About the patent

Patents pertaining to the QR Code

DENSO WAVE INCORPORATED has a number of patents on QR Code. (The following are examples).
Everyone can use the QR Code freely as long as following the standards for QR Codes in JIS or ISO. If you are contemplating uses of QR Codes that do not follow the standard, please consult with DENSO WAVE beforehand. (Inquiry)
Related page: FAQ(QR Code’s intellectual property right)

Patent Number
Title
JP2938338
Two-dimensional code
JP2867904
2D code reading device
JP3716527
Reading method for 2D code
JP3726395
2D code and reading method for 2D code
JP3843595
Medium for printing optically readable information, optical information reading device and information processing device
JP3996520
Two dimensional information code and its generation
US5726435
Opticaly readable two-dimensional code and method and apparatus using the same
US5691527
Two dimensional code reading apparatus
US7032823
Two-dimensional code, methods and apparatuses for generating, displaying and reading the same

(Other many hundreds of patents)