https://patentbrief.org/company/toyota-central-rd-labs-inc Plain-English explanations of patents assigned to Toyota Central R&D Labs Inc, newest first. en-us Sat, 13 Jun 2026 10:14:25 GMT https://patentbrief.org/patent/us/5726435/qr-code-two-dimensional-barcode 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 read the code from any angle. Tue, 10 Mar 1998 00:00:00 GMT https://patentbrief.org/patent/us/5726435/qr-code-two-dimensional-barcode