Question 13
Domain 2: Patent Application Filing and Claim DraftingA Markush claim is a special type of patent claim that:
Correct answer: B
Explanation
A Markush claim is a claim format that recites a closed group of alternatives, typically using the phrase “selected from the group consisting of.” That language limits the claim to the listed members and excludes unlisted options, which is why it is used for claiming alternative species in a single claim.
Why each option is right or wrong
A. Claims a method of manufacturing
B. Lists alternatives using 'selected from the group consisting of' language
Markush claiming is the recognized patent-claim format for reciting a finite, closed group of alternatives in one claim, and the standard drafting phrase is “selected from the group consisting of.” Under U.S. patent practice, that wording confines the claim to the enumerated members and excludes unlisted substitutes, which is why it is used to capture alternative species without opening the claim to every possible option.
C. Claims only the best mode of the invention
D. Is limited to design patent applications