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:
Aug. 25, 2009
Filed:
Apr. 21, 2004
Denis Bohm, Los Altos, CA (US);
Michael G. Lamming, Palo Alto, CA (US);
Robert N. Mayo, Mountain View, CA (US);
Jeffrey A. Morgan, Cupertino, CA (US);
Kan Zhang, Palo Alto, CA (US);
Denis Bohm, Los Altos, CA (US);
Michael G. Lamming, Palo Alto, CA (US);
Robert N. Mayo, Mountain View, CA (US);
Jeffrey A. Morgan, Cupertino, CA (US);
Kan Zhang, Palo Alto, CA (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
Methods and systems for generating time-based identifiers that are used for identifying items is described. In one embodiment, a master key is assigned to an electronic tag. Time-based other keys are generated based on the master key. Time-based identifiers are generated based on the time-based other keys. The time-based identifiers are useful only for a period of time to a holder of the time-based other keys.