Chemical Engineering

Canadian patents from January 1, 1869 to current.

Search here for both granted patents (left box) and filed but not-yet-granted patents (right box).
The USPTO Patent and Published Application Image Databases now use PDF images

A free patent searching tool. Retrieves pdf copies of US patents.

Search the approximately seven million U.S. patents by date, issue date, patent number and inventor. The beta version looks back at inventions all the way to the 1790s but does not include patent applications, international patents or U.S. patents issued since mid-2006.

This database enables you to search the patent applications published by the European Patent Office over the last 24 months

Formerly Patent Lens

Using PATENTSCOPE you can search 51 million patent documents including 2.8 million published international patent applications (PCT).