+1 to "it depends upon your contract" It also depends upon your role. If you are hired to invent new things then it is no good claiming that an invention you s

+1 to "it depends upon your contract" It also depends upon your role. If you are hired to invent new things then it is no good claiming that an invention you seek to sell on your own account does not belong to your employer of the time - even if you only worked on it at home.