Dcard, Inc.
14Patents
0Active
14Granted
25Portfolio score
Filing activity: Apr 9, 1999 → Jul 9, 2004
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6311893A | Optical data access system with data card reader having a single rotational moving pickup head | Physics | 14 | Expired |
| US7334733B2 | Data access device using rotational head to access data stored in data strips and data arc segments or data circles | Physics | 5 | Expired |
| US6775080B2 | Data access device implemented with open and closed control loops to access data stored in discrete stepwise segments | Physics | 5 | Expired |
| US6417980B1 | Magnetic data card servo writer | Physics | 4 | Expired |
| US6728059B2 | Magnetic data card servo writer | Physics | 4 | Expired |
| US6934098B2 | Data card with a full circular track for alignment and amplitude calibration | Physics | 4 | Expired |
| US6588671B2 | Positioning of a recording head for a data storage device | Physics | 3 | Expired |
| US6502755B2 | Optical data storage card | Physics | 3 | Expired |
| US6339569B1 | Optical data card servo writer | Physics | 2 | Expired |
| US6307709A | Magnetic data storage card | Physics | 2 | Expired |
| US7336569B2 | Optical disk tracking servo circuit enabled to compensate for non-continuous track segments or prolonged defect | Physics | 2 | Expired |
| US7185814B2 | Layer structure and method of manufacture for optical memory strip (OMS) | Physics | 1 | Expired |
| US6499659B1 | Pulse shaping for a transformer coupled read/write recording device | Physics | 1 | Expired |
| US6545831B1 | Servo-sector arrangement over several data arcs for a rotational head data recording and retrieving system | Physics | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.