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The Lens structured patent search allows users to explore patents and patent applications from around the world. It also includes visualization features for top patent owners, inventors, and even countries.
USPTO Full Text Patent Search
Federal agency for granting U.S. patents and registering trademarks. Search for patents and trademarks issued in the U.S. Note that there is a separate database for patent applications.
European Patent Office (espacenet)
Conduct world-wide patent and prior art searches. It is simple to conduct a keyword search of patents here. You can also use the classification schema discovered here to conduct more thorough searches at uspto.gov.
Patent Research Materials