See http://www.bitlaw.com/source/35usc/101.html and http://www.bitlaw.com/source/35usc/102.html where you find the relevant parts. The main difference between the EPT (European patent treaty) and US patent law is that they (the US) do not require industrial application. 102 also tells you about the 12 month prior to filing for relevant prior art.
Worth noting is that in both US and EU patent examiners use limited sources to search for prior art. They logically miss a lot of information we typically know about.
Also note that web pages are not acceptable most of the time as it cannot be garantueed to not have been changed etc.