Google Scholar's Advanced Scholar Search can now be used to find patents and legal opinions. Search options include all legal opinions and journals, search only US federal court opinions, and search only court opinions from individual states.
Can search for patents and also learn more about legal issues and procedures. Tutorial on how to search. Can search free-of-charge. The services are operational and are updated on a daily, weekly and monthly basis respectively.
Maintained by the World Intellectual Property Organization, this facility allows you to search 1,344,736 international patent applications and to view the latest information and documents available to the International Bureau.
Definitions, application forms and instructions, handbooks, notices, and patent attorney directory are just a few of the products provided. Includes design patents and reissued patents as well as patents currently in application process (coverage starts March 2001). Full-text searching is available.
WikiPatents is one of the largest free databases of patents open for public comment on the internet, allowing PDF downloading of patents, free patent translation into multiple languages and additional information and resources.
These collections include Hague, JOPAL (non-patent reference), Madrid and PCT data and support fully searchable information retrieval and display by users on demand. Access to the Digital Library is available to the general public.