Patent Law

Introduction

Patent law grants inventors the right to exclude others from making, using, selling, or importing their inventions for a limited period. The Patent Act, codified at 35 USC §§ 1-390, establishes the requirements for patentability, the application process, and the remedies for infringement. The America Invents Act (AIA) of 2011 fundamentally reformed US patent law, transitioning from a first-to-invent system to a first-to-file system.

Patentability Requirements

To obtain a patent, an invention must satisfy three statutory requirements under 35 USC §§ 101-103. Utility patents under § 101 must be a process, machine, manufacture, or composition of matter, or any new and useful improvement thereof. The Supreme Court has recognized exceptions for laws of nature, natural phenomena, and abstract ideas.

Novelty under § 102 requires that the invention not have been patented, described in a printed publication, or in public use or on sale before the effective filing date of the application. The AIA’s first-to-file system provides a one-year grace period for certain disclosures by the inventor.

Nonobviousness under § 103 requires that the invention not have been obvious to a person having ordinary skill in the art at the time of the invention. The obviousness analysis considers the scope and content of the prior art, the differences between the prior art and the claimed invention, the level of ordinary skill in the art, and secondary considerations such as commercial success, long-felt need, and unexpected results.

Types of Patents

Utility patents protect functional inventions and are the most common type, with a term of 20 years from the filing date. Design patents protect the ornamental design of a functional item and have a term of 15 years. Plant patents protect new and distinct varieties of plants and have a term of 20 years.

Patent Infringement

Patent infringement occurs when a person makes, uses, sells, or imports a patented invention without authorization. Direct infringement requires that the accused product or process contain every element of a patent claim. Indirect infringement includes active inducement of infringement and contributory infringement (selling a component that has no substantial noninfringing use).

The doctrine of equivalents allows a finding of infringement even when the accused product does not literally infringe, if the differences between the claim and the product are insubstantial. The prosecution history estoppel limits the doctrine of equivalents when claim amendments were made to overcome prior art.

The America Invents Act

The AIA transformed US patent law. The most significant change was the shift to a first-inventor-to-file system, aligning the US with international patent systems. The AIA also created the Patent Trial and Appeal Board (PTAB) and new post-grant review procedures, including inter partes review (IPR) and covered business method review.

The AIA’s IPR procedure has become a major mechanism for challenging patent validity. The PTAB may cancel patent claims that are unpatentable based on prior art. IPR proceedings use a lower burden of proof than district court litigation and have resulted in the cancellation of a significant number of patent claims.

Patent Enforcement

Patent infringement actions are brought in federal district court. The patentee may seek injunctive relief (which is subject to the eBay v. MercExchange (2006) four-factor test), damages (including lost profits or a reasonable royalty), and, in exceptional cases, attorney’s fees. The Hatch-Waxman Act governs patent disputes involving pharmaceutical products.

Conclusion

Patent law protects inventions through a detailed statutory framework that balances the incentive to innovate with public access to new technologies. The requirements of utility, novelty, and nonobviousness, the types of patents, the infringement analysis, and the AIA’s reforms define the current patent landscape. The field continues to evolve in response to technological change, particularly in software, biotechnology, and artificial intelligence.