Novelty is a basic requirement of patent law. An inventor cannot obtain a patent if the invention exists in the “prior art,” a term that generally refers to knowledge and technology already in the public domain. Interestingly, an earlier-filed patent document qualifies as prior art as of its...

The patent system gives the courts discretion to tailor patentability standards flexibly across technologies to provide optimal incentives for innovation. For chemical inventions, the courts deem them unpatentable if the chemical lacks a practical, non-research-based use at the time patent...

The novelty requirement seeks to ensure that a patent will not issue if the public already possesses the invention. Although gauging possession is usually straightforward for simple inventions, it can be difficult for those in complex fields like biotechnology, chemistry, and pharmaceuticals....

It is axiomatic that once an invention has been patented, it cannot be patented again. This aligns with the quid pro quo theory of patents — the public would receive nothing new in exchange for the second patent. Enforcing this rule is done through the novelty requirement, which bars a patent...

A bedrock principle of patent law is that old inventions cannot be patented. And a new use for an old invention does not render the old invention patentable. This is because patent law requires novelty—an invention must be new. But while a new use for an old invention does not make the old...

Patent law doesn’t look kindly on patent owners who engage in wrongdoing involving the patent. The U.S. Supreme Court and lower courts have refused to enforce patents tainted with inequitableness, fraud, or bad faith. This issue typically arises in patent litigation when an accused infringer...

Innumerable inventions implicate public health—including drugs, vaccines, dietary supplements, and sewage treatment plants. Over the past century, the Patent Office and the courts have modulated the ability to obtain or enforce patents for these inventions—whether in response to a public...

This paper considers the prospect of a government patent buyout in a model of endogenous growth. To this end, I modify a standard quality ladder growth model by incorporating possibility of imitation, and rent protection activities (RPAs) by the innovator. The government finances the buyout by...

Courts often state that patents are justified by disclosure theory, the idea that patents are awarded as quid pro quo for the public disclosure of inventions. But many commentators have argued that disclosure theory should be accorded no weight in the design of the patent system because patented...