1
Claude A Sharpe, Dwaine S Hurta, Mark A Hamlett: Multi-stage transponder wake-up, method and structure. Texas Instruments Incorporated, Rebecca A Mapstone, James C Kesterson, Richard L Donaldson, April 15, 1997: US05621412 (375 worldwide citation)

A system and method which conserves energy in the operation of a transponder or tag (14) by providing that the transponder (14) be enabled or awakened in multiple stages. A threshold detector (62) is provided which measures the power level of received RF energy. If the RF energy received by the dete ...


2
Ulrich Kaiser: Method and apparatus for wireless chemical supplying. Texas Instruments Incorporated, Rebecca A Mapstone, James C Kesterson, Richard L Donaldson, October 29, 1996: US05569187 (267 worldwide citation)

A method and apparatus for wireless supplying of chemicals is provided in which an interrogation unit (14) transmits interrogation signals. A responder unit (16), powered from the interrogation signals, is operable to receive the interrogation signals and transmit responses. The responder unit (16) ...


3
Kurt Orthmann, Andreas Hagl: Apparatus and method for identifying multiple transponders. Texas Instruments Incorporated, Rebecca A Mapstone, James C Kesterson, Richard L Donaldson, February 11, 1997: US05602538 (160 worldwide citation)

Apparatus and method of identifying a plurality of transponders (10-16) entering into an inquiry field (18) of an interrogation unit (20) are provided. The transponders (10-16) are each assigned a unique identification code. Upon receipt of an interrogation pulse from the interrogation unit (20), ea ...


4
Dwaine S Hurta, Anne Tip, Peter Wolfart: Speedup for monetary transactions using a transponder in conjunction with a smartcard. Texas Instruments Incorporated, Rebecca A Mapstone, James C Kesterson, Richard L Donaldson, February 11, 1997: US05602919 (143 worldwide citation)

This invention allows a user to have a smartcard (66) and a smartcard-based transponder (14). This smartcard-based transponder (14) can accept money from the smartcard (14). The amount transferred from the smartcard (66) can be stored in the transponder memory (80,82). At a toll plaza (29), a toll a ...


5
Claude Andrew Sharpe: Automatic vehicle identification system capable of vehicle lane discrimination. Texas Instruments Incorporated, Rebecca A Mapstone, James C Kesterson, Richard L Donaldson, December 23, 1997: US05701127 (140 worldwide citation)

A method of identifying an object and determining in which of at least two areas the object is located is disclosed. The method includes the steps of: focusing a first directional antenna (18) on a first area (28a), focusing a second directional antenna on a second area (28b), transmitting a first f ...


6
Loek d Hont: Highly accurate RF-ID positioning system. Texas Instruments Incorporated, Rebecca A Mapstone, James C Kesterson, Richard L Donaldson, January 14, 1997: US05594448 (131 worldwide citation)

A balanced receive antenna circuit configuration determines an accurate position of a transponder within the antenna field pattern of the reader antenna. The balanced receive antenna configuration consists of two antennas physically rotated 90 degrees relative to one another, disposed concentrically ...


7
Dwaine S Hurta, Francis B Frazee: Transponder maintenance mode method. Texas Instruments Incorporated, Rebecca A Mapstone, James C Kesterson, Richard L Donaldson, November 11, 1997: US05686920 (117 worldwide citation)

A method and system is provided for communicating permanent or semi-permanent information to a transponder (14) from an interrogator (12), preferably operated by a toll agency or other authorized entity. This permanent or semi-permanent information is communicated by means of special instructions va ...


8
Claude Andrew Sharpe: Automatic vehicle identification system capable of vehicle lane discrimination. Texas Instruments Incorporated, Rebecca A Mapstone, Richard A Donaldson, Jay M Cantor, October 7, 1997: US05675342 (108 worldwide citation)

A method of identifying an object and determining in which of at least two areas the object is located is disclosed. The method includes the steps of: focusing a first directional antenna (18) on a first area (28a), focusing a second directional antenna on a second area (28b), transmitting a first f ...


9
Loek d Hont: Highly accurate RE-ID positioning system. Texas Instruments Incorporated, Rebecca A Mapstone, James C Kesterson, Richard L Donaldson, April 8, 1997: US05619207 (107 worldwide citation)

A balanced receive antenna circuit configuration determines an accurate position of a transponder within the antenna field pattern of the reader antenna. The balanced receive antenna configuration consists of two antennas physically rotated 90 degrees relative to one another, disposed concentrically ...


10
Andreas Hagl, Horst Mollik, Kostantin Aslanidis: Positioning with RF-ID transponders. Texas Instruments Incorporated, Rebecca A Mapstone, James C Kesterson, Richard L Donaldson, April 15, 1997: US05621411 (105 worldwide citation)

A method of determining the exact location of a transponder with respect to a reader antenna, with no additional components to the existing system required, is disclosed. An existing pin of the reader IC, the RSTP pin, provides an analog fieldstrength signal from which the distance to the reader ant ...