See the Secondary Sources tab for sources with summaries of patent law in each country.
As far as primary sources, Westlaw and Lexis have case law and statutes for selected countries.
Primary law for specific countries can be found on the Internet - use the guides linked below to help you find it.
Here are some patent law databases for patent law in other countries:
The following websites contain information on foreign legal systems as well as links to key legal materials. This includes cases, legislation, constitutions and other key legal materials. Most of these sites allow you to search countries alphabetically. These lists are quite comprehensive. You should have no problem finding research guides for most countries.