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US 7,682,687 B2Granted
Forgery-preventing film
AssigneeYupo Corporation
InventorsKatsukuni Nitta, Kazuyo Senga
Life of this patent
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Abstract
Disclosed is a forgery-preventing film having a structure in which a thermoplastic resin film is attached to both faces of a light-shielding layer processed for forgery prevention. It is impossible to recognize the letter information to be protected in the forgery-preventing film without peeling the information-concealing layer therefrom.
Claims24
A forgery-preventing film having a structure in which a thermoplastic resin film is attached to both faces of a light-shielding layer processed for forgery prevention;
- wherein the light-shielding layer has shading;
- wherein the shading is invisible by reflected light but visible by transmitting light;
- wherein the total light transmittance through the light part of the shaded area is from 5 to 12 percent;
- and
- wherein the light part of the forgery-preventing area has a dot ratio of from 5 to 70 percent.
2 more elements
Dependencies are inferred from the claim text.