Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4724495 | Digital formatter, controller, and head assembly for video disk recording system, and method | David J. Hedberg, Edward P. Denta, Jr. | 1988-02-09 |
| 4577240 | Multiple zone multiple disk video recording system | David J. Hedberg, Edward P. Denta, Jr. | 1986-03-18 |