Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5758288 | Signal time of arrival position determining method for calculating cellular telephone billing charges | Michael Dunn, Douglas O. Reudink, Martin Feuerstein, Ronald E. Foerster, Ching Chuang +1 more | 1998-05-26 |
| 5600706 | Method and system for determining the position of a mobile receiver | Michael Dunn, Douglas O. Reudink, Martin Feuerstein, Ronald E. Foerster, Ching Chuang +1 more | 1997-02-04 |
| 5295180 | Cellular telephone zone system | Dino J. Vendetti, Ching Chuang, Elliott H. Drucker, Michael Dunn, Ronald E. Foerster +1 more | 1994-03-15 |
| 5140198 | Image canceling mixer circuit on an integrated circuit chip | Carl R. Battjes | 1992-08-18 |