Xinyu Zang

7982585, Jul 19, 2011

Feb 28, 2007

11/712641

Li-Cheng Richard Zai - Los Gatos CA, US
Xinyu Harry Zang - Sunnyvale CA, US

H04Q 5/22
G06K 7/10

340 101, 340 102, 340 103, 340 104, 23546246

A method and an apparatus for evaluating an expression embedded inside a communication packet received from an RFID (Radio Frequency Identification) interrogator device are described. The evaluation result may determine a selection with another RFID interrogator device. An RFID data packet may be sent to an RFID interrogator device based on a selection to be associated with the RFID interrogator. A task may be performed based on the evaluation as instructed by a remote RFID interrogator through a command included in the wireless communication packet.

20050061875, Mar 24, 2005

Sep 9, 2004

10/937580

Li-Cheng Zai - Los Gatos CA, US
Xinyu Zang - Sunnyvale CA, US

G06K015/00

235383000

The method and apparatus for a secure RFID system provide a secure environment that the passwords are not known by a large number of operators and a reader ceases to operate if it is taken away from its authorized operator. The secure RFID system consists of tags, readers, authentication cards, and digital signature cards. The passwords are stored in the authentication cards and cannot be read by typical operators. The reader ceases to operate if the ticket in the authentication card expires or it is separated from the paired wireless authentication card. The authenticity of the tag data is ensured by using the signature card.

20050088284, Apr 28, 2005

Oct 8, 2004

10/962073

Li-Cheng Zai - Los Gatos CA, US
Xinyu Zang - Sunnyvale CA, US

H04Q005/22

340010200

The present invention relates to a method and apparatus for using a RFID reader network to provide a large operating area, thereby enabling multiple RFID readers to simultaneously operate with minimal interference among all the RFID readers in the same network. The RFID network comprises a plurality of RFID readers connected to a server via a network backbone. Each operating RFID reader is associated with a group of neighboring RFID readers. A neighboring RFID reader is defined as a RFID reader that can detect tag responses for the communication between the operating RFID reader and its RFID tags. Each operating RFID reader sends its neighboring RFID readers at least one Tag Operation (TO) packet before starting to communicate with RFID tags and at least one End of Tag Operation (ETO) packet after the tag operation is completed. To avoid interference, each RFID reader uses a listen-before-talk scheme in which it checks if any TO packet has been sent by neighboring RFID readers before starting radio transmission. If both RFID readers are allowed to transmit, the RFID reader with a neighboring RFID reader just finishing transmission has the higher priority. This approach improves the throughput by taking advantage of the overlapped areas of neighboring RFID readers.

20050093679, May 5, 2005

Oct 29, 2004

10/978125

Li-Cheng Zai - Los Gatos CA, US
Xinyu Zang - Sunnyvale CA, US

H04Q005/22

340010200

The system of the present invention includes a large-zone RFID reader, a plurality of small-zone RFID readers, and a plurality of RFID tags. The large-zone RFID reader covers areas which are not covered by the small-zone RFID readers. The output power of the small-zone RFID readers is controlled by the large-zone RFID reader based on RFID tag operation patterns of the small-zone RFID readers. The system reliability is improved by a method that uses reliable RFID tags, RFID reader beacon signals, and RFID tag's repetitive transmitting signals to detect tag failures. The system security is provided by a method that uses integrated crypto engines in both the RFID tags and RFID readers.

20080284566, Nov 20, 2008

Jun 25, 2007

11/823064

Li-Cheng Richard Zai - Los Gatos CA, US
Xinyu Harry Zang - Sunnyvale CA, US
Sophia Fang-Jung Liu - Cupertino CA, US

H04Q 1/00

340 756

A method and an apparatus for determining the proximity between an electronic sign and one or more object items to transmit presentation information to the electronic sign are described. The determination may be based on a signal wirelessly generated from the electronic sign. The presentation information displayed at the electronic sign may describe the one or more object items. Locations of the one or more object items may be determined based on wirelessly received identifiers of the one or more objects items, a portable wireless device, and the electronic sign.

20090153348, Jun 18, 2009

Jan 11, 2008

12/008528

Li-Cheng Richard Zai - Los Gatos CA, US
Xinyu Zang - Sunnyvale CA, US
Sophia Fang-Jung Liu - Cupertino CA, US

G09F 13/00
G08B 21/18

3406866, 34081553, 3405391, 340 51

A method and apparatus that select presentation information for an electronic sign wirelessly placed within a proximity of one or more object items are described herein. The electronic sign displays the presentation information. An alert message is determined in response to a signal received from the electronic sign according to objects items in proximity locations of the electronic sign. The determined alert message is sent to the electronic sign to replace the displayed presentation information.

20090281888, Nov 12, 2009

Jul 25, 2008

12/180494

Li-Cheng Richard Zai - Los Gatos CA, US
Xinyu Zang - Palo Alto CA, US
Sophia Fang-Jung Liu - Cupertino CA, US
Mao-Jung Chen - Taipei City, TW

G06F 3/048
G06Q 30/00
G06Q 50/00

705 1425, 715764, 705 1437

A method and apparatus that determine a time window based on a presentation schedule for a multimedia content in response to receiving the presentation schedule is described herein. The multimedia content is played according to the presentation schedule at a predetermined location. During the time window, an interactive user interface pattern is presented within a vicinity of the predetermined location. In response to receiving a user input via the interactive user interface pattern, a reward is generated during the time window.