CLASS 15, Brushing, Scrubbing, and General Cleaning,
95+, for cleaning by shotting.
451, Abrading,
2+, for a condition responsive control for sandblasting and subclasses 75+ for a sandblasting machine.
