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:
Mar. 10, 2009
Filed:
May. 21, 2004
John G. Ferrante, Wilmington, DE (US);
John G. Ferrante, Wilmington, DE (US);
Lockheed Martin Corporation, Bethesda, MD (US);
Abstract
An RFID tag includes taggents which reflect at selected frequencies or tones. For each byte of information to be associated with an item to be tagged, a reflective tone range is assigned. Within the tone range of each byte, a bit is represented by a subband range, where a reflective tone in any subband range represents a logic 1 state of that bit. To represent a bit, one of the reflective tones in the subband is randomly chosen. The data carried by the tag may include checksum information carried in further tone range. The randomly assigned subband selected for each item(s) is recorded, and the recorded information accompanies a group of tagged items. Reading tagged items involves tone scanning the tags and using the resulting reflective tones and the recorded information to determine which items are present.