US PATENT SUBCLASS 264 / 504
.~ Perforation by differential fluid pressure; or smoothing, scoring, or cutting of green concrete with fluid pressure

Current as of: June, 1999
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264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

500  DF  DIRECT APPLICATION OF FLUID PRESSURE DIFFERENTIAL TO PERMANENTLY SHAPE, DISTORT, OR SUSTAIN WORK {14}
504.~ Perforation by differential fluid pressure; or smoothing, scoring, or cutting of green concrete with fluid pressure

DEFINITION

Classification: 264/504

Perforation by differential fluid pressure; or smoothing, scoring, or cutting of green concrete with fluid pressure:

(under subclass 500) Processes in which application of fluid pressure results in the formation of a hole or aperture in a workpiece or in which direct application of fluid pressure smooths or cuts a green concrete article.

(1) Note. Excluded herefrom are flash and sprue trimmings by fluid pressure differential and such is provided for in subclass 536.

SEE OR SEARCH THIS CLASS, SUBCLASS:

154, 155 and 156, for hole formation by means other than differential fluid pressure.