What is the difference between appealable and petitionable matters in patent prosecution?

In patent prosecution, there is an important distinction between appealable and petitionable matters. MPEP 1201 states: “The line of demarcation between appealable matters for the Board and petitionable matters for the Director of the U.S. Patent and Trademark Office (Director) should be carefully observed.” Generally, appealable matters relate to the merits of the patent application…

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