CTRC (University of Colorado)
http://www-libraries.colorado.edu/ps/
ids/ctrc/frontpage.htm

Derwent Scientific and Patent Information
http://www.derwent.co.uk/

F.Y.I.
http://colapublib.org/fyi

ISC (Information Specialties Corporation)
http://www.informationspecialties.com/

ISTA (Japan)
http://www.intlscience.com/

Infocus Research Services
http://www.infocus-research.com

Patent Express (British Library)
http://portico.bl.uk/

PATENTEC
http://www.patentec.com/

Polyresearch Service
http://www.polyresearch.com/

Penco
http://www.penco-info.com

Reedfax
http://www.reedfax.com/

SEEK Trademark Center
http://www.seekinfo.com/