Today, the United States Patent and Trademark Office (USPTO) issued an office action, which confirmed the patentability of claims 6 to 10 of the Amazon 1-Click patent, US 5,960,411. The patent examiner, however, rejected claims 1 to 5 and 11 to 15.  Amazon now has up to six months to amend the rejected claims to overcome the examiner's rejection, provide arguments to demonstrate that the examiner is in error and/or provide evidence to demonstrate the patentability of their claims.  During this period, the entire patent is still considered valid under US patent law.
The USPTO is reconsidering the patentability of the claims due to a request for reexamination filed by New Zealander Peter Calveley. Mr. Calveley used internet archives to show that defunct company Digi Cash used a similar technique prior to Amazon.  Despite costing a substantial sum of cash and requiring donations to prepare and file the request for reexamination, Calveley said he did it as a game and hopes that his success inspires others to play the same game.
"One Click" shopping is an ecommerce technique, which allows a customer to purchase products via the Internet without repeatedly entering personal information such as name and address.  At the time it was introduced it eased the frustration of on-line shopping.  
Amazon filed the patent application for 1-click shopping in early 1997 and was granted the patent in September 1999.  23 days later Amazon sued rival Barnes & Noble for alleged infringement by its "Express Lane" ordering which was introduced in 1998.  In December 1999 Amazon won an interim injunction against Barnes & Noble but the USA Court of Appeals for the Federal Circuit lifted this injunction in February 2001.  The parties then settled their dispute for undisclosed terms.  Amazon has since successfully licensed the technique to other e-sellers such as Apple.

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USPTO partially confirms validity of Amazon "1-click patent"