Before filing a patent application, it is important to inform yourself about the current state of the art and the respective patents which exist in that field.
Patents speak their own language, they are not always easy to understand. Thus, after a self-created overview, it is often recommended to dig deeper into the existing literature and seek the help of a patent attorney. Keep the following questions in mind when doing your due diligence: In what aspects does your invention go beyond the state of the art? How can your knowledge, in general, be protected considering the state of the art?
Moreover, also Patent offices provide comprehensive information about the patent stock in online databases. Here, you will find an evaluation of the most important patent data search engines:
In most cases, a reliable search should be conducted by a patent attorney or a company specialized on patent document research.