US PATENT SUBCLASS 264 / 566
.~.~.~.~ With application of external pressure or 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.~.~.~.~ With application of external pressure or vacuum {3}
567  DF  .~.~.~.~.~> With reheating of work (e.g., tempering, annealing, etc.)
568  DF  .~.~.~.~.~> Including use of vacuum
569  DF  .~.~.~.~.~> Including annular fluid contact

DEFINITION

Classification: 264/566

With application of external pressure or vacuum:

(under subclass 564) Processes in which the tubular product is shaped by the application of a positive or negative differential pressure to its exterior surface.

(1) Note. This subclass includes application of positive physical pressure by means of a mechanical device in contact with the work.