Document and method of making document including invisible...

Details Document and method of making document including invisible... Document and method of making document including invisible...

2011-04-05

2011-04-05

Baldwin, Gordon R (Department: 1784)

Stock material or miscellaneous articles

Article having latent image or transformation

C283S091000

Reexamination Certificate

active

07919155

ABSTRACT:
A document includes paper having an average surface roughness of at least about 0.5 microns and including one or more optical brighteners, and includes at least one image thereon wherein the at least one image includes clear binder and light absorbing material that absorbs light only at wavelengths below 350 nm. The image is substantially not detectable to a naked human eye through differential gloss or exposure to light having wavelengths of 365 nm or more, but may be revealed to the naked human eye by exposing the document to light having a wavelength at which the light absorbing material absorbs light.

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Office Action dated Dec. 14, 2010 in pending U.S. Appl. No. 12/029,065.
Wikipedia, “Invisible Ink”, Sep. 13, 2006, 3 pages.
European Office Action mailed Dec. 16, 2010 in related European Patent Application No. 08151734.4.

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