Book two; The Chamber of Secrets.
Draco uses it on Harry during Dueling club, that is when the snake appears and Harry starts talking to it.
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luna lovegood uses this spell to fix harry's nose after draco malfoy breaks it. this was in the sixth book.
I never heard the word "patration" in the context of Harry Potter (or otherwise). Check the spelling - perhaps you spelled it wrong.
It was the result of a spell. However, since this didn't occur in the book it is not known what spell was used.
Harry Potter's patronus takes the shape of a stag, the animagus and patronus form of his father. The Patronus spell is used against Dementors but can also be used as a method of communication.
Finite incantatem. It does other stuff too, but that is one of them:) ~PippiQ Pembrooke