Science Technology Internet resources:Patents

Patents:

The USPTO's PATFT searches and serves over 7,000,000 patents

http://patft.uspto.gov

Esp@cenet

http://ep.espacenet.com

The European Patent Office's (EPO) patent search engine

http://patft.uspto.gov/ 

SurfIP

http://www.surfip.gov.sg/

 

CIPO

http://patents.ic.gc.ca/

 

Patent Analysis

http://www.patentanalysis.com/

 

Google Patents

http://www.google.com/patents

 

Freepatentsonline

http://www.freepatentsonline.com/search.html

 

Patent Lens

http://www.patentlens.net/

 

WIPO Reformed IPC

http://www.wipo.int/classifications/ipc/ipc8/?lang=en