DPHI Acquisitions, Inc.
111Patents
7Active
111Granted
38Portfolio score
Filing activity: Sep 10, 1999 → Jul 24, 2008 · 7 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7110982B2 | Secure access method and system | Physics | 94 | Expired |
| US6636966B1 | Digital rights management within an embedded storage device | Physics | 78 | Expired |
| US6823398B1 | File system management embedded in a storage device | Emerging Cross-Sectional Technologies | 73 | Expired |
| US6980652B1 | Combination mastered and writeable medium and use in electronic internet appliance | Physics | 42 | Expired |
| US7191153B1 | Content distribution method and apparatus | Physics | 36 | Expired |
| US7549044B2 | Block-level storage device with content security | Electricity | 35 | Expired |
| US7196979B2 | Calibration storage methods for a digital focus and tracking servo system with calibration | Physics | 32 | Expired |
| US7310821B2 | Host certification method and system | Physics | 31 | Expired |
| US6631359B1 | Writeable medium access control using a medium writeable area | Physics | 30 | Expired |
| US6754151B2 | BEMF timing system | Physics | 17 | Expired |
| US7051054B1 | Method and apparatus for emulating read/write file system on a write-once storage disk | Emerging Cross-Sectional Technologies | 15 | Expired |
| US6809995B2 | Digital focus and tracking servo system | Physics | 15 | Expired |
| US6687215B1 | Low profile and medium protecting cartridge assembly | Physics | 13 | Expired |
| US7020054B2 | Digital servo system with biased feed-forward | Physics | 13 | Expired |
| US6970403B2 | Calibration of tracking error signal offset in a tracking servo system | Physics | 12 | Expired |
| US6781929B2 | Digital tracking servo system with multi-track seek | Physics | 12 | Expired |
| US6813226B2 | Calibration of a focus sum threshold in a focus servo system | Physics | 11 | Expired |
| US6906985B2 | Calibration of tracking error signal gain in a tracking servo system | Physics | 11 | Expired |
| US6965547B2 | Tracking and focus servo system with error signal inverse non-linearity calibration | Physics | 11 | Expired |
| US6914724B2 | Micro lens and method and apparatus for fabricating | Physics | 10 | Expired |
| US7092322B2 | Calibration of focus error signal offset in a focus servo system | Physics | 10 | Expired |
| US6632310B2 | Disk drive actuator and method of making same | Emerging Cross-Sectional Technologies | 9 | Expired |
| US6958957B2 | Digital tracking and focus servo system with TES to FES crosstalk calibration | Physics | 9 | Expired |
| US7023776B2 | Calibration initiation methods for a tracking and focus servo system | Physics | 9 | Expired |
| US6904007B2 | Digital servo system with loop gain calibration | Physics | 8 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.