Canadian Patents Database.
http://patents1.ic.gc.ca/intro-e.html

DEPATISnet is a service provided to you by the German Patent and Trade Mark Office. One can conduct online searches in patent publications from around the world stored in the database of DEPATIS, the in-house patent information system of the GPTO.
http://depatisnet.dpma.de/

The DPD database is a resource for members of the general public interested in fields like genomics, genetics and biotechnology. The DPD contains a collection of DNA-based patents and patent applications issued by the United State Patent and Trademark Office, (USPTO), and makes the full-text versions of such patents available at no cost to the public. This searchable database allows researchers to track data or trends of patents and patent applications in categories such as the date of issue, the inventor or the receipt of government funding.
http://dnapatents.georgetown.edu/

Directory of european patent databases.
http://ep.espacenet.com/

FreePatentsOnline provides access to millions of patents.
http://www.freepatentsonline.com/

Over 7 million patents.
http://www.google.com/patents?hl=en

Jpo_prt - a library of patented protein sequences from the Japanese Patent Office in the public domain.
http://srs.ebi.ac.uk/srs6bin/cgi-bin/wgetz?-page+LibInfo+-id+1rbNl1KbLj1+-lib+JPO_PRT

This is a set of biology-related abstracts of patent applications derived from data products of the European Patent Office (EPO). Patent documents from Europe (EP), USA (US) and World (WO) are included.
Abstracts are extracted from the ESPACE ACCESS and GlobalPat CD/DVD products according to the International Patent Classification (IPC) classes covering biology topics. The data are transformed to a common XML format and combined into one SRS dataset.
http://srs.ebi.ac.uk/srsbin/cgi-bin/wgetz?-page+query+-libList+PATABS

Patent_DNA - a library of patented DNA sequences from the European Patent Office in the public domain.
http://srs.ebi.ac.uk/srs6bin/cgi-bin/wgetz?-page+LibInfo+-id+1rbNl1KbLkV+-lib+PATENT_DNA

Patent_prt - a library of patented protein sequence from the European Patent Office in the public domain.
http://srs.ebi.ac.uk/srs6bin/cgi-bin/wgetz?-page+LibInfo+-id+1rbNl1KbLi1+-lib+PATENT_PRT

USPO_prt - a library of patented protein sequence from the American Patent Office in the public domain
http://srs.ebi.ac.uk/srs6bin/cgi-bin/wgetz?-page+LibInfo+-id+1rbNl1KbLnF+-lib+USPO_PRT

Database, maintained by the United States Patent and Trademark Office.
http://www.uspto.gov/patft/index.html