Stereobelt information

The Stereobelt was a personal stereo player devised by Andreas Pavel, a former television executive and book editor. Pavel filed a patent of invention for his portable music player in Italy in 1977, and adopted the same protective steps in Germany, United Kingdom, United States, and Japan. He sought royalty fees and later commenced legal proceedings against Sony Corporation after the Walkman released commercially in 1979, believing the electronics manufacturer had infringed his intellectual property. Judges ruled against him, revoking the patent, stating his concept was "not significantly inventive".