Source: http://www.google.cl/patents/USRE43445?ie=ISO-8859-1
Timestamp: 2015-03-01 04:24:43
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Matched Legal Cases: ['Application No. 05016513', 'Application No. 05016514', 'art 3', 'art 3', 'art 1', 'art 2', 'art 3', 'art 4', 'art 1', 'art 2', 'art 3', 'art 3', 'art 3', 'art 3', 'art 1', 'art 2', 'art 3', 'art 4', 'art 1', 'art 2', 'art 3', 'art 3']

Patent USRE43445 - Method and apparatus to manage RFID tags - Google PatentsSearch Images Maps Play YouTube Gmail Drive Calendar More »Sign inAdvanced Patent SearchPatentsA method of establishing wireless communications between an interrogator and individual ones of multiple wireless identification devices, the method comprising utilizing a tree search method to establish communications without collision between the interrogator and individual ones of the multiple wireless...http://www.google.cl/patents/USRE43445?utm_source=gb-gplus-sharePatent USRE43445 - Method and apparatus to manage RFID tagsAdvanced Patent SearchPublication numberUSRE43445 E1Publication typeGrantApplication numberUS 11/865,584Publication date5 Jun 2012Filing date1 Oct 2007Priority date19 Feb 1998Also published asUS6072801, US6226300, US6307848, US20010043569, USRE42344, USRE43020, USRE44411Publication number11865584, 865584, US RE43445 E1, US RE43445E1, US-E1-RE43445, USRE43445 E1, USRE43445E1InventorsClifton W. Wood, Jr., Don HushOriginal AssigneeRound Rock Research, LlcExport CitationBiBTeX, EndNote, RefManPatent Citations (103), Non-Patent Citations (108), Referenced by (1), Classifications (20), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetMethod and apparatus to manage RFID tags
US RE43445 E1Abstract
A method of establishing wireless communications between an interrogator and individual ones of multiple wireless identification devices, the method comprising utilizing a tree search method to establish communications without collision between the interrogator and individual ones of the multiple wireless identification devices, a search tree being defined for the tree search method, the tree having multiple levels representing subgroups of the multiple wireless identification devices, the number of devices in a subgroup in one level being half of the number of devices in the next higher level, the tree search method employing level skipping wherein at least one level of the tree is skipped. A communications system comprising an interrogator, and a plurality of wireless identification devices configured to communicate with the interrogator in a wireless fashion, the respective wireless identification devices having a unique identification number, the interrogator being configured to employ a tree search technique to determine the unique identification numbers of the different wireless identification devices so as to be able to establish communications between the interrogator and individual ones of the multiple wireless identification devices without collision by multiple wireless identification devices attempting to respond to the interrogator at the same time, wherein levels of the tree are occasionally skipped. In one aspect, a method includes: transmitting by an interrogator a first wireless signal, specifying a first set of bit values, to request first replies from radio frequency identification (RFID) devices that have the first set of bit values; and responsive to a collision in the first replies, transmitting by the interrogator a second wireless signal, specifying a second set of bit values having at least two more bits than the first set, to request second replies from RFID devices that have the second set of bit values.
ThisMore than one reissue application has been filed for the reissue of U.S. Pat. No. 6,307,848. The reissue applications are the initial reissue application Ser. No. 10/693,697 filed Oct. 23, 2003, a continuation reissue application Ser. No. 11/865,580 filed Oct. 1, 2007, and the present application, which is a Continuationcontinuation application of reissue application Ser. No. 10/693,697, filed Oct. 23, 2003, which is a reissue application of U.S. patent application Ser. No. 09/773,461, filed Jan. 31, 2001 and now U.S. Pat. No. 6,307,848, which is a continuation application of U.S. patent application Ser. No. 09/551,304, filed Apr. 18, 2000, and titled �Method of Addressing Messages, and Establishing Communications Using a Tree Search Technique That Skips Levels� and now U.S. Pat. No. 6,226,300, which in turn is a continuation of U.S. patent application Ser. No. 09/026,045, filed Feb. 19, 1998, which is now U.S. Pat. No. 6,072,801.
An electronic identification system which can be used as a radio frequency identification device, arbitration schemes, and various applications for such devices are described in detail in commonly assigned U.S. patent application Ser. No. 08/705,043, filed Aug. 29, 1996, and now U.S. Pat. No. 6,130,602 which is, incorporated herein by reference.
FIG. 2 shows but one embodiment in the form of a card or badge 19 including the radio frequency data communication device 12, and a housing 11 including of plastic or other suitable material supporting the device 12 and the power supply 18. In one embodiment, the front face of the badge has visual identification features such as graphics, text, information found on identification or credit cards, etc.
Aloha methods are described in a commonly assigned patent application (attorney docket number MI40-089) naming Clifton W. Wood, Jr. as an inventor, titled �Method of Addressing Messages and Communications System,� filed concurrently herewith, and Ser. No. 09/026,248, filed Feb. 19, 1998, now U.S. Pat. No. 6,275,476, which is incorporated herein by reference.
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