What is the difference between a formal statement and an informal memorandum in USPTO petitions?

In USPTO petition procedures, there are two types of examiner responses: formal statements and informal memoranda. The key differences are: Formal Statement: Made under 37 CFR 1.181(c) A copy is mailed to the petitioner by the examiner (unless otherwise directed) The original copy accompanies the application file and petition when returned to the official handling…

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