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USPTO
United States Patent and Trademark Office. The PTO site includes statutes, rules, MPEP, searching of patent, and submission of patent documents.
EPO
European Patent Office. Similar to the USPTO, this page offers numerous links to information about patent
information centres and seminars as well as a search engine. The search engine is
espacenet, which includes not only European patents, but worldwide patents.
PAJ
Japanese Patent Office. The Industrial Property Digital Library (IPDL) offers the public access to IP Gazettes
of the JPO free of charge through the Internet. The search interface is called PAJ.
Canadian Intellectual Property Office
CIPO administers disseminates IP information. IP information includes Patents, trademarks
and copyrights. A searchable patent database is available which includes patent descriptions and images.
Top Notch Engineering engineering and consulting firm. Link
Free PDF patents
Provides free PDFs of US patents and publications.
Google's Patent Search
Patent and application search engine by Google
USPTO search page
The Patent search page of the USPTO.
espacenet
Engine for searching patents from organizations worldwide. Includes images of all patents
in their original language.
Community of Science
Fully searchable bibliographic file containing all of the approximately
U.S. Patents issued since 1975; updated weekly. This database
also tracks the lineage of patents, providing you with links to references
within that patent and links to other patents which cite that particular
patent.
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