Security document with functional watermark and methods for making same
AssigneeCrane Co.
InventorsMichael Darroch, Paul Mirto, Jeffrey Scot Royal, Giles D. Prett, Steven Lukaszek
Life of this patent
Estimating the term…
Abstract
A security document includes a fibrous substrate, the fibrous substrate including a functional watermark including a defined region of altered fiber density relative to a bulk portion of the fibrous substrate, wherein the functional watermark comprises a first edge defining, at least in part, a shape of the defined region of altered fiber density. The security document further includes a surface applied security device covering at least part of the defined region of altered fiber density relative to the bulk portion.
Claims20
A security document, the security document comprising:
- a fibrous substrate, the fibrous substrate including:
- a functional watermark including a defined region of altered fiber density relative to a bulk portion of the fibrous substrate, wherein the functional watermark comprises a first edge defining, at least in part, a shape of the defined region of altered fiber density;
- and
- a surface applied security device covering at least part of the defined region of altered fiber density relative to the bulk portion.
A method of making a security document, the method comprising:
- forming an initial fibrous web from a wet fibrous slurry;
- altering a fiber density of the initial fibrous web in one or more defined regions to define one or more functional watermarks;
- pressing and drying the initial fibrous web to form a fibrous substrate comprising a bulk portion and the one or more functional watermarks, wherein the one or more functional watermarks comprise at least one of a light element or a dark element, the light element or dark element having at least one edge bounding a region of altered fiber density;
- and
- applying a surface applied security device covering at least part of the one or more functional watermarks.
Dependencies are inferred from the claim text.