Submitted by operator on Thu, 16/03/2017 - 14:21 Provided by the European Patent Office, Espacenet offers more than 90 million patent documents from the 19th century right up to today. Espacenet Biomedical EngineeringBiotechnologyCivil EngineeringComputer Science and EngineeringElectrical EngineeringChemical and Environmental EngineeringIndustrial Systems and EngineeringPhysics and Space Engineeringpatents, handbooks, legalFree/Open Access