Amount of patents

[Student]

Hello,

I am a student and need to do a patent research for my university. I found this site and am fascinated about its structure compared to the usual patent databases. But as far as I can see there are only about 8 million patents here. Espacenet has about 72 million patents.
Where are the other 64 million patents? Are the 8 million the latest ones or are they randomly chosen? What I mean is: Are my results representative if I want to describe the development of the last 30 years? Or can I just describe the last 10 years?

Thank you for your help. This page is great! :-)

[smatthes]

I am currently out of the office and will respond to your e-mail as soon as possible upon my return, Monday, October 10, 2011.

If you have an urgent matter please contact [hidden email] and someone will assist you.

Kind regards,
Sandy Matthes
Armstrong Teasdale LLP
[hidden email]
[hidden email]






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[Christophe]

Hello,

PATENTSCOPE does not contain all national patent collections. Details on the coverage can be found at http://www.wipo.int/patentscope/search/en/help/data_coverage.jsf.

The US, Japan, China national collections are notably not yet included. However, the number of patents loaded in PATENTSCOPE increases steadily every year and we hope to get a coverage comparable to the great coverage of ESPACENET in the next five years.

Thanks anyway for the positive feedback, I will convey it to the other members of the team,

Christophe