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

While MPEP ยง 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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