Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4997789 | Aluminum contact etch mask and etchstop for tungsten etchback | Stephen A. Keller, Piper A. Spry, Martha S. Adams | 1991-03-05 |
| 4920072 | Method of forming metal interconnects | Stephen A. Keller, Piper A. Spry, Martha S. Adams | 1990-04-24 |