The US government has granted to Trolley Scan a patent detailing its unique protocol for reading many transponders with a reader. Due to the legal process, protection is backdated to May 1998 when the initial patent was filed in South Africa.
The protocol is an important step in the technology development for low cost RFID, as it allows many very simple transponders to communicate their identity to a reader on a single operating frequency; and even in situations where all the transponders have identical data.
The protocol also allows EAS features to be incorporated in the transponders and controlled via the reader - setting up the situation where unmanned checkouts with full EAS checking can be implemented in supermarkets.
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