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Reissued patent

A "reissued" patent is a patent in which an error was found, and which was reissued after this error was fixed.

In the USA, they get special patent numbers, prefixed with "RE", and the number is much lower than a normal patent. For example, a patent originally granted by the USPTO as number "5,367,685" was later reissued as "RE38,104". (This patent was used in the case Oracle v. Google (2010, USA))

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