Patents were made public in exchange for protection. After applying for a patent, your formula will be made public. If someone wants to use your formula, they must get your consent or pay you a fee. The protection period is 20 years. After 20 years, it will enter the public sphere, and everyone can use it at will. Medical students should save lives. With such a moral standard, they can make money for 20 years and serve the society for 20 years.