Yahoo patent applications published on 20 January 2011

4 US patent applications published on 20 January 2011 and assigned to Yahoo

1 20110016127 Hierarchy of Servers for Query Processing of Column Chunks in a Distributed Column Chunk Data Store
2 20110016065 EFFICIENT ALGORITHM FOR PAIRWISE PREFERENCE LEARNING
3 20110015999 SYSTEM AND METHOD FOR UTILIZING A LATTICE STORAGE STRUCTURE IN AN ADVERTISEMENT SERVING SYSTEM
4 20110015991 KEYWORD SET AND TARGET AUDIENCE PROFILE GENERALIZATION TECHNIQUES