If you invented a time machine and invented it first nobody would have bothered inventing it.
BTW, any universe in which time travel is invented will be definition either change history to prevent the invention of time travel OR will destroy itself via paradox conflicts.
Besides If I invented time travel I would deny I had done so.... So would you... you certainly wouldn't compromise the secret by preinventing others patents on other things.
There are other easier way to make money.