Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6883747 | Projectile guidance with accelerometers and a GPS receiver | Joseph A. Ratkovic, Robert J. Buchler | 2005-04-26 |
| 6573486 | Projectile guidance with accelerometers and a GPS receiver | Joseph A. Ratkovic, Samuel N. Fersht, Robert D. Curby, David Hsu | 2003-06-03 |
| 6249745 | Gravity vector compensation system | David Hsu | 2001-06-19 |
| 5543804 | Navagation apparatus with improved attitude determination | Robert J. Buchler, David Hsu | 1996-08-06 |