There needs to be 3 selections (legs) to place a Patent.
It consists of 7 bets in total, including: 3 x Singles, 3 x Doubles, 1 x Treble
At least 1 selection must win to earn a return.
Example
With 3 legs selected (A, B & C), a Patent will contain the following bets:
Bet 1: A (single)
Bet 2: B (single)
Bet 3: C (single)
Bet 4: A x B (double)
Bet 5: A x C (double)
Bet 6: B x C (double)
Bet 7: A x B x C (treble)