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Reissued patent
A "reissued" patent is a patent which has been re-examined, in light of new art or a need to change the language of the claims, and which was reissued. A reissued patent may have absolutely no changes, that is the patent is affirmed by the patent office as valid as is, or may have extensive changes negotiated with the patent office.
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))
