Professional Patent Search
Professional specialists in patent, trademark, and literature, searching - international service.
Community Of Science Patent Search
Search for patents by state or by classification.
Derwent
U.K. based company.
MicroPatent
Services are ordered over the internet.
PATSCAN Patent & Trademark Searching - University of British Columbia
A trademark or patent search will be made using the Canadian, U.S., or International patent classification systems, plus any relevant technical terms.
Woolcott And Company
Since 1961, Woolcott & Co. has specialized in patent, trademark and literature searching, as well as technical translations. They offer a lot of online search services in all IP areas in 24 hours.
Patent Complete
Patent search company that specializes in a high-tech patent search with advanced expertise in biotechnology, physics, engineering, and other sciences.
Article One Partners
They are in the business of helping people find prior art. Article One Partners uses the power of the global online community to research evidence that relates to the claims of novelty of selected patents.