20. The system of claim 18 , wherein: the output device is a display; and the processor is further configured to cause the display to display the search results.
18. A system for identifying products potentially infringing a patent, the system comprising: a processor; an input device coupled to the processor, the input device being capable of providing information to the processor; and an output device coupled to the processor; wherein the processor is configured to receive through the input device data sufficient to obtain text of the patent; obtain the text of the patent; identify a plurality of key terms of a first claim of the patent by performing steps comprising: determining frequencies of occurrence within the text of the patent of each word of a plurality of words in a claim of the patent to obtain a plurality of first frequencies, determining frequencies of occurrence of said each word in a neutral text unrelated to the patent and to technology of the patent to obtain a plurality of second frequencies, for said each word, calculating a ratio of (1) the first frequency of the plurality of first frequencies associated with said each word to (2) the second frequency of the plurality of second frequencies associated with said each word, thereby obtaining a plurality of ratios, a ratio of the plurality of ratios per said each word, and comparing each ratio of the plurality of ratios to a first parameter to obtain a plurality of key terms, each key term of the plurality of key terms corresponding to a ratio of the plurality of ratios that exceeds the first parameter; formulate at least one query to search for data items that include the key terms; launch the at least one query; receive search results responsive to the at least one query; and organize the search results according to a criterion of relevance to the patent.