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Patent Database required, which one to use?

I am planning to subscribe to a commercial patent database service.

Do I need that and which one do you recommend?

Management summary: I am using only two sources of patent publications: the official databases of the respective patent offices (available online) and free online databases. I have used several commer ... [read more]
Thanks for sharing. I find that the evaluation guide provided here is useful for me, as a patent engineer, to carry out prior art searches efficiently in a systematic manner.  
I found depatisnet useful for the first two type of searches (freedom to operate and novelty or patentability studies). The expert mode provides a query language, which allows you to customize the que ... [read more]
If you are looking for commercial patent database services, I would suggest Patmonitor and Backward/Forward search tool of IPLawyer. They can served me well.