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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 (372 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
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 (141 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 ...


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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 ...


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Dwaine S Hurta, Francis B Frazee: Method and system for calculating a user account balance in a recognition system. Texas Instruments Incorporated, Rebecca Mapstone Lake, James C Kesterson, Richard L Donaldson, September 15, 1998: US05809142 (115 worldwide citation)

A system and method in which a transponder (14) is operable to transmit an original user account balance to an interrogator (12), which in turn calculates a revised user account balance and transmits the revised user account balance to the transponder (14). In one embodiment of the invention, the tr ...


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Dwaine S Hurta, Guenther Froschermeier: Transponder interface circuit. Texas Instruments, Texas Instruments Deutschland, Brian C McCormack, James C Kesterson, Richard L Donaldson, June 11, 1996: US05525994 (105 worldwide citation)

A transponder interface circuit (172) operates to allow communication between a transponder controller (104) and external circuitry. The interface circuit (172) has a buffer memory (184,186) that allows the transponder controller (104) and the external circuitry each to transmit data at either the t ...


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Dwaine S Hurta, Guenther Froschermeier: Transponder interface circuit. Texas Instruments Incorporated, Brian C McCormack, James C Kesterson, Richard L Donaldson, January 30, 1996: US05488376 (102 worldwide citation)

A transponder interface circuit (172) operates to allow communication between a transponder controller (104) and external circuitry. The interface circuit (172) has a buffer memory (184,186) that allows the transponder controller (104) and the external circuitry each to transmit data at either the t ...


8
Claude A Sharpe, Dwaine S Hurta, Mark A Hamlett, Guenther Froschermeier: Multi-stage transponder wake-up, method and structure. Texas Instruments Incorporated, Texas Instruments Deutschland, Brian C McCormack, James C Kesterson, Richard L Donaldson, November 28, 1995: US05471212 (76 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 ...


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Dwaine S Hurta, Francis B Frazee: Transponder maintenance mode method. Texas Instruments Incorporated, Brian C McCormack, James C Kesterson, Richard L Donaldson, September 12, 1995: US05450087 (40 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 ...