Professional Patent Search

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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.