US PATENT SUBCLASS 162 / 110
.~.~ Watermarking


Current as of: June, 1999
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162 /   HD   PAPER MAKING AND FIBER LIBERATION

100  DF  PROCESSES AND PRODUCTS {31}
109  DF  .~ Non-uniform, irregular or configured web or sheet {6}
110.~.~ Watermarking


DEFINITION

Classification: 162/110

(under subclass 109) Processes including a step or redistributing the fibers in the web or sheet or altering their configuration in a limited area of the web or sheet so as to produce a mark or design in the product which is visible when viewed by transmitted light, and the products of such processes.

(1) Note. The watermark is most frequently produced by a raised or depressed pattern on a dandy roll. In the former case, there is less fiber at the mark than in the balance of the sheet; in the latter case, there is more fiber. In either case, there is a difference in transparency between the area of the mark in the one hand and the balance of the sheet on the other.