Decision to grant ( post grant review ) is within 3 months patent owner response.

In ex parte reexaminations, interviews between a patent owner and the examiner are permitted after the issuance of the first official action in a reexamination proceeding. Rule 1.560(b) requires that the patent owner provide a complete written statement of the reasons presented at the interview as warranting favorable action. This statement must be filed as a separate part of an outstanding Office Action or as a separate paper within one month from the date of the interview, whichever is later. Failure to provide this written summary of the interview will result in the abandonment of the reexamination, even if a complete response to the Office Action is provided. The Office has abandoned several ex parte reexaminations under these circumstances.

The written statement must be filed as a separate part of response to an office action

outstanding at the time of the interview ,or as a separate paper within one month from

the date of the interview which ever is later.