US PATENT SUBCLASS 428 / 199
.~.~ Including developable image or soluble portion in coating or impregnation (e.g., safety paper, etc.)

Current as of: June, 1999
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428 /   HD   STOCK MATERIAL OR MISCELLANEOUS ARTICLES

98  DF  STRUCTURALLY DEFINED WEB OR SHEET (E.G., OVERALL DIMENSION, ETC.) {20}
195  DF  .~ Discontinuous or differential coating, impregnation or bond (e.g., artwork, printing, retouched photograph, etc.) {9}
199.~.~ Including developable image or soluble portion in coating or impregnation (e.g., safety paper, etc.)

DEFINITION

Classification: 428/199

(under subclass 195) Product in which the discontinuous or differential coating or impregnation comprises (1) normally nonvisible indicia or (2) portions which are dissolvable and, in both (1) and (2) above, when treated in other than normal use, would become visible.

(1) Note. This is the locus for so-called safety or bank paper, which, when an erasure or eradication is attempted, clearly indicates such attempt.

SEE OR SEARCH THIS CLASS, SUBCLASS:

29, for an article having a latent image which is visible or barely visible and must be treated to become more visible on intended use.

915, and 916, for cross reference art collections of documents which are treated to indicate alterations or erasures or other fraud attempts.