"Season 2 Episode10"@en . "2015-04-19"^^ . "__TOC__"@en . "__TOC__"@en . . . . "Patents"@en . "A number of yo-yo patents have been granted through the years. These patents cover specific yo-yo innovations, response systems, weighting systems and others. The first US yo-yo patent was recorded in 1866."@en . "Patents"@en . "A number of yo-yo patents have been granted through the years. These patents cover specific yo-yo innovations, response systems, weighting systems and others. The first US yo-yo patent was recorded in 1866."@en . . . . . . "Patents"@en .