These are not normally available at course bookmakers but are common bets at off-course bookies. Sometimes I enjoy having a Patent to add some spice to a dull afternoon at work, though I'm not adventurous enough for the more elaborate bets! When combinations come off you can make a lot of money - though it's more likely that you will get a small amount back. It's risky - know what you are doing!
A Patent is a bet on three horses in different races (maybe at different meetings), made up of three straight Win bets, three doubles and a triple, making seven bets in all. So a one pound Patent will cost you 7 pounds.
A Yankee is a bet on four horses - eleven separate bets (6 doubles, 4 triples, 1 quadruple). There are no singles in a Yankee - it simply isn't worth it, though a Yankee with the four singles is available and is called a Super 15.
A Canadian involves five horses. 10 doubles, 10 triples, five quadruples and a quintuple.
A Heinz is six horses. It doesn't take a genius or a mathematical wizard to guess that there are 57 bets in a Heinz, though just to prove I can do it, it's 15 doubles, 20 triples, 15 quadruples, 6 quintuples and a sextuple.
With seven or more horses, my brain starts hurting...