It’s a well-known fact that Google is planning to offer users in the United States wireless access at low, and even inexistent, prices and that the money to finance the project will come from ads.

But up until now, nobody knew Google’s exact method to achieve this goal.

CNET News’ Dawn Kawamoto seems to have found Google’s secret by studying three patent applications filed by the Mountain View company in 2004 and published this month.

Of the three patents, the most interesting one is number 20060058019, which seeks to develop a system for dynamically modifying the appearance of browser screens on a client device when connecting to a wireless access point.

What does this mean? Imagine that you are somewhere in the US and you really have to send an e-mail. You connect your laptop to a wireless access point, for which you pay nothing, and in a few minutes, the message is sent. The only problem, if you can call it a problem, is that instead of seeing ads in the browser’s web pages, they are embedded in the application itself.

Google told CNET that the patents are not a guarantee that the company will go in this specific direction with WiFi technology.

Visit CNET News for more information.