Patents by Inventor David Edward DeHann

David Edward DeHann has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Using query expression signatures in view matching
    Patent number: 7599925
    Abstract: A system for optimizing queries against a database is described. The system comprises a memo structure that encodes a plurality of query expressions. The system also includes a signature mechanism that enables an assignment of the query expressions into equivalence classes. Methods of using such a system are additionally provided.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: October 6, 2009
    Assignee: Microsoft Corporation
    Inventors: Per-Ake Larson, David Edward DeHann, Jingren Zhou