Utter bullshit. What does the registration of a US patent have to do with anything? MP3 became part of the (international) MPEG standard in 1992, it was first introduced in 1991 and developed by the Fraunhofer Institut in Germany. The iśsuing date of the US patent is just some buraeucratic detail, it doesn’t have anything to do with the actual development and availability of the standard or the algorithm.