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I want a web site to search for a patent classification by entering the classification code .

For example , if I enter G02 then I have to get optics , G02C5/14 -> Side members like that.. Is any site available like that . (it may be either US classification codes or International classification codes )

I found some site who indexed classification , but don't provide a search system..

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Not sure if this is what you are looking for, but the USPTO provides a classification structure that you can navigate through here ==> http://www.uspto.gov/web/patents/classification/selectnumwithtitle.htm

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You could do a google search which would look like:

g02c 5/14 site:www.uspto.gov/web/patents/classification

and there is a USPTO page similar to one linked in previous answer: http://www.uspto.gov/web/patents/classification/ but it doesn't have a search system.

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