The patent law was created in order to protect intellectual properties that a person made. (It could be arts, scientific inventions, or even tangible designs)
If another person who do not held the patent try to produce the intellectual properties, that person will be tried in court and most likely be forced to compensate the patent holder.
Because of this, smart inventors who are able to produce useful things but do not have enough capital to compete in the market can be encouraged to join the competition.
