Private Law Theory

ABSTRACT
I argue that the two types of damages described in the Patent Act are more than a menu of compensatory options. They describe two distinct types of harm caused by patent infringement. Each comes with a distinctive cluster of remedies. Harm to Product Markets (HPM) is redressed by lost profit damages, and in most cases a permanent injunction against future infringement. This type of damages can be thought of as the mirror image of damages for violations of antitrust law. Antitrust cases are about illicit lack of competition: a wrongful reduction in the competitive state of a product market. Patent damages are about illicit competition: the presence of an unauthorized competitor (the infringer) wrongly increasing the level of competition in the market for the patented item. Odd as it may seem to students of microeconomics, HPM damages are all about giving compensation for interference with a virtuous, or at least statutorily-protected, monopolist.

The other type of harm, Lost Licensing Opportunity (LLO), occurs when a patent owner is not a participant in the product market for products embodying the patented invention. The traditional remedy of a reasonable royalty is applied in these cases: the law in effect writes a hypothetical contract in which the patent owner licenses its patent to the infringer. Compensation takes the form of an estimate of the value the infringer gained by using the patent owner’s technology as an input. When the input adds real value, and the infringer who used it has at least general notice that the input is patented, the reasonable royalty measure of damages does much the same as HPM damages. The only difference is that damages in LLO cases are measured in markets for patent licensing, rather than for patented products.

But not all LLO harm is truly equal. Not all involuntary conferral of benefits should be thought of as the equivalent of a market exchange. Restitution emerged as a distinct branch of equity to address just this issue. Restitution principles reflect the fact that sometimes a benefit is conferred not on a willing market participant, but on a recipient who never asked for the ‘benefit’ and had no effective notice of it; would prefer not to have received it; and in some cases is the victim of strategic, opportunistic tactics that make ‘receipt’ of the benefit unavoidable. One example from patent law is when a patent owner alters patent boundaries to capture some of the value of the recipient’s own contributions (‘engineered encroachment’, as I refer to it). In most contemporary private law interactions, the law protects the innocent defendant by requiring fault or intent before liability is imposed. But lack of notice, and the good vs. bad faith of the patent owner, are irrelevant in patent law’s regime of strict liability for direct infringers. My proposal here is for courts to sort out the different types of LLO harm using traditional principles of restitutionary recovery. When a patented, intangible input (benefit) is used (received) by an infringer, patent courts should deploy the full spectrum of restitutionary doctrine in pursuit of interparty fairness under the facts of each infringement case. In extreme cases of ‘engineered encroachment’, for example, courts might deny any recovery for infringement.

Merges, Robert P, Two Patent-Related Harms, Two Remedies: Injury to Market and Uncompensated Input Use (May 5, 2024).