Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5656514 | Method for making heterojunction bipolar transistor with self-aligned retrograde emitter profile | David C. Ahlgren, Jack O. Chu, Martin Revitz, Paul A. Ronsheim, Mary J. Saccamango | 1997-08-12 |
| 5266505 | Image reversal process for self-aligned implants in planar epitaxial-base bipolar transistors | David C. Ahlgren, Shao-fu Sanford Chu, Mary J. Saccamango, Tze-Chiang Chen | 1993-11-30 |