Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7336569 | Optical disk tracking servo circuit enabled to compensate for non-continuous track segments or prolonged defect | Jeffrey Liu | 2008-02-26 |
| 7334733 | Data access device using rotational head to access data stored in data strips and data arc segments or data circles | Jeffrey Liu | 2008-02-26 |
| 7185814 | Layer structure and method of manufacture for optical memory strip (OMS) | Jeffrey Liu | 2007-03-06 |
| 6934098 | Data card with a full circular track for alignment and amplitude calibration | Jeffrey Liu, Shand-Ling Mao | 2005-08-23 |
| 6775080 | Data access device implemented with open and closed control loops to access data stored in discrete stepwise segments | Jeffrey Liu | 2004-08-10 |
| 6728059 | Magnetic data card servo writer | Jeffrey Liu | 2004-04-27 |
| 6588671 | Positioning of a recording head for a data storage device | Jeffrey Liu, Shand-Ling Mao | 2003-07-08 |
| 6545831 | Servo-sector arrangement over several data arcs for a rotational head data recording and retrieving system | — | 2003-04-08 |
| 6502755 | Optical data storage card | Jeffrey Liu | 2003-01-07 |
| 6499659 | Pulse shaping for a transformer coupled read/write recording device | Ranvir Koshal | 2002-12-31 |
| 6417980 | Magnetic data card servo writer | Jeffrey Liu | 2002-07-09 |
| 6339569 | Optical data card servo writer | Jeffrey Liu | 2002-01-15 |
| 6311893 | Optical data access system with data card reader having a single rotational moving pickup head | Jeffrey Liu | 2001-11-06 |
| 6307709 | Magnetic data storage card | Jeffrey Liu | 2001-10-23 |
| 5121280 | Zone servo sector format alignment scheme for servo and spindle motor control | — | 1992-06-09 |
| 4399476 | Suspension assembly for magnetic head | — | 1983-08-16 |
| 4355339 | Transducer carriage assembly | Donald J. Wanek | 1982-10-19 |
| 4291350 | Spring suspension for magnetic transducer | Donald J. Wanek | 1981-09-22 |
| 4191980 | Transducers with tapered edge profiles and assembly thereof | Ronald J. Maurine, Donald J. Wanek | 1980-03-04 |