How many slaves did Thomas Edison own?

Thomas Edison was born in New Jersey in 1847, which means he was 16 when the Emancipation Proclamation was signed into law. Additionally, New Jersey had outlawed slavery the year before his birth, 1846. His young age at the end of slavery in the US combined with the state in which he was raised having been a Free State all his life, leads me to the conclusion that Thomas Alva Edison never owned any slaves.