Issued Patents All Time
Showing 26–35 of 35 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6317505 | Image marking with error correction | Robert D. Powell | 2001-11-13 |
| 6311163 | Prescription-controlled data collection system and method | David M. Sheehan, Patrick J. Fitzgerald | 2001-10-30 |
| 6307950 | Methods and systems for embedding data in images | Robert D. Powell | 2001-10-23 |
| 6301369 | Image marking to permit later identification | Robert D. Powell | 2001-10-09 |
| 6137892 | Data hiding based on neighborhood attributes | Robert D. Powell | 2000-10-24 |
| 6072888 | Method for image encoding | Robert D. Powell | 2000-06-06 |
| 5930377 | Method for image encoding | Robert D. Powell | 1999-07-27 |
| 5809160 | Method for encoding auxiliary data within a source signal | Robert D. Powell | 1998-09-15 |
| D392202 | Combined transmitter and receiver for a portable computer alarm | — | 1998-03-17 |
| 5721788 | Method and system for digital image signatures | Robert D. Powell | 1998-02-24 |