Denso Wave owns a number of patents on QR code technology, but has chosen to exercise them in a limited fashion. In order to promote widespread usage of the technology Denso Wave chose to waive its rights to a key patent in its possession for standardized codes only. In the US, the granted QR code patent is US 5726435, and in Japan JP 2938338, both of which have expired. The European Patent Office granted patent EP 0672994 to Denso Wave, which was then validated into French, UK, and German patents, all of which expired in March 2015.
Denso Wave owns a number of patents on QR code technology, but has chosen to exercise them in a limited fashion. In order to promote widespread usage of the technology Denso Wave chose to waive its rights to a key patent in its possession for standardized codes only. In the US, the granted QR code patent is US 5726435, and in Japan JP 2938338, both of which have expired. The European Patent Office granted patent EP 0672994 to Denso Wave, which was then validated into French, UK, and German patents, all of which expired in March 2015.