1-Click, also called one-click or one-click buying, is the technique of allowing customers to make online purchases with a single click, with the payment information needed to complete the purchase having been entered by the user previously. More particularly, it allows an online shopper using an internet marketplace to purchase an item without having to use shopping cart software. Instead of manually inputting billing and shipping information for a purchase, a user can use one-click buying to use a predefined address and credit card number to purchase one or more items.
On May 12, 2006, the USPTO ordered a reexamination of the "One-Click" patent, based on a request filed by Peter Calveley. Calveley cited as prior art an earlier e-commerce patent and the Digicash electronic cash system.
On October 9, 2007, the USPTO issued an office action in the reexamination which confirmed the patentability of claims 6 to 10 of the patent. The patent examiner, however, rejected claims 1 to 5 and 11 to 26. In November 2007, Amazon responded by amending the broadest claims (1 and 11) to restrict them to a shopping cart model of commerce. They have also submitted several hundred references for the examiner to consider. In March 2010, the reexamined and amended patent was allowed.
In Europe, a patent application on 1-Click ordering was filed with the European Patent Office but denied A gift-ordering patent was granted in 2003, but revoked in 2007. Contrary to this EPO statement, this patent appears to be in force in DE/IT/FR and was recently revoked in GB 
In Canada, the Federal Court of Canada held that the One click patent could not be rejected as a pure business method since it had a physical effect. The Court remanded the application to the Canadian patent office for a reexamination.
Barnes & Noble
Amazon filed a patent infringement lawsuit in October 1999 in response to Barnes & Noble offering a 1-Click ordering option called "Express Lane." After reviewing the evidence, a judge issued a preliminary injunction ordering Barnes & Noble to stop offering Express Lane until the case was settled. Barnes & Noble had developed a way to design around the patent by requiring shoppers to make a second click to confirm their purchase. The lawsuit was settled in 2002. The terms of the settlement, including whether or not Barnes & Noble took a license to the patent or paid any money to Amazon, were not disclosed.
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