Interactive interface for viewing retrieval results
Marti Hearst and Chandu A. Karadi
U.S. Patent 6,297,824. October 2001

Interactive interface for specifying searches
Marti Hearst
U.S. Patent 6,223,145. April 2001

Method for learning to infer the topical content of documents based upon their lexical content
Eric Saund and Marti Hearst
U.S. Patent 5,687,364. November 1997

Method and apparatus for inferring the topical content of a document based upon its lexical content without supervision
Eric Saund and Marti Hearst
U.S. Patent 5,659,766. August 1997