Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4239560 | Open tube aluminum oxide disc diffusion | Mike F. Chang, David K. Hartman, Alfred Roesch, Henri B. Assalit | 1980-12-16 |
| 4188245 | Selective open tube aluminum diffusion | Mike F. Chang, Alfred Roesch | 1980-02-12 |