Patent Misuse Doctrine

Patent misuse is an equitable defense to patent infringement claims: DEFINITION: patent misuse occurs when a patentee attempts to extend the scope of the patent beyond its intended coverage or uses the patent to violate antitrust law or public policy; the core concept: the patent grant gives certain defined rights — using the patent as a lever to extract rights beyond those granted is misuse; KEY DISTINCTION FROM INVALIDITY: INVALIDITY: the patent never should have issued; it is void ab initio; permanent defense; can be raised by anyone at any time; misuse does not invalidate the patent — it renders the patent unenforceable until the misuse is purged; MISUSE: equitable defense; bars the patentee from enforcing the patent in the current lawsuit while the misuse continues; once the misuse is purged and its effects have dissipated, the patentee can enforce the patent again; ORIGIN: Morton Salt Co. v. G.S. Suppiger Co. (S.Ct. 1942): Morton held a patent on a salt-depositing machine and required licensees to buy unpatented salt tablets only from Morton; the Supreme Court held this was patent misuse — Morton was extending the patent monopoly to unpatented goods; the Court refused to enforce the patent because doing so would help Morton in an improper extension of patent rights; ELEMENTS OF PATENT MISUSE: (1) the defendant establishes the patent is valid and infringed (or this is assumed); (2) the defendant then asserts misuse as an affirmative defense; (3) the court finds the patentee improperly extended the patent scope; PRACTICAL EFFECT: if misuse is found: injunction denied; damages denied; litigation stays until misuse purged; misuse is a defense in rem — it is available to all infringers while the misuse continues, not just the specific licensee who was the victim of the misuse.

Several categories of conduct can constitute patent misuse: TYING (PER SE MISUSE HISTORICALLY): a 'tie' requires licensees or purchasers of the patented product to also buy an unpatented product from the patentee; Morton Salt (1942): required purchase of unpatented salt tablets with patented machine = misuse; Mercoid Corp. v. Minneapolis-Honeywell (S.Ct. 1944): conditioning a license on use of specific unpatented components = misuse; ILLINOIS TOOL WORKS v. INDEPENDENT INK (S.Ct. 2006) — CHANGED THE LAW: the Supreme Court held that a patent does NOT create a presumption of market power in the tying product; prior to Illinois Tool Works: a patent tying case was per se antitrust violation (and therefore per se misuse) because the patent itself presumptively created market power; after Illinois Tool Works: plaintiff must prove actual market power in the tying market; result: patent tying is no longer automatically misuse or per se antitrust; plaintiff must prove market power and anticompetitive effects; 35 U.S.C. § 271(d) STATUTORY SAFE HARBORS: Congress codified specific conduct that is NOT misuse: (1) deriving revenue from acts that would be contributory infringement if performed without consent; (2) licensing or authorizing another to perform acts that would otherwise be contributory infringement; (3) seeking to enforce patent rights against infringement or contributory infringement; (4) refusing to license or use any rights to the patent; (5) conditioning license on purchase of another license or on non-assertion of a license — IF the patent owner does not have market power in the relevant market; FIELD-OF-USE RESTRICTIONS: limiting a license to specific fields of use is generally NOT misuse; a patentee can grant a non-exclusive license for pharmaceutical use only and withhold the right to use in other fields; this does not improperly extend the patent scope — it limits the grant rather than extending it beyond.

The Mallinckrodt doctrine allowed post-sale restrictions but was significantly narrowed: MALLINCKRODT v. MEDIPART (Fed. Cir. 1992): Mallinckrodt sold patented medical devices labeled 'single use only'; Medipart collected used devices and refurbished them for resale; the Federal Circuit held the single-use restriction was enforceable under patent law: if the first sale was conditioned on single use, the restriction carried with the product; violation was patent infringement, not just breach of contract; IMPRESSION PRODUCTS v. LEXMARK (S.Ct. 2017) — OVERRULED MALLINCKRODT: Lexmark sold toner cartridges at a discount conditioned on return for recycling; Impression Products bought returned cartridges, refurbished them, and resold them; the Supreme Court held: FIRST ISSUE — DOMESTIC SALES: when a patentee makes an authorized sale of a patented item in the US, patent exhaustion occurs; the patent right in that specific item is exhausted; Lexmark cannot use patent law to enforce its single-use/return restriction post-sale; Lexmark's remedy is contract law, not patent infringement; SECOND ISSUE — FOREIGN SALES: an authorized foreign sale ALSO exhausts US patent rights in the sold item; Lexmark's Quanta (foreign) sales exhausted its US patents in those cartridges; IMPACT ON MISUSE DOCTRINE: Impression Products effectively codified what was previously the misuse doctrine for post-sale restrictions: a patentee who uses patent law to enforce post-sale restrictions is asserting rights beyond what the patent gives; the authorized first sale exhausts those rights; patentees can still use contractual post-sale restrictions, but breach is a contract claim, not a patent infringement claim; SURVIVING RESTRICTIONS: non-exhausted sales: unlicensed or conditional sales where the condition was clearly communicated can preserve patent rights; sale of a component that does not itself embody the complete patented combination: exhaustion may not apply (Quanta Computer v. LG Electronics analyzed this).

Post-eBay and post-Illinois Tool Works, patent misuse has narrowed significantly: CURRENT STATE OF THE DOCTRINE: the Federal Circuit has significantly narrowed patent misuse in recent decades; Princo Corp. v. ITC (Fed. Cir. 2010) (en banc): patent misuse requires that the patentee broaden the physical or temporal scope of the patent grant with anticompetitive effect; mere licensing restrictions that do not expand the scope of the patent are generally not misuse; RULE OF REASON ANALYSIS: for most alleged misuse (other than the specific § 271(d) categories), courts apply the rule of reason: what is the relevant market?; does the patentee have market power?; what are the anticompetitive effects?; are there procompetitive justifications?; this is essentially antitrust analysis; per se misuse is rare today; TYING AFTER ILLINOIS TOOL WORKS: no longer per se misuse; must show: (1) patent confers market power in tying product; (2) substantial amount of commerce in the tied market is affected; (3) anticompetitive effects outweigh procompetitive benefits; CROSS-LICENSING CONCERNS: grantback clauses in cross-licenses: if a licensee is required to grant back improvements exclusively to the licensor, this may be misuse; non-exclusive grantbacks are generally acceptable; package licensing: requiring a licensee to take a license to a portfolio (not individual patents) is generally not misuse unless the package creates market power concerns; FIELD-OF-USE RESTRICTIONS: completely acceptable and not misuse; the patentee owns the right to limit use; ROYALTIES ON UNPATENTED PRODUCTS: conditioning license royalties on sales of products that don't use the patent = misuse; Brulotte v. Thys (S.Ct. 1964): collecting royalties after patent expiration = per se misuse (controversial but still good law).

Purging misuse is required before a patent becomes enforceable again: PURGING MISUSE: once found, misuse renders the patent unenforceable until purged; the patentee must: (1) affirmatively abandon the misuse conduct; (2) allow the effects of the prior misuse to dissipate from the market; simply filing a new lawsuit does not purge misuse; the patentee must show the harmful effects have been eliminated; HOW TO STRUCTURE LICENSES TO AVOID MISUSE: PERMISSIBLE: field-of-use restrictions (pharmaceutical use only; US use only; consumer products only); exclusive licenses in specific fields; non-exclusive grantbacks (licensee grants licensor a non-exclusive license to licensee's improvements); reasonable royalty rates tied to the licensed patent; termination provisions; post-expiration royalties if paying for deferred compensation for pre-expiration use (contested); PROBLEMATIC OR RISKY: package licenses requiring bundled patents if there is evidence of market power; tying unpatented goods as a condition of the patent license; requiring loyalty to the licensor (not competing with or not challenging the patent); royalties on products that do not practice the patent; requiring payment after all licensed patents expire; conditioning license on suppression of competing technology (Princo situation); BRULOTTE v. THYS ISSUE: Supreme Court held in Brulotte (1964) and reaffirmed in Kimble v. Marvel (2015): collecting royalties for use of a patented device after the patent's expiration is per se misuse; this rule is controversial and criticized as formalistic; but Congress has not changed it and the Supreme Court declined to overrule it; PRACTICAL WORKAROUND: structure post-expiration payments as deferred payment for pre-expiration use; tie royalties to a basket of patents so last-expiring patent term controls; PATENT MISUSE vs. INEQUITABLE CONDUCT: both are unenforceability defenses; inequitable conduct requires intent to deceive the USPTO during prosecution; patent misuse focuses on post-grant conduct and overreaching licensing/enforcement behavior.