an official document conferring a right or privilege

a privilege or licence

/ʹpaytənt/ readily visible or intelligible; not hidden or obscure; perfectly obvious

It was so patent a truth that if he were not a doctor there was nothing else he could be, that a doctor he persisted in being — Henry James

protected by or made under a patent

protected by a trademark or a trade name so as to establish proprietary rights like those conveyed by a patent; proprietary

patent drugs

said of a passage or duct in the body: affording free passage; unobstructed

a patent opening