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:
Jun. 08, 2010
Filed:
Jan. 14, 2005
Robert Francis Squibbs, Bristol, GB;
James Thomas Edward Mcdonnell, Bristol, GB;
Robert Francis Squibbs, Bristol, GB;
James Thomas Edward McDonnell, Bristol, GB;
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A physical object includes a base medium, such as a paper sheet, and a memory tag embedded in it or attached to it. The memory tag stores at least one measure/location data pair including a measurement of a location-dependent characteristic of the base medium originally associated with the tag, and a location in or on the object where the measurement was made. Preferably the measure/location data pair is digitally signed and stored in encrypted form. By checking whether the measure included in the stored data pair matches a current measure of the base medium at the indicated location, it is possible to check whether the base medium is the original medium. Apparatus is provided for originally writing the data pair to the memory tag; apparatus is also provided for subsequendy using the data pair for carrying out the checking operation.