- Delphion
http://www.delphion.com/
Free patent searches of US, EPO, and WIPO data, including web access to scanned images of most indexed documents. U.S. data begins in 1971.
- ShouldExist
http://www.shouldexist.org/
Designed to assist the free exchange and discussion of good ideas. Good for prospective inventors to check out regularly and for people to post their desires for products that don't exist yet.
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