• Method and apparatus for measuring similarity among electronic documents. Inventors: Michael Palmer, Gordon Sun and Hongyuan Zha, US patent 6,990,628.

• Associating documents with classifications and ranking documents based on classification weights. Inventors: Hongyuan Zha and Sean Suchter, US patent 7,028,027.

• Using network traffic logs for search enhancement. Inventors: Arkady Borkovsky, Douglas M. Cook, Jean-Marc Langlois, Tomi Poutanen, and Hongyuan Zha , US patent 7,398,271.

• Learning retrieval functions incorporating query differentiation for information retrieval. Inventors: Gordon Sun, Zhaohui Zheng and Hongyuan Zha. US patent, pending.

• Regression framework for learning ranking functions using relative preferences. Inventors: Zhaohui Zheng, Hongyuan Zha, Keke Chen and Gordon Sun, US patent, pending.

• System and method for learning balanced relevance functions from expert and user judgments. Inventors: Keke Chen, Ya Zhang, Zhaohui Zheng, Hongyuan Zha and Gordon Sun. US patent, pending.