Searching for Patents can be tricky because of language or descriptions used. Keyword searching may not be comprehensive so you may need to try different keywords and databases to search for patents. Two resources we could suggest for indepth patent search analysis, see: Patent Information Users Group (PIUG) and Current Challenges in Patent Information Retrieval, ed. by Mihai Lupu, et al.
Below are some databases that you can search for patents:
The European Patent Office (Espacenet) offers free access to more than 70 million patent documents worldwide, containing information about inventions and technical developments from 1836 to today.
Canadian Patents Database lets you access 93 years of patent descriptions and images. You can search, retrieve and study more than 2,130,000 patent documents.
Scopus, the SciVerse Hub product also searches for web and patent documents, resulting in a more productive search.
To see these additional results, click Web or Patents in the Go to results line above your search results. Clicking these links opens SciVerse Hub© where you can view your results there.
Free Patents Online (FPO) was developed in the classic mould of innovation – the “better mouse trap” – making patent research faster, easier, and more accessible than ever before. Further, it was built with the evolving model of the web and open access – FPO is responsible for much of the democratization of patent data, search, and analytics by bringing it to so many people – and doing so with professional standards (fast and accurate search, up-to-date data, feature-rich tools such as alerts, portfolios, and collaboration).
Patents.com is a global search engine for Patent information. The site was founded with the ambitious goal of serving as the world's most complete repository of patents from around the world -- all free of charge.
Patent Lens: A free public resource for patent system navigation worldwide.