The parties in a New Jersey federal suit over whether a travel search engine infringes a patent for quote-generating software are wrestling with a relatively new question in intellectual property law: When is a technology’s function too abstract to patent?

Plaintiff Source Search Technologies (SST) sued Kayak Software Corporation, which owns the travel search website Kayak.com, in the U.S. District Court for the District of New Jersey, alleging it is infringing SST’s ’328 patent for “a method and system that allows a central computer to filter requests for quotes, and to interface to various vendor computers to obtain and forward such quotes to potential buyers of goods and services,” according to the amended complaint filed in 2013.

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