Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5138594 | Reducing amplitude variations of optical disk readback signals and increasing reliability of track-crossing counts | Alan A. Fennema | 1992-08-11 |
| 5038333 | Positioning systems including reliable track crossing detection for high speed relative motions | William W. Chow, Alan A. Fennema, Ian E. Henderson, Ronald James Kadlec, Spencer D. Roberts | 1991-08-06 |
| 4998233 | Acquiring focus in optical systems using a focus error signal and a laser drive signal | Joseph H. DiMatteo, Alan A. Fennema, Julian Lewkowicz | 1991-03-05 |