Google Patents searches the USPTO, so your results will only be American patents.
United States Patent and Trademark Organization (USPTO)
* Patents issued from 1790-1975 are only searchable by patent number, issue date, and U.S. classification.
* Patents issued from 1790-1975 are only searchable by patent number, issue date, and U.S. classification.
Canadian Intellectual Property Office (CIPO)
* Texts from the abstract and claims sections isn't availble for patents issued before August 15th, 1978. You can only retrieve these patents by searching for their patent number, titles, owner/inventors, or classification.
World Intellectual Property Office (WIPO)
Here is a link to other patent offices of the world.
You can search for patents through several of Ontario Tech's databases.
Intellogist: has patent related tools, as well as information and comparisons between key patent databases.