US PATENT SUBCLASS 264 / 547
.~.~ With distinct staged deformation by differential 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}
544  DF  .~ Starting material is nonhollow planar finite length preform or product is finite length {6}
547.~.~ With distinct staged deformation by differential fluid pressure {2}
548  DF  .~.~.~> Including heating after forcing into contact with a solid heating means by differential fluid pressure
549  DF  .~.~.~> Including use of male part to stretch heated preform which is formed by a female mold which determines shape of work

DEFINITION

Classification: 264/547

With distinct staged deformation by differential fluid pressure:

(under subclass 544) Processes in which the differential fluid pressure is applied in sequential noncontinuous increments.

(1) Note. This subclass includes processes in which a sheet is forced in one direction and then the opposite direction by application of differential fluid pressure.

(2) Note. A step of curing or vulcanization is not for purposes of this subclass a shaping step.