Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871919 | Electron beam lithography alignment using electric field changes to achieve registration | Thomas P. Donohue, George A. Sai-Halasz | 1989-10-03 |
| 4843330 | Electron beam contactless testing system with grid bias switching | Steven D. Golladay, Hans C. Pfeiffer | 1989-06-27 |