Standing in Patent Cases

Standing to sue for patent infringement in US federal court is governed by Article III constitutional requirements and specific patent law rules: PATENT OWNER (PATENTEE): the patent owner — the person or entity listed on the patent, or the successor in interest through an assignment — has automatic standing to sue; a patent owner who assigns all rights loses standing and the assignee gains it; EXCLUSIVE LICENSEE WITH ALL SUBSTANTIAL RIGHTS: an exclusive licensee who received ALL substantial rights in a patent is treated like a patent owner and has standing to sue in its own name; this is determined by substance, not form — the label 'exclusive license' is insufficient without actual transfer of all substantial rights; NON-EXCLUSIVE LICENSEE: a non-exclusive licensee has NO standing to sue for patent infringement even if the patent owner supports the suit; Rite-Hite Corp. v. Kelley Co. (Fed. Cir. 1995 en banc): non-exclusive licensees are mere contractual parties, not patent rights holders; CO-OWNER: a co-owner of a patent can sue infringers only by joining ALL other co-owners; Ethicon, Inc. v. United States Surgical Corp. (Fed. Cir. 1998): a co-owner cannot maintain suit without joining the other co-owners; CONSTITUTIONAL BASIS: Article III standing requires (1) injury in fact (2) traceable to the defendant (3) redressable by courts; patent infringement causes injury in fact to the patent holder and its exclusive licensees.

Courts look at the totality of the rights transferred to determine if an exclusive licensee received 'all substantial rights': FACTORS INDICATING ALL SUBSTANTIAL RIGHTS WERE TRANSFERRED (exclusive licensee = effective patent owner): (1) RIGHT TO SUE: the licensee has the exclusive right to sue infringers (often the most important factor); (2) RIGHT TO SUBLICENSE: the licensee can grant sublicenses without the patent owner's approval; (3) EXCLUSIVITY: the license is fully exclusive — not limited by territory, field of use, or customer; (4) RIGHT TO ASSIGN: the licensee can transfer its rights to third parties; (5) PATENT OWNER RETAINED ONLY REVERSIONARY RIGHTS: the licensor only retains the right to get the patent back if the licensee breaches; (6) NO CONSENT REQUIRED FOR SETTLEMENT: the licensee can settle infringement disputes without the patent owner's consent; FACTORS INDICATING NOT ALL SUBSTANTIAL RIGHTS WERE TRANSFERRED (patent owner must join suit): (1) FIELD-OF-USE LIMITATION: license covers only one product category or use; (2) TERRITORIAL LIMITATION: license is limited to certain states or regions; (3) LICENSOR RIGHT TO SUE: the patent owner retained the right to sue; (4) SUBLICENSE APPROVAL: sublicenses require licensor consent; (5) REVERSIONARY RIGHTS BEYOND BREACH: licensor has broad rights to recapture the patent; (6) ASSIGNMENT RESTRICTION: licensee cannot assign without consent; TOTALITY APPROACH: courts look at the overall bundle of rights transferred; no single factor is dispositive; a retained right to sue (by the licensor) is strongly indicative that the license is not a full transfer.

Patent co-ownership creates a mandatory joinder problem that can prevent either co-owner from suing without the other's cooperation: CO-OWNERSHIP BASICS: under 35 U.S.C. § 262, each joint owner of a patent may make, use, offer to sell, and sell the patented invention and license others to do so without the consent of and without accounting to the other joint owners; EFFECT ON ENFORCEMENT: co-owners cannot independently sue infringers; ALL co-owners must be party plaintiffs to bring an infringement suit; Ethicon v. United States Surgical (Fed. Cir. 1998): a co-inventor who co-owns a patent can refuse to join an infringement suit, effectively blocking the other co-owner's ability to enforce; CO-OWNER REFUSAL SCENARIO: if one co-owner refuses to sue (perhaps because they licensed the infringer or because they are competing with the other co-owner), the non-refusing co-owner cannot maintain an infringement suit alone; this can make a patent completely unenforceable against infringers if one co-owner is unwilling to litigate; INVOLUNTARY JOINDER: unlike other intellectual property, a patent co-owner cannot be made an involuntary plaintiff in federal court; if a co-owner refuses to join, the case must be dismissed; LICENSING SOLUTIONS: to avoid this problem, co-owners should execute written agreements allocating licensing and enforcement rights to one co-owner; exclusive licensing arrangements can vest enforcement standing in one party; COMMON CO-OWNERSHIP SITUATIONS: joint inventorship (two inventors, no assignment to a common owner); university-industry collaborations (both parties named on the patent); failure to assign (inventor who is also a co-owner did not assign to the employer).

If an exclusive licensee brought suit without standing, there are limited options to cure the defect: JURISDICTIONAL PROBLEM: standing is jurisdictional — the court lacks subject matter jurisdiction if neither the patent owner nor an entity with all substantial rights in the patent is a plaintiff; CURING BY ADDING PATENT OWNER: if the exclusive licensee does not have all substantial rights, the patent owner can be joined as co-plaintiff to provide the necessary standing; this can sometimes be done during litigation if the statute of limitations has not run on the patent owner's own claims; NUNC PRO TUNC ASSIGNMENTS: parties sometimes execute retroactive ('nunc pro tunc') assignments to make the plaintiff a proper patent owner as of the suit's filing date; courts have split on whether this cures the jurisdictional defect retroactively; Abraxis Bioscience v. Navinta (Fed. Cir. 2010): a nunc pro tunc assignment executed after the complaint cannot retroactively cure a lack of standing at the time of filing; PRACTICAL IMPLICATION: due diligence before filing an infringement suit must confirm that the plaintiff has all substantial rights or that the patent owner is named; CONTRACTUAL PROTECTIONS: exclusive licensees should negotiate for the right to compel the patent owner to join as co-plaintiff, and a right to bring suit in the patent owner's name if the patent owner refuses; LICENSE REVIEW BEFORE LITIGATION: patent litigators review the full chain of title and license agreements before filing to confirm standing; a standing defect discovered mid-trial can be catastrophic.

Patent assignment and licensing have fundamentally different effects on standing: PATENT ASSIGNMENT: an assignment transfers legal title to the patent to a new owner; the assignee becomes the patent owner and has full standing to sue; the original owner loses standing after a full assignment; partial assignments (assigning an undivided interest) create co-ownership; assignments must be in writing under 35 U.S.C. § 261; assignment must be recorded at the USPTO within 3 months or subsequent assignees for value without notice take priority; EXCLUSIVE LICENSE (ALL SUBSTANTIAL RIGHTS): treated like a functional assignment for standing purposes; the exclusive licensee has standing even without formally taking title; courts look at substance over form — if all meaningful rights pass to the licensee, it is effectively an assignment; EXCLUSIVE LICENSE (LESS THAN ALL SUBSTANTIAL RIGHTS): the exclusive licensee has some standing to sue but MUST join the patent owner as a co-plaintiff; the patent owner has standing; the licensee typically lacks standing to sue alone; NON-EXCLUSIVE LICENSE: grants the licensee the right to practice the invention; no standing to sue — only a contract right to use; NON-EXCLUSIVE LICENSEE AS INVOLUNTARY PLAINTIFF: in some circuits, if the exclusive licensee has less than all substantial rights but sues, the patent owner can be joined as an involuntary plaintiff rather than dismissing the suit entirely; SHOP RIGHTS: an employer's right to use an employee's invention (where there is no assignment); shop rights are non-exclusive licenses and do not provide standing to sue; STANDING AND DAMAGES: even if the exclusive licensee has standing to sue, its ability to recover damages (lost profits vs. reasonable royalty) depends on the specific rights granted by the license.