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See links below to U.S. Patent & Trademark Office for treasure trove of info.

2007-04-19 16:41:31 · answer #1 · answered by randomopin 3 · 0 0

There are many sources for patent search however if you want a list, let alone statistics, you will require more space than allowed in the answer block.

This website lists a 'few' of the common categories if you want to get a feel for it: http://www.free-patent-search.org/

2007-04-17 10:21:23 · answer #2 · answered by Caretaker 7 · 0 0

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