When is a 37 CFR 1.131 affidavit not an acceptable method to overcome a pre-AIA 35 U.S.C. 102(e) rejection?

A 37 CFR 1.131 affidavit is not an acceptable method to overcome a pre-AIA 35 U.S.C. 102(e) rejection in certain circumstances. According to the MPEP: “When the claims of the reference U.S. patent or U.S. patent application publication and the application are directed to the same invention or are obvious variants, an affidavit or declaration…

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