US PATENT SUBCLASS 242 / 331.1
.~.~ Vacuum column

Current as of: June, 1999
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242 /   HD   WINDING, TENSIONING, OR GUIDING

324  DF  UNWINDING AND REWINDING A MACHINE CONVERTIBLE INFORMATION CARRIER (E.G., MAGNETIC TAPE OR PHOTOGRAPHIC FILM) {13}
331  DF  .~ Intermediate storage (e.g., low inertia bin) {2}
331.1.~.~ Vacuum column {1}
331.2  DF  .~.~.~> Carrier responsive control {2}

DEFINITION

Classification: 242/331.1

Vacuum column:

(under subclass 331) Subject matter comprising means to create a negative pressure in a portion of the buffer zone to draw a length of material toward the zone.