From what I have read, the patent doesn't stop anyone from making the product, it merely gives the patent holder a right to sue for royalties. My father worked for IBM and his name is on dozens of patents. While he worked for them, they owned the rights to anything he developed or invented(typical contract in that industry I guess), but since IBM doesn't sell fishing equipment, he was told that if he invented a new fishing reel their lawyers would file the patenting in his name at their cost and he would have full ownership. He gets no royalties for his other patents, just awards and the salary/bonus he made as an employee.
In all likelihood he is getting a unlimited-use license from IBM. But he cannot sell the patent to somebody else, nor can he obtain royalties.