Election of Species

An election of species requirement is an office action from a USPTO examiner requiring the applicant to select one of several species of a claimed genus for examination: STATUTORY BASIS: 35 U.S.C. § 121 authorizes the USPTO to require restriction between distinct inventions; MPEP 806.04 and 806.04(b) specifically address election of species within a genus claim; WHEN SPECIES ELECTION IS REQUIRED: the examiner may require an election of species when: (1) the application claims a GENUS that includes multiple distinct species; (2) the species are SO DIFFERENT that they would require DIFFERENT SEARCHES to evaluate for patentability; (3) the species are not shown to be explicitly or inherently patentably indistinct (i.e., neither would be obvious in view of the other); WHAT MAKES SPECIES DISTINCT: the species are distinct if they are not separately patentable; put differently: if species A is disclosed in the prior art and species B is not, they are distinct; if species A would be obvious in view of species B, they are NOT distinct; the lack of a common relationship in structure or utility (Markush group analysis) can contribute to finding distinctness; COMMON APPLICATIONS FOR SPECIES ELECTION: MARKUSH CLAIMS: a genus claim with a Markush group often triggers species election if the Markush members span different structural classes; GENUS WITH VARYING SUBSTITUENTS: a chemical compound claim with variable R groups across different structural classes; PROCESS WITH DIFFERENT SOLVENTS/REAGENTS: if the process works fundamentally differently depending on a variable, species may be distinct; SOFTWARE WITH DIFFERENT ARCHITECTURES: an algorithm claimed to work across multiple very different technical architectures; FORMAT OF THE ELECTION REQUIREMENT: the election of species requirement identifies: the elected species options; the species the examiner proposes to examine first; the examiner's rationale for finding distinctness; a requirement to elect one species for examination; the applicant's response must either: traverse the election requirement; or make an election (provisionally with traverse, or conclusively).

Responding to an election of species requirement requires both a strategic election and often a traverse: MANDATORY RESPONSE CONTENT: (1) ELECTION: the applicant MUST elect one species for examination; the election is required even if the applicant intends to traverse; election with traverse means: 'Applicant provisionally elects Species X, but traverses the requirement as improper for the following reasons...'; (2) TRAVERSE (OPTIONAL BUT RECOMMENDED): a traverse contests whether the species are truly distinct; a proper traverse can overcome the election requirement and force the examiner to examine all species; if the traverse is not proper, the requirement stands and the elected species is examined first; GROUNDS FOR TRAVERSE: (a) THE SPECIES ARE NOT DISTINCT: neither species is patentable over the other (Examiner failed to establish distinctness); (b) SAME PRIOR ART SEARCH: the species do not require different search fields — one search covers all species (e.g., all species are covered by the same prior art class/subclass); (c) PRIOR ART SEARCH WOULD BE THE SAME: even if structurally different, the relevant prior art is identical; (d) SPECIES ARE OBVIOUS VARIANTS: one species is obvious in view of the other and a separate patentability analysis is not needed; MAKING A STRATEGIC ELECTION: if you decide to elect without a full traverse (or if your traverse fails): (a) elect the species most likely to be allowed AND most commercially important; (b) consider which species has the strongest specification support (most working examples); (c) consider which species is most difficult for the examiner to reject with the obvious prior art; ELECTION EFFECT: after election, the examiner proceeds with full examination ONLY of claims directed to the elected species; claims to non-elected species are HELD IN ABEYANCE (they remain pending but are not examined); claims to non-elected species are formally objected to as being drawn to non-elected subject matter; these claims remain in the application but will not receive office actions.

Rejoinder is a USPTO practice that allows non-elected species claims to be rejoined with the application and examined after the elected species claims are allowed: WHEN REJOINDER IS AVAILABLE: after the elected genus claims (or claims generic to the elected species) are ALLOWED, the applicant can request rejoinder to have non-elected species claims examined in the same application; REJOINDER CONDITIONS (MPEP 821.04 and 821.04(a)): (1) the genus claim that was allowed must include the non-elected species within its scope; (2) the non-elected species claims must depend on or otherwise require each limitation of the allowed genus claim; (3) the non-elected species claims must be in condition for allowance (no new art rejections needed); the applicant requests rejoinder after receiving a Notice of Allowance on the elected species; WHY REJOINDER IS VALUABLE: allows non-elected species claims to be examined WITHOUT filing a divisional application; saves on filing fees and the cost of prosecuting a separate divisional; maintains all claims in one patent (which can provide broader enforcement options); HOW TO REQUEST REJOINDER: include a rejoinder request as part of the applicant's response to a Notice of Allowance or advisory action; state that the elected genus claim has been allowed; identify the specific non-elected species claims to be rejoined; explain why the species claims are subsumed within the allowed genus claim; EXAMINER REVIEW OF REJOINED CLAIMS: the examiner reviews the rejoined species claims for: (1) antecedent basis in the specification; (2) whether new art is needed to evaluate the claims; (3) whether the claims are drawn to species that depend on every limitation of the allowed genus claim; LIMITATION OF REJOINDER: if the examiner determines that additional search is required for the non-elected species, rejoinder is denied; the non-elected species must be pursued in a divisional application; REJOINDER AND DIVISIONALS: rejoinder and divisional applications are not mutually exclusive; use rejoinder for species claims that are subsumed in the allowed genus; use divisionals for species claims that require separate examination; divisional applications claim the benefit of the parent's priority date under § 121.

Markush claims and election of species intersect frequently in pharmaceutical and chemical patent prosecution: MARKUSH GROUPS FREQUENTLY TRIGGER SPECIES ELECTION: a Markush group claim covers multiple species (all compounds within the group); if the Markush group contains structurally diverse members that would require different searches, the examiner may require species election; EXAMPLE: 'Compound of Formula I, wherein R is selected from the group consisting of alkyl, aryl, halogen, and hydroxyl' — the examiner might find that alkyl substitution and aryl substitution require different prior art searches; HOW SPECIES ELECTION APPLIES TO MARKUSH: (1) the examiner identifies sub-groups within the Markush group as distinct species (e.g., 'alkyl species' vs. 'aryl species'); (2) applicant must elect one sub-group (species) for examination; (3) non-elected sub-groups are held in abeyance; TRAVERSE FOR MARKUSH ELECTION: the traverse argument should show: all members of the Markush group have a common structural feature that gives them the same utility; a single prior art search covers all members (e.g., all are covered by the same class in prior art databases); no member is patentably distinct from others in the group; MPEP 2117 INTERACTION: the Markush common relationship requirement (MPEP 2117) applies here — if members share common structure and utility, they should not be treated as distinct species requiring separate searches; STRATEGY FOR LARGE MARKUSH GROUPS: file the MOST IMPORTANT MEMBERS as elected species (core scaffold with best substituents); pursue other members in divisional applications; use telescoping claims (broad genus in independent claim; specific Markush sub-group in dependent claim) so that allowance of the independent genus claim allows rejoinder of dependent specific claims; CASE LAW ON MARKUSH ELECTION: courts and USPTO have recognized that Markush groups with common structural features should not be split across multiple election requirements; aggressive use of traversal is often warranted when the Markush members have a recognizable common relationship.

Election of species and restriction requirements are related but distinct USPTO practice areas: RESTRICTION REQUIREMENT: a restriction requirement divides an application into separate INVENTIONS (not species of the same invention); STATUTORY BASIS: 35 U.S.C. § 121 allows restriction between distinct and separately patentable inventions; WHEN RESTRICTION APPLIES: two different types of inventions in the same application (e.g., a compound + the process for making it); related inventions are subject to restriction if they are: DISTINCT (would require separate searches to evaluate); SEPARATELY PATENTABLE (each could stand alone as a separate patent); ELECTION OF SPECIES: election of species applies when one INVENTION is claimed through a genus with multiple species; the invention is ONE (a genus concept); the issue is which species of that genus to examine first; DIFFERENT REMEDIES: RESTRICTION: non-elected inventions pursued in DIVISIONAL applications (separate serial numbers; separate prosecution; § 121 ODP safe harbor); ELECTION OF SPECIES: non-elected species can be: (a) rejoined if genus claim allowed (MPEP 821.04); (b) pursued in divisional applications; OVERLAP: sometimes both restriction and species election are required in the same application; example: an application claims both (1) a compound (Invention A) and (2) a method of using the compound (Invention B); and Invention A includes multiple species; the examiner may simultaneously restrict between inventions AND require species election within the compound genus; DIVISIONAL PROTECTION (§ 121): if a patent is divided pursuant to a restriction requirement, the two resulting divisional patents have a SAFE HARBOR from obviousness-type double patenting (ODP) rejections between each other under 35 U.S.C. § 121; this means two divisional patents can claim overlapping inventions without requiring a terminal disclaimer; this is a significant benefit of properly responding to restriction requirements.