What is the difference between 37 CFR 1.136(a) and 37 CFR 1.136(b) for appeal brief extensions?

The key differences between 37 CFR 1.136(a) and 37 CFR 1.136(b) for appeal brief extensions are: 37 CFR 1.136(a): Not applicable for appeal brief extensions. 37 CFR 1.136(b): Applicable for appeal brief extensions, but requires a petition showing sufficient cause. MPEP 1205.01 clarifies: “Extensions of time under 37 CFR 1.136(a) for patent applications are not…

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