US PATENT SUBCLASS 270 / 52.28
.~.~.~.~ By suction

Current as of: June, 1999
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270 /   HD   SHEET-MATERIAL ASSOCIATING

52.01  DF  ASSOCIATING OR DISASSOCIATING {11}
52.14  DF  .~ Signature associating {7}
52.26  DF  .~.~ Saddle associating {3}
52.27  DF  .~.~.~ Saddle opener {1}
52.28.~.~.~.~ By suction

DEFINITION

Classification: 270/52.28

By suction:

(under subclass 52.27) Subject matter wherein the signature opener includes an element having a surface, through which surface a vacuum or subatmospheric pressure is applied to facilitate engaging and pulling one side of the signature toward the surface.

SEE OR SEARCH THIS CLASS, SUBCLASS:

52.24, for opening the signatures by suction means.