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US 5726435

How the QR Code Works

The 1995 patent by Toyota Central R&D Labs that invented the QR code, using three distinct corner squares with a unique 1:1:3:1:1 pixel ratio to let scanners instantly find and rea…

Statusexpired

Granted1998

Expires2015

Claims85

Forward citations250

Prior art25

AssigneeToyota Central R&D Labs Inc

InventorsMasahiro Hara, Motoaki Watabe +3

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