Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5343022 | Pyrolytic boron nitride heating unit | Timothy J. Hejl | 1994-08-30 |
| 5277934 | Method for protecting a graphite chuck for a starter filament in the manufacture of polycrystalline silicon | John B. Hedge, Paul J. Walsh | 1994-01-11 |