Google Patents url: https://patents.google.com/
It is a quick and easy way to look for patents. Google patents database is built using patents from 17 patent offices* around the world. The database contains over 87 million patent publications including.
*United States, Europe, Japan, China, South Korea, WIPO, Russia, Germany, The United Kingdom, Canada, France, Spain, Belgium, Denmark, Finland, Luxembourg and the Netherlands.
Note: All search operators should be in capitalized form.
Note: Wildcards, AJD, AJDx, AJD/x, +xw, NEAR, NEAR/x, / xw, WITH and SAME are not robust search operators and do not work consistently.
Note: Using TI=<text>, AB=<text>, and CL=<text> to search title, abstract and claims may generate inconsistent result.
Instead of typing the keywords you can fill the respective fields available on the left. These can be viewed after you search your first keyword.