Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7890052 | Stratospheric-based communication system for mobile users using additional phased array elements for interference rejection | Donald C. D. Chang, Alan Cha, Frank A. Hagen | 2011-02-15 |
| 7317916 | Stratospheric-based communication system for mobile users using additional phased array elements for interference rejection | Donald C. D. Chang, Alan Cha, Frank A. Hagen | 2008-01-08 |
| 7254365 | Antenna directivity estimator for a reconfigurable antenna | — | 2007-08-07 |