Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5128913 | Acquiring focus in an optical system using a soft focus acquiring system | Alan A. Fennema | 1992-07-07 |
| 5038333 | Positioning systems including reliable track crossing detection for high speed relative motions | William W. Chow, Alan A. Fennema, Benjamin C. Fiorino, Ian E. Henderson, Ronald James Kadlec | 1991-08-06 |
| 4914725 | Transducer positioning servo mechanisms employing digital and analog circuits | Karl A. Belser, Paul J. Dounn, Ian E. Henderson, Ronald James Kadlec | 1990-04-03 |