Nowdays, more and more companies are using patent map to make their market strategy.
In this blog I will share some useful informations about patent map:
http://en.wikipedia.org/wiki/Patent_map ,you must want to know what is a patent map, for this I think no other site will give a more clearly answer than this, it is really a good site.
http://www.scribd.com/doc/467546/patent-map-JPO ,Patent Map is originated from Japan, Japan Patent Office had published a guide book for practical use of "Patent Map for Each Technology Field", I think it is very good, you could read it if you are interested.
http://www.patent-i.com/wiki/en/func_map.html this site introduces how to use the Patent Map function.
http://www.giveawayoftheday.com/patent+map/ : this site gives many patent map tools. You could download them if you like.
http://www.patsnap.com/ : this online tool provides Geography Map and Citation Map service. Very convenient to use.
Ok, that's all for today, Patent map is very important for cutting-edge company to make market strategies, who pays more attention to it will stand out in the strong competition.