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US 2006/0078673 A1Published application
Method for printing using invisible inks
OwnerJacqueline Ripsteininventor
Life of this patent
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Abstract
The present invention is directed to a method of offset lithographic printing text and images using invisible inks in order to provide differing visual characteristics when the text or image is observed under varying light conditions. That is, one image may be observed under normal, e.g., ambient, incandescent and fluorescent light conditions whereas another image may be observed only when the whole image is subjected to ultra-violet light such as a “black light.”
Claims7
A method of providing invisible text or images on an object comprising the steps of:
- a) providing an object to be printed upon;
- b) applying to at least a portion of said object a pigment not visible under a first set of conditions of use of said object;
- wherein said pigment is capable of becoming visible under a second set of conditions of use of said object.
A method of providing invisible text or images on a web site comprising the steps of:
- a) providing a web site having a hidden portion not visible to a user upon said user's initial access of said web site;
- and
- b) revealing said hidden portion to said user when said user positions a mouse cursor over said hidden portion.
Dependencies are inferred from the claim text.