Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4747040 | Dual operating system computer | David Blanset, David A. Butterfield, Kenneth M. Keverian, Gerald Popek | 1988-05-24 |
| 4744048 | Display context switching arrangement | David Blanset, David A. Butterfield, Kenneth M. Keverian, Gerald Popek | 1988-05-10 |