Patentes y marcas
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Here you will find a number of links to the official patent search services in several countries. In them you will find patented inventions but keep in mind that not only patented inveciones are an impediment to filing a patent but unpatented inventions are too. If you want a complete search of the state of the art you have to hire the services of Intellectual Property Firm specialized in patent search .
If you wish to register a patent or utility model, it is also advisable to hire the services of a professional.