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It is recommended to perform a prior search before filing a patent application. This search is to evaluate the state of the technology related to the material being presented, in order to determine whether the invention is in fact new and innovative. If the invention is not new, but presents, for example, a functional improvement to the already existing object, a utility model application may be filed. Some search engines are listed below:  


INPI - The National Institute of Industrial Property is the Brazilian organization responsible for the registration of Patents, Trademarks, Industrial Designs, and Software, as well as Geographical Indications. At this website, it is possible to access a database of Patents, Software Registers, Topography of integrated circuits, Geographical Indication, Trademarks, and Industrial Designs in the marketplace in Brazil.


PORTAL NEWSPAPERS (CAPES) - The Portal of Newspapers, from the Coordination for the Improvement of Higher Education Personnel (Capes), is a virtual library that gathers and makes available the best international scientific publications to teaching and research institutions in Brazil. It has a collection of more than 38 thousand titles with full text, 134 reference bases, 11 bases dedicated exclusively to patents, as well as books, encyclopedias, and reference works, technical standards, statistics, and audiovisual content.


ESPACENET - The European Patent Office is the European patenting group that registers patents and provides several tools to facilitate the search, in addition to providing a full display of patents. Espacenet contains data on more than 95 million patent documents from around the world. Support information can help you understand if a patent has been granted and if it is still in effect.


WIPO – The World Intellectual Property Organization is the United Nations’specialized agency dedicated to providing access to the international intellectual property system. The PATENTSCOPE database provides access to International Patent Cooperation Treaty (PCT) applications in full-text format on the day of publication as well as to the patent documents of the participating national and regional patent offices. Information can be searched by entering keywords, candidate names, international patent classification, and many other search criteria in multiple languages.


USPTO – - Patents The United States Patent and Trademark Office is the official US Patent and Trademark group. It has one of the most complete databases, with highly refined search options.


JAPAN PATENT OFFICE – JapanesePatent Office website