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Free detailed evaluations, comparisons, and ratings of patent search systems. Free patent search tools listed by country. Free patent resources categorized by technology. Free best practice articles in prior art searching.

TPR is a full-service search firm specializing in the search and analysis of worldwide patent and non-patent literature information.

Search patents - Cardinal Intellectual Property is the Expert in patents search, patent analysis and intellectual property asset management solution to managing patent portfolios.

Planet Patent offers US Patents, Patent Research, Search Services, and more!

IPCalculus is a global intellectual property research & analytical consulting firm. Our expertise lies in generating valuable business & competitive intelligence by gathering, analyzing and presenting IP data from scattered worldwide sources.

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We perform Japanese patent search for attorneys in patent infringement litigations. Our search includes international patents focusing on Japan patent office. Our prior art searchers are natives in local languages.

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Walsh IP delivers high-quality patent research and administrative services for IP professionals