General and Introductory

UK Patent Office Web Site
The United Kingdom Patent Office is the official body for the granting of patents and for the registration of designs and trade marks in the UK. What is the difference between patents, designs, trade marks and copyright? The answer to that and more can be found here.
http://www.patent.gov.uk/snewcg/

Patent Cooperation Treaty (PCT) System
The worldwide system for simplified multiple filing of patent applications. The Treaty makes it possible to seek patent protection for an invention simultaneously in each of a large number of countries by filing an "international" patent application.
http://www.wipo.int/eng/newindex/pct.htm

Patent and Trademark Information
Frequently Asked Questions about Patents and Trademarks. Links to web sites with intellectual property information.
http://mahogany.lib.utexas.edu/
Libs/ENG/uspat.html

Patent Searching Tutorial
This Patent Searching Tutorial teaches the basics of patent searching. The specifics were written for patrons of the Patent and Trademark Depository at the Richard W. McKinney Engineering Library, the University of Texas at Austin.
http://www.lib.utexas.edu/Libs/
ENG/PTUT/ptut.html

Trademark Searching Tutorial
This Trademark Searching Tutorial teaches the basics of trademark searching. The specifics were written for patrons of the Patent and Trademark Depository at the Richard W. McKinney Engineering Library, the University of Texas at Austin.
http://www.lib.utexas.edu/Libs/
ENG/TTUT/ttut.html

Online Databases

DNA/RNA Patent Database
Allows free public access to the full text and analysis of all DNA patents issued by the United States Patent and Trademark Office (PTO).
http://208.201.146.119/

Attorneys

European Patent Attorneys database
http://www.european-patent-office.org/
reps/search.html

Classifications

Index to All U.S. Patent Classes
http://metalab.unc.edu/patents/classes.html

International Classification
http://classifications.wipo.int/
eng/main.htm

Metasites