The man who first isolated CBD in 1940.

The article can be found at https://www.vice.com/en/article/the-us-government-has-sent-this-guy-300-joints-each-month-for-34-years/

Apparently patents are public information/knowledge. According this 22 year old patent US6630507B1, which is owned by the US Department of Health and Human Services, it says cannabinoids are antioxidants and they also protect the brain. Why is this illegal again?