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Question: When does a Markush claim contain an ‘improper Markush grouping’? Answer: A Markush claim contains an “improper Markush grouping” if either: (1) the members of the Markush group do not share a “single structural similarity” or (2) the members do not share a common use. Chapter Details: The answer to this question can be […] The post MPEP Q & A 230: What is an ‘improper Markush grouping’? appeared first on Patent Education Series.