What is the difference between ex parte and inter partes reexamination?

While MPEP § 2695 doesn’t directly define the difference between ex parte and inter partes reexamination, it mentions both types in the context of reexamination of a reexamination: “…regardless of whether the reexamination certificate was issued for an ex parte reexamination or an inter partes reexamination, and regardless of whether the pending reexamination proceeding is…

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