I've never seen a review of patent searching services.
I can't opine on what the industry does...only on what I do (for simple mechanical searches). I use a patent searcher in DC who does the physical side (determines appropriate classification and then digs through the PTO paper files...old school). He does it very economically (again, simple mechanical applications) and sends me the results (usually the 5-10 best patents he finds) by email within a couple weeks. If he doesn't knock it out I usually spend at least a little while doing my own keyword search supplementing his results.
I guess we still use old school for simple mechanical 'cause it is so economical (and we can pass the savings on to our clients).
-- Steve
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