Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE42011 | Machine-readable optical disc with reading-inhibit agent | Philip E. Rollhaus, John R. Powell, Eric J. Carlson, Daniel J. Ehntholt, Irwin C. Winkler +1 more | 2010-12-28 |
| 6434109 | Machine-readable optical disc with reading-inhibit agent | Philip E. Rollhaus, John R. Powell, Eric J. Carlson, Daniel J. Ehntholt, Irwin C. Winkler +1 more | 2002-08-13 |
| 6343063 | Machine-readable optical disc with reading-inhibit agent | Philip E. Rollhaus, John R. Powell, Eric J. Carlson, Daniel J. Ehntholt, Irwin C. Winkler +1 more | 2002-01-29 |
| 6011772 | Machine-readable optical disc with reading-inhibit agent | Philip E. Rollhaus, John R. Powell, Eric J. Carlson, Daniel J. Ehntholt, Irwin C. Winkler +1 more | 2000-01-04 |