Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6388615 | Micro cell architecture for mobile user tracking communication system | Donald C. D. Chang, Ying Feria, Alan Cha, Ming U. Chang, Frank A. Hagen +1 more | 2002-05-14 |
| 6380893 | Ground-based, wavefront-projection beamformer for a stratospheric communications platform | Donald C. D. Chang, Kar W. Yung, Frank A. Hagen | 2002-04-30 |