1-Click

[6] Calveley cited as prior art an earlier e-commerce patent and the Digicash electronic cash system.

In November 2007, Amazon responded by amending the broadest claims (1 and 11) to restrict them to a shopping cart model of commerce.

Amazon filed a patent infringement lawsuit in October 1999 in response to Barnes & Noble's 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.

[20] Barnes & Noble had developed a way to design around the patent by requiring shoppers to make a second click to confirm their purchase.