Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9076164 | Method and apparatus for performing targeted advertising in documents | Walter Chang | 2015-07-07 |
| 8504564 | Semantic analysis of documents to rank terms | Walter Chang | 2013-08-06 |
| 7873640 | Semantic analysis documents to rank terms | Walter Chang | 2011-01-18 |
| 7644052 | System and method of building and using hierarchical knowledge structures | Walter Chang | 2010-01-05 |
| 7580918 | System and method of efficiently representing and searching directed acyclic graph structures in databases | Walter Chang, Arun Narasimha Swami | 2009-08-25 |