US PATENT SUBCLASS 264 / 553
.~.~ 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}
544  DF  .~ Starting material is nonhollow planar finite length preform or product is finite length {6}
553.~.~ Including use of vacuum {1}
554  DF  .~.~.~> Including use of male mold part which determines the final shape of at least a portion of the work

DEFINITION

Classification: 264/553

Including use of vacuum:

(under subclass 544) Processes in which the work is subjected to a pressure less than atmospheric.

SEE OR SEARCH THIS CLASS, SUBCLASS:

87, for processes of removing a liquid through a mold surface by vacuum.

101+, for processes of treating work by use of a vacuum which treatment does not support, shape, or sustain the work.