US PATENT SUBCLASS 264 / 568
.~.~.~.~.~ Including use of vacuum


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}
555  DF  .~ Production of continuous or running length {3}
563  DF  .~.~ Producing a tubular product {1}
564  DF  .~.~.~ Including deformation by application of fluid pressure {2}
566  DF  .~.~.~.~ With application of external pressure or vacuum {3}
568.~.~.~.~.~ Including use of vacuum


DEFINITION

Classification: 264/568

Including use of vacuum:

(under subclass 566) Processes in which the work is subjected to a pressure less than atmospheric.

(1) Note. Vacuum as used in this subclass does not include blowing air across the surface of a tubular product and thus producing a negative pressure by a venturi effect.