The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 08, 2003
Filed:
Feb. 05, 2001
Antoni Murcia, San Diego, CA (US);
Ted T. Lee, San Diego, CA (US);
Juan Carlos Vives, San Diego, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A security document includes a secure message which is obscured by a frangible layer of opaque material. The frangible layer of opaque material may be removed using light abrasion. The security document is printed on an especially prepared print media, which may include a substrate of paper, light card stock, or plastic film, for example. The printing method may be carried out using a common inkjet printer, or a printer of another type may be used to print such a security document. Methods of performing the printing operation are explained, and especially configured printing apparatus for practicing the method is also disclosed. A covert printed security document, and method of making such a document is presented.