What is the “upon finding allowable subject matter” rule in Markush claim examination?

The “upon finding allowable subject matter” rule in Markush claim examination refers to the process where an examiner, upon finding allowable subject matter, extends the search to all members of the Markush group. This is explained in MPEP 803.02: “If the examiner determines that the elected species is allowable, the examination of the Markush claim…

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