**Abstract**

The right to appeal exists as a response to the two main characteristics of every human being. The first refers to the attitude of not settling for adverse decisions, which leads people to seek instruments to remediate these decisions, while the second is the possibility that every human being has to make mistakes and the need to correct these mistakes in decision-making acts that may have been mistaken. Therefore, an appeal is an instrument that enables review of a decision by a higher authority to obtain its modification or revocation. In the patent system, appeals are used basically to reverse decisions of patent examiners during the examination procedure as, for example, the decision to reject a patent. Although all patent offices have procedures for appeal against first-instance decisions taken by these offices, there are significant differences as to how this procedure is conducted in each office. This chapter will study the laws and regulations, rules and procedures on appeals in two of the main patent offices in the world – the European Patent Office – EPO and the United States Patent and Trademark Office – USPTO, and in the Brazilian Patent Office – INPI, pointing out the main differences between them.

**Keywords:** appeal, patent, patent examination, industrial property, patent offices
