uspto.gov seems to be infringing also...
When researching the Infonautics patents I was sent to the following link which begins:
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http://patimg2.uspto.gov/.piw?Docid=...ft.usp to.gov
This link contains a reference to 'homeurl', which identifies the page from which the link was clicked. This would appear to be somewhat similar to the technique that Amazon is being sued for using.
2hp