patent

She has a patent ductus arteriosus that will require surgery to close.

Those claims are patent nonsense.

letters patent

[H]e did at last think of an office which do belong to him in case the King do restore every man to his places that ever had been patent, which is to be one of the clerks of the signet, which will be a fine employment for one of his sons.

a patent right    patent medicines

["]Ben, my fine fellow, put your hand into the cupboard, and bring out the patent digester." Mr. Benjamin Allen smiled his readiness, and produced from the closet at his elbow a black bottle half full of brandy.