Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-05-28
2009-06-23
Lee, Benjamin C (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S652000, C340S657000, C340S661000, C340S662000, C340S663000, C174S050000, C174S520000
Reexamination Certificate
active
07551098
ABSTRACT:
A point of sale terminal includes a microcontroller integrated circuit. In one aspect, a regulator within the IC receives power from a supply voltage terminal and/or a battery terminal. If the regulator does not receive adequate power from either terminal, then energy stored on-chip in a capacitor is used to erase secure memory. In another aspect, pulses of current are made to pulse through conductors of a conductive mesh. A tamper condition is detected if an improper voltage is detected on the IC terminal through which the pulse is conducted. In another aspect, each vendor signs his/her firmware with his own vendor ID. A bootloader uses the vendor ID to lookup a public key that is then used to verify a private key supplied by the firmware to be executed. In another aspect, a magnetic card reader includes a digital peak detector circuit involving programmable positive and negative thresholds.
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patent: 4802207 (1989-01-01), Uchida
patent: 4804957 (1989-02-01), Selph et al.
patent: 6441733 (2002-08-01), Unterschultz
patent: 7119703 (2006-10-01), Sin
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patent: 7138841 (2006-11-01), Li et al.
Chock Raymond O.
Hess Mark
Imperium Patent Works
Lee Benjamin C
Nwugo Ojiako
Wallace Darien K.
Wallace T. Lester
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